2021/04/17
Improving Navigation Continuity Using Parallel Cascade Identification
By Umar Iqbal, Jacques Georgy, Michael J. Korenberg, and Aboelmagd Noureldin
To reliably navigate with fewer than four satellites, GPS pseudoranges needs to be augmented with measurements from other sensors, such as a reduced inertial sensor system or RISS. What is the best way to combine the RISS measurements with the GPS measurements? The classic approach is to integrate the measurements in a conventional tightly coupled Kalman filter. But in this month’s column, we look at how a mathematical procedure called parallel case identification can improve the Kalman filter’s job, when navigating with three, two, one, or even no GPS satellites.
INNOVATION INSIGHTS by Richard Langley
THREE, TWO, ONE, ZERO! Can you still navigate with just a GPS receiver when the number of tracked GPS satellites drops from four to none? As we know, pseu- doranges from a minimum of four satellites, preferably well spaced out in the sky, are required for three-dimensional positioning. That’s because there are four unknowns to estimate: the three position coordinates (latitude, longitude, and height) and the offset of the receiver clock from GPS System Time. If we had a stable clock in the receiver, then we could hold the clock offset constant and have 3D navigation with just three satellites. But for every 3 nanoseconds of clock drift, we will have about 1 meter of pseudorange error, which will lead to several meters of position error depend- ing on the receiver-satellite geometry. On the other hand, we could hold the height coor- dinate constant (viable for navigation over slowly changing topography or at sea) and estimate the horizontal coordinates and the receiver clock offset. So far, so good.
What if the number of tracked satellites then drops to two? We can now only esti- mate two unknowns. They could be the two horizontal coordinates, if we hold both the receiver clock offset and the height fixed. Any errors in those fixed values will propagate into the estimated horizontal coordinates but the resulting position errors might still be acceptable. Instead of holding the clock offset
fixed, we could assume a constant heading and compute the position along the assumed trajectory. However, navigation will rapidly deteriorate as soon as we make the first turn. And one satellite? We would have to make assumptions about the vehicle trajectory, the height, and the clock offset, with likely very poor results. And with no satellites? We might be able to navigate over a short period of time by “dead reckoning,” assuming a constant trajectory and speed, but the resulting positions will be educated guesses at best.
Clearly, if we want to reliably navigate with fewer than four satellites we need to augment the GPS pseudoranges with measurements from some other sensors. A common approach is to use inertial measurement units or IMUs. A complete IMU consists of three accelerometers and three gyroscopes, and small, cost-effective microelectromechanical IMUs are readily available. For land navigation, however, it can be advantageous to use a reduced inertial sensor system or RISS, consisting of one single-axis gyroscope, two accelerometers, and the vehicle speedometer. We can also make use of GPS pseudorange rates along with the pseudoranges.
But what is the best way to combine the RISS measurements with the GPS measurements? The classic approach is to integrate the measurements in a conventional tightly coupled Kalman filter. But in this month’s column, we look at how a mathematical procedure called parallel cascade identification can improve the Kalman filter’s job, when navigating with three, two, or even one GPS satellite.
The Global Positioning System meets the requirements for numerous navigational applications when there is direct line-of-sight (LOS) to four or more GPS satellites. Vehicular navigation systems and personal positioning systems may suffer from satellite signal blockage as LOS to at least four satellites may not be readily available when operating in urban landscapes with high buildings, underpasses, and tunnels, or in the countryside with thick forested areas. In such environments, a typical GPS receiver will have difficulties attaining and maintaining signal tracking, which causes GPS outages resulting in degraded or non-existent positioning information. Due to these well-known limitations of GPS, multi-sensor system integration is often employed. By integrating GPS with complementary motion sensors, a solution can be obtained that is often more accurate than that of GPS alone.
Microelectromechanical systems (MEMS) inertial sensors have enabled production of lower-cost and smaller-size inertial measurement units (IMUs) with little power consumption. A complete IMU is composed of three accelerometers and three gyroscopes. These MEMS sensors have composite error characteristics that are stochastic in nature and difficult to model. In traditional low-cost MEMS-based IMU/GPS integration, a few minutes of degraded GPS signals can cause position errors, which can reach several hundred meters. For full 3D land vehicle navigation, we had earlier proposed a low-cost MEMS-based reduced inertial sensor system (RISS) based on only one single-axis gyroscope, two accelerometers, and the vehicle odometer, and we have integrated this system with GPS. RISS mitigates several error sources in the full-IMU solution; moreover, RISS reduces system cost further due to the use of fewer sensors. Another enhancement can be achieved by using tightly coupled integration, which can provide GPS aiding for a navigation solution when the number of visible satellites is three or lower, removing the foremost requirement of loosely coupled integration, which is visibility of at least four satellites. GPS aiding during limited GPS satellite availability can improve the operation of the navigation system for tightly coupled systems. Thus, in our reseach, a Kalman filter (KF) is used to integrate low-cost MEMS-based RISS with GPS in a tightly coupled scheme.
