2021/04/14
Precise, Accurate and Multipath-Resistant Distance and Speed Measurements
In this month’s column, we take a look at a short-distance two-way ranging system using a 5.8-GHz carrier to supply not only precise and accurate distance measurements but also complementary measurements of speed.
By Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor
INNOVATION INSIGHTS by Richard Langley
THERE IS A LONG HISTORY of determining distances using radio waves with a large number of techniques being developed over the years for positioning, navigation, situational awareness and other purposes.
Of course, we are all familiar with the latest and greatest distance-measuring technology: GPS and its GNSS brethren. The distance to each observable satellite is determined by measuring the time it takes for the radio signal to travel from the transmitting antenna of the satellite to the receiver’s antenna and then, using the speed of light in a vacuum (which is also the speed of radio waves), converting the signal travel time into a distance. Distances can be determined from either the signal’s modulation (the pseudorandom noise codes) or the carrier phase. Both approaches require modeling and estimation to account for various errors or biases.
GPS is an example of one-way ranging. Other systems, notably radar, are two-way systems relying on reflections (passive ranging) or transponders (active ranging) to return a signal to the point of transmission.
Radar was developed during Word War II although radio-ranging technologies and techniques existed before the war started (to measure the height of the ionosphere, for example) and allowed radar’s rapid development and use during the war.
Besides ranging to terrestrial objects, radar has been used extraterrestrially. Independent experiments in the United States and Hungary in 1946 resulted in the first detections of radar reflections from the moon. Radar has been used subsequently to range to other solar system bodies as well.
Also developed during World War II were several radio-based systems for aircraft navigation. An outgrowth of these were the Loran-C and Omega hyperbolic positioning systems. They operated with networks of coordinated transmitters using frequencies at the low end of the radio spectrum. With widespread GPS availability, Omega was shut down in September 1997 followed by the North American Loran-C chains in 2010. Other chains are threatened with closure. However, there is an ongoing debate about bringing Loran-C back to North America in the form of Enhanced Loran (eLoran) as an autonomous backup for GPS. The United Kingdom has already implemented an eLoran network. Among other improvements, eLoran uses range measurements from multiple transmitters to determine position fixes.
The first terrestrial electromagnetic-distance-measurement or EDM device using microwave signals was the Tellurometer. Developed for surveying in 1954, it initially used a 3-GHz carrier modulated by frequencies near 10 MHz and was capable of accurately measuring distances up to at least 50 kilometers (line of sight).
Ranging can be performed with virtually any radio signal, and viable positioning techniques have been developed to use so-called signals of opportunity such as AM, FM and TV signals. And purpose-designed systems have been developed using ultra-wideband and other short-distance radio technologies.
An issue with any radio-based ranging system is multipath where, in addition to a direct line-of-sight signal, interfering signals are received after being reflected off nearby structures. Multipath degrades the system’s achievable precision and accuracy. Better performance can be obtained by using measurements on the signal’s carrier rather than on its modulation, and the higher the carrier frequency, generally the smaller will be the multipath error in the distance measurement. In this month’s column, we take a look at a short-distance two-way ranging system using a 5.8-GHz carrier to supply not only precise and accurate distance measurements but also complementary measurements of speed.
“Innovation” is a regular feature that discusses advances in GPS technology and its applications as well as the fundamentals of GPS positioning. The column is coordinated by Richard Langley of the Department of Geodesy and Geomatics Engineering, University of New Brunswick. He welcomes comments and topic ideas. Email him at lang @ unb.ca.
Reliable measurements of distance and speed are a critical aid to integrated positioning and navigation systems. Several different sensor technologies can provide such measurements including a variety of radio frequency (RF) ranging techniques. Previous work by the authors based on round-trip time-of-flight RF ranging using the baseband code phase of direct sequence spread spectrum (DSSS)-modulated signals achieves centimeter-level distance estimation performance. This DSSS ranging implementation approaches the Cramér-Rao lower bound in a benign RF channel (the theoretical lower bound on the variance or corresponding standard deviation of any unbiased estimator of a deterministic parameter — the best we can ever expect to achieve). A distance measuring radio (DMR) produced by our company is shown in FIGURE 1.