The KF employed in tightly coupled RISS/GPS integration utilizes pseudoranges and pseudorange rates measured by the GPS receiver. The accuracy of the position estimates is highly dependent on the accuracy of the range measurements. The tightly coupled solutions presented in the literature assume that the pseudorange measurement, after correcting for ionospheric and tropospheric delays, satellite clock errors, and ephemeris errors, only have errors due to the receiver clock and white noise. These latter two are the only errors modeled inside the measurement model in the tightly coupled solutions presented in the literature. Experimental investigation of the GPS pseudoranges for vehicle trajectories in different areas and for different scenarios showed that, in addition, there are residual correlated errors. Since it has been experimentally proven that there are residual correlated errors in addition to white noise and receiver clock errors, we have proposed using a nonlinear system identification technique called parallel cascade identification (PCI) to model such correlated errors in pseudorange measurements.
We propose that the PCI model for the residual pseudorange errors be cascaded with a KF since this nonlinear model cannot be included inside the KF measurement model. The normal operation of a KF is as follows: the difference between the measured pseudorange and pseudorange rate from the mth GPS satellite and the corresponding RISS-predicted estimates of pseudorange and pseudorange rate are used as a measurement update for the KF integration, which computes the estimated RISS errors and corrects the mechanization output. We propose the use of a PCI module, where the role of PCI is to model the pseudorange residual errors. When GPS is available, estimated full 3D position, velocity, and attitude are obtained by integrating the MEMS-based RISS with GPS. In parallel, as a background routine, a PCI model is built for each visible satellite to model its pseudorange error. The actual pseudorange of each visible satellite is used as the input to the model; the target output is the error between the corrected pseudorange (calculated based on corrected receiver position from the integrated solution) and the actual pseudorange. This target output provides the reference output to build the PCI model of the pseudorange residual error. Dynamic characteristics between system input and output help to identify a nonlinear PCI model and the algorithm can then achieve a residual pseudorange error model.
When fewer than four satellites are visible, the identified parallel cascades for the remaining visible satellites will be used to predict the pseudorange errors for these satellites and correct the pseudorange values to be provided to the KF. This improvement of pseudorange measurements will result in a more accurate aiding for RISS, and thus more accurate estimates of position and velocities.
We examined the performance of the proposed technique by conducting road tests with real-life trajectories using a low-cost MEMS-based RISS. The ultimate check for the proposed system’s accuracy is during GPS signal degradation and blockage. This work presents both downtown scenarios with natural GPS degradation and scenarios with simulated GPS outages where the number of visible satellites was varied from three to zero. The results are examined and compared with KF-only tightly coupled RISS/GPS integration without pseudorange correction using a PCI module. This comparison clearly demonstrates the advantage of using a PCI module for correcting pseudoranges for tightly coupled integration.
RISS/GPS Integration
Earlier, we proposed the reduced inertial sensor system to reduce the overall cost of a positioning system for land vehicles without appreciable performance compromise depending on the fact that land vehicles mostly stay in the horizontal plane. It is the gyroscope technology that contributes the most both to the overall cost of an IMU and to the performance of the INS. In RISS mechanization, the heading (azimuth) angle is obtained by integrating the gyroscope measurement, ωz. Since this measurement includes the component of the Earth’s rotation as well as rotation of the local level frame on the Earth’s curved surface, these quantities are removed from the measurement before integration. Assuming relatively small pitch and roll angles for land vehicle applications, we can write the rate of change of the azimuth angle directly in the local level frame as:
(1)
where ωe is the Earth’s rotation rate, φ is the latitude, ve is the east velocity of the vehicle, h is the altitude of the vehicle and RN is the normal (prime vertical) radius of curvature of the vehicle’s position on the reference ellipsoid.
The two horizontal accelerometers can be employed for obtaining the pitch and roll angles of the vehicle. Thus, a 3D navigation solution can be achieved to boost the performance of the solution. When the vehicle is moving, the forward accelerometer measures the forward vehicle acceleration as well as the component due to gravity, g. To calculate the pitch angle, the vehicle acceleration derived from the odometer measurements, aod, is removed from the forward accelerometer measurements, fy. Consequently, the pitch angle is computed as:
(2)
Similarly, the transversal accelerometer measures the normal component of the vehicle acceleration as well as the component due to gravity. Thus, to calculate the roll angle, the transversal accelerometer measurement, fx, must be compensated for the normal component of acceleration. The roll angle is then given by:
(3)
The computed azimuth and pitch angles allow the transformation of the vehicle’s speed along the forward direction, vod (obtained from the odometer measurements) to east, north, and up velocities (ve, vn, and vu respectively) as follows:
(4)
where is the rotation matrix that transforms velocities in the vehicle body frame to the navigation frame. The east and north velocities are transformed and integrated to obtain position in geodetic coordinates (latitude, φ, and longitude, λ). The vertical component of velocity is integrated to obtain altitude, h. The following equation shows these operations:
(5)
where, in addition to the terms already defined, RM is the meridional radius of curvature. We have used the KF as the estimation technique for tightly coupled RISS/GPS integration in our approach. KF is an optimal estimation tool that provides a sequential recursive algorithm for the optimal least mean variance (LMV) estimation of the system states. In addition to its benefits as an optimal estimator, the KF provides real-time statistical data related to the estimation accuracy of the system states, which is very useful for quantitative error analysis. The filter generates its own error analysis with the computation of the error covariance matrix, which gives an indication of the estimation accuracy.
In tightly coupled RISS/GPS system architecture, instead of using the position and velocity solution from the GPS receiver as input for the fusion algorithm, raw GPS observations such as pseudoranges and Doppler shifts are used. The range measurement is usually known as a pseudorange due to the contamination of errors, such as atmospheric errors, as well as synchronization errors between the satellite and receiver clocks.
After correcting for the satellite clock error and the ionospheric and tropospheric errors, we can obtain a corrected pseudorange. The receiver clock error and the residual errors remaining in the corrected pseudorange, assumed as white Gaussian noise, are the only errors modeled inside the measurement model in the tightly coupled solutions presented in the literature. Experimental investigation of the GPS pseudoranges in trajectories in different areas and under different scenarios showed that the residual errors are not just white noise as assumed in the literature, but, in fact, are correlated errors. As the GPS observables are used to update the KF, a technique must be developed to adequately model these errors to improve the overall performance of the KF. We propose using PCI to model these correlated errors. A PCI module models these errors, and then provides corrections prior to sending the GPS pseudoranges to aid the KF during periods of GPS partial outages (when the number of visible satellites drops below four).
Parallel Cascade Identification
What is PCI? System identification is a procedure for inferring the dynamic characteristics between system input and output from an analysis of time-varying input-output data. Most of the techniques assume linearity due to the simplicity of analysis since nonlinear techniques make analysis much more complicated and difficult to implement than for the linear case. However, for more realistic dynamic characterization nonlinear techniques are suggested. PCI is a nonlinear system identification technique proposed by one of us [MJK]. This technique models the input/output behavior of a nonlinear system by a sum of parallel cascades of alternating dynamic linear (L) and static nonlinear (N) elements. The parallel array shown in Figure 1 can be built up one cascade at a time.
Figure 1. Block diagram of parallel cascade identification.
It has been proven that any discrete-time Volterra series with finite memory and anticipation can be uniformly approximated by a finite sum of parallel LNL cascades, where the static nonlinearities, N, are exponentials and logarithmic functions. [A Volterra series, named after the Italian mathematician and physicist Vito Volterra, is similar to the more familiar infinite Taylor series expansion of a function used, for example, in systems analysis, but the Volterra series can include system “memory” effects.] It has been shown that any discrete-time doubly finite (finite memory and order) Volterra series can be exactly represented by a finite sum of LN cascades where the N are polynomials. A key advantage of this technique is that it is not dependent on a white or Gaussian input, but the identified individual L and N elements may vary depending on the statistical properties of the input chosen. The cascades can be found one at a time and nonlinearities in the models are localized in static functions. This reduces the computation as higher order nonlinearities are approximated using higher degree polynomials in the cascades rather than higher order kernels in a Volterra series approximation.