FIGURE 1. Distance measuring radio. The dimensions of the radio are 160 × 69 × 13.3 millimeters with a mass of 180 grams. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
Our baseband ranging capability has been demonstrated on a direct conversion radio operating in the unlicensed 5.8-GHz industrial, scientific and medical (ISM) band with approximately 20 MHz RF signal bandwidth, and has been previously implemented in the 2.4 GHz and 915 MHz ISM bands. The system uses an 11-megachip-per-second chipping rate and a symbol rate of about 687 kHz per channel (16 chips per symbol). This method has been implemented with both binary phase-shift keying (BPSK) and quadrature phase-shift keying (QPSK) modulation. The same signal that is used for ranging is also used for data communications. A decentralized asynchronous carrier-sense multiple access with collision avoidance (CSMA/CA) networking layer supports networked operation.
The DMR performs real-time digital signal processing on a Kintex-7 field-programmable gate array (FPGA) baseband processor to compute ranging observables on the received baseband packet structure. A round-trip measurement duration under three milliseconds allows for approximately 350 measurements per second for a single pair of DMRs. Measurements do not require a priori synchronization of the remote radios nor high-performance reference oscillators, as remote oscillator behavior is observed in the ranging operation. The measurement is highly compatible with frequency agility techniques. A system of ranging radios provides networked operation for measurements between multiple platforms.
The primary limitation of DSSS code-phase ranging is degraded accuracy and reliability in challenging multipath environments. This is somewhat mitigated by a “quality factor” observation on the characteristics of the received DSSS baseband signal, which can be used to de-weight or exclude corrupted baseband ranging measurements from an integrated navigation or positioning filter. However, it is desirable to provide a ranging measurement that has improved robustness against multipath corruption in all environments.
Multipath Effects on Carrier Phase
The carrier phase of the DSSS ranging signal in space can be used as an additional ranging measurement. Each 5.8-GHz RF carrier-wave cycle has a length of about 52 millimeters. Phase measurements on the received carrier phase in a round-trip ranging exchange are proportional to the propagation distance of the RF signal over the air. These measurements of the carrier phase can be made precisely, and they are inherently more tolerant to multipath than baseband phase measurements.
Consider a simplified two-ray RF channel model, where there is a direct RF line-of-sight (LOS) path and a multipath (MP) reflection. The two signals will have a phase difference between MP and LOS of θm and an amplitude ratio of MP to LOS of α, which lumps together the attenuation due to the additional path length of the MP signal, the reflection coefficient of the reflecting surface, the difference in antenna gain at the incidence angles and other factors. The received signal will be a superposition of the two signals with a phase difference between this composite and the original LOS of θc. This phase difference is the multipath-induced error on the received carrier phase. The worst-case error will occur when there is a small difference in total path length. In this case, the LOS and MP are inseparable by the DSSS receiver, and the error is bounded by Equation 1. The error is reduced for MP with much longer path length due to both a reduced amplitude coefficient α of the MP signal, as well as separation by the DSSS receiver due to the baseband spreading codes.
(1)
The multipath carrier-phase error bounds are ±90 degrees for α ≤ 1, which is satisfied when there is an RF LOS signal present. In practice, α is typically much less than 1. For a more practical case of α = 0.1, the maximum carrier-phase error is less than ±6 degrees. At 5.8 GHz RF, ±6 degrees corresponds to about 0.1 millimeters. A plot of this response for various values of α is shown in FIGURE 2.
FIGURE 2. Carrier-phase error due to multipath interference for various values of relative multipath amplitude. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
As a physical interpretation, the carrier-phase error goes to zero when there is zero phase difference between LOS and MP signals as the signals happen to be in phase already, and at ±180 degrees where the MP signal is in phase with the LOS signal but with inverted polarity, and serves to reduce the magnitude of the received signal, which is the case in a deep multipath fade. MP signals arrive at a dynamic receiver with an unpredictable distribution of relative phase to the LOS signal due to platform motion. This resistance to multipath is highly desirable for use in an RF ranging system. The following sections will present a ranging method that leverages this useful behavior.