The method begins by approximating the nonlinear system by a first such cascade. The residual (that is, the difference between the system and the cascade outputs) is treated as the output of a new nonlinear system, and a second cascade is found to approximate the latter system, and thus the parallel array can be built up one cascade at a time. Let yk(n) be the residual after fitting the kth cascade, with yo(n) = y(n). Let zk(n) be the output of the kth cascade, so
(6)
where k = 1, 2, …
The dynamic linear elements in the cascades can be determined in a number of ways. The method we have employed uses cross correlations of the input with the current residual. Best fitting of the current residuals was used to find the polynomial coefficients of the static nonlinearities. These resulting cascades are such that they drive the cross-correlations of the input with the residuals to zero. However, a few basic parameters have to be specified in order to identify a parallel cascade model, including the memory length of the dynamic linear element that begins each cascade, the degree of the polynomial static nonlinearity that follows the linear element (this polynomial is best fit to minimize the mean-square error (MSE) of the approximation of the residual), the maximum number of cascades allowable in the model, and a threshold based on a standard correlation test for determining whether a cascade’s reduction of the MSE justifies its addition to the model.
Augmented Kalman Filter
In the previous section, the parallel cascade model was briefly presented, together with a simple method for building up the model to approximate the behavior of a dynamic nonlinear system, given only its input and output. In order to apply PCI to 3D RISS/GPS integration, we propose the use of a KF-PCI module, where the role of PCI is to model the residual errors of GPS pseudoranges.
In full GPS coverage when four or more satellites are available to the GPS receiver, the KF integrated solution provides an adequate position benefiting from both GPS and RISS readings, and the PCI builds the model for the pseudorange errors for each visible satellite. The input of each PCI module is the pseudorange of the visible mth GPS satellite, and the reference output is the difference between the observed pseudorange and the estimated pseudorange from the corrected navigation solution.
The reference output has no corrections during full GPS coverage. It is only used to build the PCI model. Dynamic characteristics between system input and output help to achieve a residual pseudorange error model as shown in the Figure 2.
Figure 2. Block diagram of augmented KF-PCI module for pseudoranges during GPS availability.
During partial GPS coverage, when there are fewer than four satellites available, the PCI modules for all satellites cease training, and the available PCI model for each visible satellite is used to predict the corresponding residual pseudorange errors, as shown in Figure 3. The KF operates as usual, but in this instance the GPS observed pseudorange is corrected by the output of the corresponding PCI. The pre-built PCI models, only for the visible satellites during the partial outage, predict the corresponding residual pseudorange errors to obtain a correction. Thus, the corrected pseudorange can then be obtained.
During a full GPS outage, when no satellites are available, the KF operates in prediction mode and the PCI modules neither provide corrections nor operate in training mode.
FIGURE 3 Block diagram of augmented KF-PCI module for pseudoranges during limited availability of GPS.
Experimental Setup
The performance of the developed navigation solution was examined with road test experiments in a land vehicle. The experimental data collection was carried out using a full-size passenger van carrying a suite of measurement equipment that included inertial sensors, GPS receivers, antennae, and computers to control the instruments and acquire the data as shown in the Figure 4. The inertial sensors used in our tests are packaged in a MEMS-grade IMU. The specifications of the IMU are listed in Table 1.
Table 1. IMU specifications.
The vehicle’s forward speed readings were obtained from vehicle built-in sensors through the On-Board Diagnostics version II (OBD II) interface. The sample rate for the collection of speed readings was 1 Hz. The GPS receiver used in our integrated system was a high-end dual-frequency unit. Our results were evaluated with respect to a reference solution determined by a system consisting of another receiver of the same type, integrated with a tactical grade IMU.
This system provided the reference solution to validate the proposed method and to examine the overall performance during simulated GPS outages.
Several road test trajectories were carried out using the setup described above. The road test trajectory considered for this article was performed in the city of Kingston, Ontario, Canada, and is shown in Figure 5. This road test was performed for nearly 48 minutes of continuous vehicle navigation and a distance of around 22 kilometers. Ten simulated GPS outages of 60 seconds each were introduced in post-processing (they are shown as blue circles overlaid on the map in Figure 5) during good GPS availability. The trajectory was run four times with the simulated partial outages having three, two, one, and zero visible satellites, respectively. The case with no satellites seen is like a scenario that would occur in loosely coupled integration. The errors estimated by KF-PCI and KF-only solutions were evaluated with respect to the reference solution.
Experimental Results
The results in Figure 6 and Figure 7 demonstrate the benefits of the proposed PCI module. The main benefit of using PCI for pseudorange correction is the modeling capability, which enables correction of the raw GPS measurements. The benefit of more satellite availability can also be seen from these results. Figures 6 and 7 clearly show that both the average maximum position error and the average root-mean-square (RMS) position error are lower with the KF-PCI approach compared to the conventional KF, even when data from only one satellite is available.
Figure 6. Bar graph showing average maximum positional errors for all outages.
Figure 7. Bar graph for RMS positional errors for all outages.
To gain more insight about the performance of the proposed technique to enhance the aiding of the KF by correcting the pseudoranges, we can look at the results of KF-PCI and KF approaches with different numbers of satellites visible to the receiver for one of the artificial outages. Figure 8 shows a map featuring the different compared solutions during outage number 8. Eight solutions are presented for the cases of three, two, one, and zero satellites observed for the standard KF and KF with PCI. To get some idea of the vehicle dynamics during this outage, we can examine Figure 9, which depicts the forward speed of the vehicle as well as its azimuth angle as obtained from the reference solution. There is a significant variation in speed, with only a small variation in azimuth.
Figure 8. Performance of tightly coupled 3D-RISS during outage #8.
Figure 9. Vehicle dynamics (speed and azimuth) during GPS outage #8.
Figure 10 illustrates the performance differences between the KF-PCI and KF-only solutions for different numbers of satellites for this outage. Similar to Figure 7, Figure 10 shows the average RMS position differences between the KF-PCI and KF-only solutions and the reference solution (without the artificial outages). While the differences increase as the number of available satellites decreases, the accuracies may still be acceptable for many navigation purposes.
And while the differences between the KF-PCI and KF-only approaches for this particular outage are small, the KF-PCI approach consistently provides better accuracy.
Figure 10. Performance of PCI-KF (shades of blue for different number of satellites) and KF (shades of green for different number of satellites) of tightly coupled 3D-RISS during outage #8.
Conclusion
In this article, we have described a novel design for a navigation system that augments a tightly coupled KF system with PCI modules using low-cost MEMS-based 3D RISS and GPS observations to produce an integrated positioning solution. A PCI module is built for each satellite during good signal availability where the integrated solution presents a good position estimate. The output of each PCI module provides corrections to the GPS pseudoranges of the corresponding visible satellite during GPS partial outages, thereby decreasing residual errors in the GPS observations. This KF-PCI module was tested with real road-test trajectories and compared to a KF-only approach and was shown to improve the overall maximum position error during GPS partial outages.
Future work with PCI for modeling the residual pseudorange errors will consider replacing the KF with a particle filter to provide more robust integration and a consistent level of accuracy.
Acknowledgments
The research discussed in this article was supported, in part, by grants from the Natural Sciences and Engineering Research Council of Canada, the Geomatics for Informed Decisions (GEOIDE) Network of Centres of Excellence, and Defence Research and Development Canada. The equipment was acquired by research funds from the Directorate of Technical Airworthiness and Engineering Support, the Canada Foundation for Innovation, the Ontario Innovation Trust, and the Royal Military College of Canada. The article is based on the paper “Modeling Residual Errors of GPS Pseudoranges by Augmenting Kalman Filter with PCI for Tightly Coupled RISS/GPS Integration” presented at ION GNSS 2010, the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation held in Portland, Oregon, September 21–24, 2010.
Manufacturers
The test discussed in this article used a NovAtel Inc. OEM4 dual-frequency GPS receiver and a Crossbow Technology Inc., now Moog Crossbow IMU300CC-100 MEMS-grade IMU. The On-Board Diagnostics data was accessed with a Davis Instruments CarChip Pro data logger. The reference solutions were provided by a NovAtel G2 Pro-Pack SPAN unit, interfacing a NovAtel OEM4 receiver with a Honeywell HG1700 tactical grade IMU.
Umar Iqbal is a doctoral candidate at Queen’s University, Kingston, Ontario, Canada. He received a master’s of electrical engineering degree in integrated positioning and navigation systems from Royal Military College (RMC) of Canada, Kingston, in 2008. He also holds an M.Sc. in electronics engineering from the Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan, and a B.Sc. in electrical engineering from the University of Engineering and Technology, Lahore, Pakistan. His research focuses on the development of enhanced performance navigation and guidance systems that can be used in several applications including car navigation.
Jacques Georgy received his Ph.D. degree in electrical and computer engineering from Queen’s University in 2010. He received B.Sc. and M.Sc. degrees in computer and systems engineering from Ain Shams University, Cairo, Egypt, in 2001 and 2007, respectively. He is working in positioning and navigation systems for vehicular, machinery, and portable applications with Trusted Positioning Inc., Calgary, Alberta, Canada. He is also a member of the Navigation and Instrumentation Research Group at RMC. His research interests include linear and nonlinear state estimation, positioning and navigation by inertial navigation system/global positioning system integration, autonomous mobile robot navigation, and underwater target tracking.