Carrier-Phase Ranging Measurement
Each DMR round-trip ranging exchange consists of transmission and reception of a packet between two cooperating DMR devices, typically termed “originator” and “transponder” with roles determined by software configuration. For baseband ranging, the code phase is computed on the oversampled shape of the DSSS correlator output and exchanged in the round-trip measurement. The number of elapsed baseband clock periods between receive and transmit on the transponder and between transmit and receive on the originator are also observed to compute a round-trip coarse time. These measurements, plus a calibration offset due to cabling and other systematic delays, are used to perform baseband ranging.
Two additional observations are required for carrier-phase ranging: the carrier phase of the received DSSS signal in space and the carrier-frequency offset of the received carrier with respect to the local oscillator on the receiving radio. These observables are exchanged in a round-trip transaction, generating carrier-phase range (CPR), the magnitude of carrier-phase velocity (CPV) and clock-offset measurements. This section will describe the background of the CPR and CPV measurements.
Assuming the communicating DMRs operate with identical carrier frequencies, the round-trip carrier-phase ranging measurement is a function of the RF carrier wavelength λC = c/fC and the received phase on each DMR (φO and φT) in units of radians. The measurement is ambiguous by Namb half-wavelengths, as shown in Equation 2.
(2)
The frequency offsets measured at each receiver (SO and ST) in units of hertz will reflect the Doppler-based velocity offset between the two receivers, as shown in Equation 3.
(3)
While the velocity measurement is absolute, the carrier-phase ranging measurement is ambiguous within a half-wavelength in a round-trip measurement. There are several ways to overcome this limitation including using the velocity measurement to “unwrap” sequential carrier-phase observations, using baseband phase measurements to establish absolute offsets, by aiding the measurement with a strapdown inertial measurement unit (IMU) and by other means. The primary error source for carrier-phase ranging in practice is the solution of integer ambiguity, not the actual phase measurements. The quality of the phase measurements becomes the limiting factor when the integer ambiguity is resolved perfectly. An analysis of the Cramér-Rao lower bound (CRLB) for carrier-phase ranging and carrier-frequency velocity measurements along with measured performance is presented in the following section.
Measurement Performance Bounds
The CRLB for estimation of phase and frequency of a sinusoid based on a number of data samples in additive white Gaussian noise has been previously treated in the literature and can be interpreted to provide a best case, lower bound on how well the measurements could perform. The CRLBs for carrier-frequency and phase estimation are computed in terms of the sinusoid’s signal-to-noise ratio, SNR, the number of observed samples of the phase of the signal NS and the sample rate of the measurement system fS.
The CRLB for the standard deviation of carrier-phase ranging measurements is presented in Equation 4 in units of radians. In general, the standard deviation of carrier-phase measurements improves with the square root of NS and the square root of SNR.
(4)
The CRLB for carrier-phase estimation can be used to compute the CRLB for carrier-phase ranging by scaling each measurement by λC
(5)
This CRLB can be interpreted for the carrier-phase ranging observable generation process used in this DMR system. NS can be expanded to Equation 6, with NC = 12 chips out of a 16-chip pseudorandom noise code, α = 400 symbols typically tracked (assuming 100 symbrols are consumed in automatic gain control out of a 512-symbol preamble), and fSample/fChip = 44 MHz/11 MHz = 4. [Note different use of the character α here than in the section on multipath.] This gives NS = 400 · 12 · 4 = 19,200 in a typical usable DMR preamble as currently implemented.
(6)
FIGURE 3 shows the CRLB for carrier-phase ranging measurement evaluated over a range of SNR and with a varying number of symbols used in the ranging preamble, with typical α = 400 in the current implementation. Evaluating the phase CRLB at a conservatively low SNR = 10 dB and typical NS = 19,200 on a 5.8-GHz RF carrier yields a lower bound of about 27 micrometers standard deviation for a round-trip carrier-phase ranging measurement.
FIGURE 3. Cramér-Rao lower bound for carrier-phase ranging with different numbers of symbols used in the ranging preamble. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
The CRLB for the standard deviation of carrier-frequency-offset measurements is presented in Equation 7 in units of hertz. In general, the standard deviation of carrier-frequency observation improves with NS3/2 and the square root of SNR.