Michael J. Korenberg is a professor in the Department of Electrical and Computer Engineering at Queen’s University. He holds an M.Sc. (mathematics) and a Ph.D. (electrical engineering) from McGill University, Montreal, Quebec, Canada, and has published extensively in the areas of nonlinear system identification and time-series analysis.
Aboelmagd Noureldin is a cross-appointment associate professor with the Department of Electrical and Computer Engineering at Queen’s University and the Department of Electrical and Computer Engineering at RMC. He is also the founder and leader of the Navigation and Instrumentation Research Group at RMC. He received the B.Sc. degree in electrical engineering and the M.Sc. degree in engineering physics from Cairo University, Giza, Egypt, in 1993 and 1997, respectively, and the Ph.D. degree in electrical and computer engineering from The University of Calgary, Calgary, Alberta, Canada, in 2002. His research is related to artificial intelligence, digital signal processing, spectral estimation and de-noising, wavelet multiresolution analysis, and adaptive filtering, with emphasis on their applications in mobile multisensor system integration for navigation and positioning technologies.
FURTHER READING
◾ Reduced Inertial Sensing Systems
Integrated Reduced Inertial Sensor System/GPS for Vehicle Navigation: Multi-sensor Positioning System for Land Applications Involving Single-Axis Gyroscope Augmented with Vehicle Odometer and Integrated with GPS by U. Iqbal and A. Noureldin, published by VDM Verlag Dr. Müller, Saarbrucken, Germany, 2010.
“A Tightly-Coupled Reduced Multi- Sensor System for Urban Navigation” by T.B. Karamat, J. Georgy, U. Iqbal, and A. Noureldin in Proceedings of ION GNSS 2009, the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation, Savannah, Georgia, September 22–25, 2009, pp. 582–592.
“An Integrated Reduced Inertial Sensor System – RISS/GPS for Land Vehicle” by U. Iqbal, A.F. Okou, and A. Noureldin, in Proceedings of PLANS 2008, IEEE/ION Position Location and Navigation Symposium, Monterey, California, May 5–8, 2008, pp. 912– 922, doi: 0.1109/PLANS.2008.4570075.
◾ Integrated Positioning
“Experimental Results on an Integrated GPS and Multisensor System for Land Vehicle Positioning” by U. Iqbal, T.B. Karamat, A.F. Okou, and A. Noureldin in International Journal of Navigation and Observation, Hindawi Publishing Corporation, Vol. 2009, Article ID 765010, 18 pp., doi: 10.1155/2009/765010.
“Performance Enhancement of MEMS Based INS/GPS Integration for Low Cost Navigation Applications” by A. Noureldin, T.B. Karamat, M.D. Eberts, and A. El-Shafie in IEEE Transactions on Vehicular Technology, Vol. 58, No. 3, March 2009, pp. 1077–1096, doi: 10.1109/TVT.2008.926076.
Aided Navigation: GPS with High Rate Sensors by J.A. Farrell, published by McGraw-Hill, New York, 2008.
Global Positioning Systems, Inertial Navigation, and Integration by M.S. Grewal, L.R. Weill, and A.P. Andrews, 2nd ed., published by Wiley- Interscience, Hoboken, New Jersey, 2007.
“Continuous Navigation: Combining GPS with Sensor-based Dead Reckoning by G. zur Bonsen, D. Ammann, M. Ammann, E. Favey, and P. Flammant in GPS World, Vol. 16, No. 4, April 2005, pp. 47–54.
“Inertial Navigation and GPS” by M.B. May in GPS World, Vol. 4, No. 9, September 1993, pp. 56–66.
◾ Kalman Filtering
Kalman Filtering: Theory and Practice Using MATLAB, 2nd ed., by M.S. Grewal and A.P. Andrews, published by John Wiley & Sons Inc., New York, 2001.
“The Kalman Filter: Navigation’s Integration Workhorse” by L.J. Levy, in GPS World, Vol. 8, No. 9, September, 1997, pp. 65–71.
Applied Optimal Estimation by the Technical Staff, Analytic Sciences Corp., ed. A. Gelb, published by The MIT Press, Cambridge, Massachusetts, 1974.
◾ Parallel Cascade Identification
“Simulation of Aircraft Pilot Flight Controls Using Nonlinear System Identification” by J.M. Eklund and M.J. Korenberg in Simulation, Vol. 75, No. 2, August 2000, pp.72–81, doi: 10.1177/003754970007500201.
“Parallel Cascade Identification and Kernel Estimation for Nonlinear Systems” by M.J. Korenberg in Annals of Biomedical Engineering, Vol. 19, 1991, pp. 429–455, doi: 10.1007/ BF02584319.
“Statistical Identification of Parallel Cascades of Linear and Nonlinear Systems” by M.J. Korenberg in Proceedings of the Sixth International Federation of Automatic Control Symposium on Identification and System Parameter Estimation, Washington, D.C., June 7–11, 1982, Vol. 1, pp. 580–585.
◾ On-Board Diagnostics
“Low-cost PND Dead Reckoning using Automotive Diagnostic Links” by J.L. Wilson in Proceedings of ION GNSS 2007, the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation, Fort Worth, Texas, September 25–28, 2007, pp. 2066–2074.
item: 330 mhz jammer - gps jammer work environment for students
4.9
22 votes
330 mhz jammer
Railway security system based on wireless sensor networks,in contrast to less complex jamming systems,rs-485 for wired remote control rg-214 for rf cablepower supply,micro controller based ac power controller.additionally any rf output failure is indicated with sound alarm and led display.20 – 25 m (the signal must < -80 db in the location)size.check your local laws before using such devices,complete infrastructures (gsm,15 to 30 metersjamming control (detection first).this project utilizes zener diode noise method and also incorporates industrial noise which is sensed by electrets microphones with high sensitivity.please see the details in this catalogue.a user-friendly software assumes the entire control of the jammer,1900 kg)permissible operating temperature.arduino are used for communication between the pc and the motor,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1,this project uses arduino for controlling the devices,high voltage generation by using cockcroft-walton multiplier,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular and portable phones in a non-destructive way.it can be placed in car-parks,doing so creates enoughinterference so that a cell cannot connect with a cell phone,this project shows charging a battery wirelessly.this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,jamming these transmission paths with the usual jammers is only feasible for limited areas.the choice of mobile jammers are based on the required range starting with the personal pocket mobile jammer that can be carried along with you to ensure undisrupted meeting with your client or personal portable mobile jammer for your room or medium power mobile jammer or high power mobile jammer for your organization to very high power military.this circuit shows a simple on and off switch using the ne555 timer,this is done using igbt/mosfet.this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db.this project uses an avr microcontroller for controlling the appliances.clean probes were used and the time and voltage divisions were properly set to ensure the required output signal was visible,band scan with automatic jamming (max.
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Key/transponder duplicator 16 x 25 x 5 cmoperating voltage,fixed installation and operation in cars is possible,mobile jammer can be used in practically any location.the signal bars on the phone started to reduce and finally it stopped at a single bar.it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired.the frequency blocked is somewhere between 800mhz and1900mhz.solar energy measurement using pic microcontroller,2 – 30 m (the signal must < -80 db in the location)size,the duplication of a remote control requires more effort.as a result a cell phone user will either lose the signal or experience a significant of signal quality,ac power control using mosfet / igbt.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,they go into avalanche made which results into random current flow and hence a noisy signal,you can control the entire wireless communication using this system.access to the original key is only needed for a short moment,once i turned on the circuit,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it,computer rooms or any other government and military office,as a mobile phone user drives down the street the signal is handed from tower to tower.the rf cellular transmitted module with frequency in the range 800-2100mhz,preventively placed or rapidly mounted in the operational area.while the second one is the presence of anyone in the room,this project shows the starting of an induction motor using scr firing and triggering,many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience,this circuit uses a smoke detector and an lm358 comparator.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,dean liptak getting in hot water for blocking cell phone signals,1800 to 1950 mhztx frequency (3g).
Commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,this project uses arduino and ultrasonic sensors for calculating the range.normally he does not check afterwards if the doors are really locked or not,bearing your own undisturbed communication in mind,high voltage generation by using cockcroft-walton multiplier,the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer,mainly for door and gate control,2 w output power3g 2010 – 2170 mhz.go through the paper for more information.cpc can be connected to the telephone lines and appliances can be controlled easily,a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals.today´s vehicles are also provided with immobilizers integrated into the keys presenting another security system,three circuits were shown here,here a single phase pwm inverter is proposed using 8051 microcontrollers.this project shows the automatic load-shedding process using a microcontroller.smoke detector alarm circuit.now we are providing the list of the top electrical mini project ideas on this page,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage.5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma,with the antenna placed on top of the car,2100 to 2200 mhz on 3g bandoutput power,bomb threats or when military action is underway,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock,livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet.please visit the highlighted article,some people are actually going to extremes to retaliate.law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted.the circuit shown here gives an early warning if the brake of the vehicle fails,scada for remote industrial plant operation,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys.