(7)
The CRLB for carrier-frequency estimation can be used to compute the CRLB for carrier-phase velocity by scaling each measurement by λC to convert to meters per second, and reducing the standard deviation by the square root of 2 due to the two independent phase measurements being conducted in the round-trip experiment as shown in Equation 8.
(8)
Evaluating the round-trip carrier-phase velocity CRLB at a conservatively low SNR = 10 dB and typical NS = 19,200 on a 5.8-GHz RF carrier yields a lower bound of about 10 centimeters per second velocity standard deviation. FIGURE 4 shows the CRLB for velocity measurement evaluated over a range of SNR and with varying number of symbols used in the ranging preamble.
FIGURE 4. Cramér-Rao lower bound for carrier-phase velocity with different numbers of symbols used in the ranging preamble. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
These CRLB levels predict that excellent CPR with precision much better than millimeter level and CPV precision much better than a meter per second should be achievable with the designed system assuming a perfect carrier-frequency generation circuit operating in additive white Gaussian noise. The practical limiting factor for these measurements at high SNR is typically the phase-noise performance of the reference oscillators themselves.
Measurement Results
CPR measurements have been implemented in our DMRs and tested in a variety of environments. In a static data collection, CPR demonstrates a stationary precision of approximately 0.1 millimeters at one sigma as shown in the histogram in FIGURE 5. The red line indicates the best-fit to a Gaussian curve of the measurement data, showing very well behaved data.
FIGURE 5. Histogram showing carrier-phase range precision. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
A static collection of CPV measurements demonstrates a precision of approximately 15 centimeters per second at one sigma as shown in the histogram of CPV data in FIGURE 6, which also has the best fit Gaussian distribution overlaid. The performance of these measurements approaches the CRLB.
FIGURE 6. Histogram showing carrier-phase velocity precision. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
To further quantify the accuracy of CPR, a test was conducted comparing CPR to the distance measured by a survey-grade total station laser rangefinder. The transponding radio was mounted on a tripod and moved to varying distances away from the originating radio, which was located near the total station. FIGURE 7 shows the distance-measurement results. The blue dots are the baseband distance measurements and the red dots are the unwrapped carrier-phase range distance measurements. The mean distance and scatter within each stationary period were used to evaluate the precision and accuracy of CPR versus the total station rangefinder values.
FIGURE 7. Distance determined from baseband ranging (blue) and carrier-phase ranging (red) data collected during a test with varying distances between originating and transponding radios and using a total station to provide ground-truth. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
FIGURE 8 shows the outcome of the laser-based total station ground-truth validation of the carrier-phase distance measuring performance in an outdoor LOS environment. The red lines indicate the ±8 millimeter experimental accuracy of the laser ground-truth test setup. The error from each surveyed point is within the uncertainty of the test, with an experimental precision of 0.6 millimeters at one sigma indicated by the vertical error bars on each data point.
FIGURE 8. Range comparison between CPR and a total station. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
System Integration
CPR and CPV measurements have been successfully integrated into a pedestrian tracking dual boot-mounted inertial system. In this configuration, one industrial-grade microelectromechanical systems IMU operating at 400 Hz (three-axis accelerometer, three-axis gyro and three-axis magnetic compass) is mounted on the heel of each boot, and a DMR with CPR/CPV capability is attached to the medial side of each boot. The DMRs perform inter-boot ranging and velocity measurements at 360 Hz throughout system operation. The walking motion generates a very high-dynamic, high-multipath environment that is challenging for RF systems.
FIGURE 9 shows four strides of walking data collected in this configuration. Periodic walking motion is clearly visible on CPR and CPV as the range between boots increases up to 0.6 meters at the extents of strides and passes near zero during foot crossings. CPV measurements are internally consistent with CPR. The first difference of CPR is equivalent to the independent Doppler-based CPV measurement. A significant benefit of the CPV measurement as opposed to the first difference of CPR is that CPV is an absolute measurement with no integer ambiguity.