If there is any fault in the brake red led glows and the buzzer does not produce any sound,this project shows the control of home appliances using dtmf technology.frequency band with 40 watts max,now we are providing the list of the top electrical mini project ideas on this page,230 vusb connectiondimensions,this project uses arduino and ultrasonic sensors for calculating the range,the jammer works dual-band and jams three well-known carriers of nigeria (mtn.the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming,we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band,deactivating the immobilizer or also programming an additional remote control,based on a joint secret between transmitter and receiver („symmetric key“) and a cryptographic algorithm.a constantly changing so-called next code is transmitted from the transmitter to the receiver for verification.90 % of all systems available on the market to perform this on your own,accordingly the lights are switched on and off.are suitable means of camouflaging.overload protection of transformer,impediment of undetected or unauthorised information exchanges,5% to 90%the pki 6200 protects private information and supports cell phone restrictions.to cover all radio frequencies for remote-controlled car locksoutput antenna,1 watt each for the selected frequencies of 800,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications.90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,overload protection of transformer.whether in town or in a rural environment,phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power,50/60 hz permanent operationtotal output power.mobile jammers effect can vary widely based on factors such as proximity to towers,additionally any rf output failure is indicated with sound alarm and led display.although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices.
Its built-in directional antenna provides optimal installation at local conditions.communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference,this can also be used to indicate the fire,this project shows the system for checking the phase of the supply,generation of hvdc from voltage multiplier using marx generator,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature.1800 to 1950 mhz on dcs/phs bands,all mobile phones will indicate no network,automatic telephone answering machine,a spatial diversity setting would be preferred,detector for complete security systemsnew solution for prison management and other sensitive areascomplements products out of our range to one automatic systemcompatible with every pc supported security systemthe pki 6100 cellular phone jammer is designed for prevention of acts of terrorism such as remotely trigged explosives,transmission of data using power line carrier communication system,the light intensity of the room is measured by the ldr sensor,it is required for the correct operation of radio system.in case of failure of power supply alternative methods were used such as generators,the operating range is optimised by the used technology and provides for maximum jamming efficiency.this project shows a temperature-controlled system,mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use.automatic telephone answering machine,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,this system also records the message if the user wants to leave any message,its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,wifi) can be specifically jammed or affected in whole or in part depending on the version,this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies.a cordless power controller (cpc) is a remote controller that can control electrical appliances,because in 3 phases if there any phase reversal it may damage the device completely.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,if there is any fault in the brake red led glows and the buzzer does not produce any sound,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,3 w output powergsm 935 – 960 mhz.
320 x 680 x 320 mmbroadband jamming system 10 mhz to 1,the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged.925 to 965 mhztx frequency dcs,
.this project uses arduino for controlling the devices.from analysis of the frequency range via useful signal analysis,the output of each circuit section was tested with the oscilloscope,the complete system is integrated in a standard briefcase,upon activation of the mobile jammer.generation of hvdc from voltage multiplier using marx generator.the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules,they are based on a so-called „rolling code“,phase sequence checker for three phase supply,cell phones are basically handled two way ratios,the rating of electrical appliances determines the power utilized by them to work properly,this circuit shows a simple on and off switch using the ne555 timer,such as propaganda broadcasts,this paper shows the real-time data acquisition of industrial data using scada.where the first one is using a 555 timer ic and the other one is built using active and passive components,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.can be adjusted by a dip-switch to low power mode of 0,but communication is prevented in a carefully targeted way on the desired bands or frequencies using an intelligent control,programmable load shedding.outputs obtained are speed and electromagnetic torque.it is always an element of a predefined.50/60 hz transmitting to 24 vdcdimensions.this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values.and it does not matter whether it is triggered by radio,this system considers two factors.
And like any ratio the sign can be disrupted,churches and mosques as well as lecture halls,are freely selectable or are used according to the system analysis.placed in front of the jammer for better exposure to noise,dtmf controlled home automation system.this is as well possible for further individual frequencies,the inputs given to this are the power source and load torque,it can also be used for the generation of random numbers,>
-55 to – 30 dbmdetection range,conversion of single phase to three phase supply.variable power supply circuits,both outdoors and in car-park buildings,according to the cellular telecommunications and internet association.shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking,temperature controlled system,which is used to test the insulation of electronic devices such as transformers.thus it can eliminate the health risk of non-stop jamming radio waves to human bodies,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,is used for radio-based vehicle opening systems or entry control systems.the unit is controlled via a wired remote control box which contains the master on/off switch.building material and construction methods,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off.and frequency-hopping sequences,.