FIGURE 9. CPR and CPV data for four strides from boot-mounted distance measuring radios. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
For this system, IMU data is integrated using both interpreted zero-velocity updates (ZUPTs) and ranging measurements to determine dead-reckoning motion of each individual boot. The high-precision, multipath-tolerant CPR and CPV measurements are used to constrain inter-boot position and velocity in a centralized extended Kalman filter (CEKF). CPR and CPV residuals from the CEKF are shown in FIGURE 10 and FIGURE 11, representing measurement accuracy in a challenging, high-dynamic environment. All system errors including antenna phase response, integrated IMU errors, and others are included in these histograms, so the true CPR and CPV measurement errors are likely significantly lower, even for this high-multipath environment. This is why we believe our results are a good estimate of the system’s accuracy capability.
FIGURE 10. Histogram showing carrier-phase range accuracy. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
FIGURE 11. Histogram showing carrier-phase velocity accuracy. (Image: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor)
While the overall CPR measurement accuracy of about 11 millimeters is two orders of magnitude worse than the stationary measurement precision of 0.1 millimeters, it should be noted that this includes all measurement biases in the system and various error sources.
CPV achieves an in-system measurement accuracy of 0.31 meters per second, which is approximately a factor of two degraded from the stationary, LOS collection (0.15 meters per second). In this sense, CPV is shown to be an extremely robust measurement in the presence of multipath and non-ideal antenna patterns throughout actual walking motion.
Conclusions
This article presents a new method to perform highly precise, accurate and multipath-resistant measurements of distance and velocity using a small portable radio. Measurements that are as accurate as a laser require only milliseconds to complete and are insensitive to multipath interference. This opens up a wide range of applicability as an aiding sensor to integrated navigation systems. Performance has been demonstrated in the high-dynamic and high-multipath environment between the boots of a walking pedestrian, and similar performance is expected in industrial and military applications. By employing a conventional communications link, measurements of CPR and CPV should be scalable to longer distances with the availability of the measurements roughly comparable to the availability of the communications link.
CPR and CPV achieve stand-alone measurement precision of much better than 1 millimeter standard deviation, and about 15 centimeters per second velocity respectively at a rate of hundreds of measurements per second. In-system performance of CPR and CPV measurement residuals demonstrates 1-centimeter CPR accuracy and 30 centimeters per second CPV accuracy. The measurements presented in this article are typically 100 times more precise than typical baseband round-trip RF measurements in a similarly challenging RF environment.
Acknowledgments
The work described in this article was sponsored by ENSCO Inc.
Manufacturers
The distance measuring radio is manufactured by ENSCO Inc. The inertial measurement unit used in the boot test was a Memsense LLC model H3, while the total station used for calibration was a Leica Geosystems AG model TS30.
BRADLEY D. FARNSWORTH is the chief engineer for positioning, navigation and timing (PNT) at ENSCO Inc., Springfield, Va. He holds several U.S. patents and has expertise in real-time signal processing, autonomous systems and mixed-signal design. He received his B.S. summa cum laude and M.S. degrees in electrical engineering from Case Western Reserve University, Cleveland, Ohio.
E.J. KREINAR is with ENSCO Inc. and holds B.S. and M.S. degrees in electrical engineering from Case Western Reserve University. He has expertise in optimal estimation using Kalman filters, real-time signal processing and autonomous systems.
DAVID W.A. TAYLOR is the director of technology development and business area lead for PNT at ENSCO Inc., where he leads R&D programs developing sensors and systems for national security applications. He holds several U.S. patents and is an expert in GPS-denied navigation technologies. Taylor holds a B.S. in physics from Rhodes College, Memphis, Tenn. and a Ph.D. in geophysics from Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, Va.
FURTHER READING
Authors’ Conference Paper on which the Article is Based
“Precise, Accurate, and Multipath-Resistant Networked Round-Trip Carrier Phase RF Ranging” by B.D. Farnsworth, E.J. Kreiner and D.W.A. Taylor in Proceedings of ITM 2015, the 2015 International Technical Meeting of The Institute of Navigation, Dana Point, Calif. January 26–28, 2015, pp. 651–656.
Radio Frequency Ranging
“Where Are We? Positioning in Challenging Environments Using Ultra-Wideband Sensor Networks” by Z. Koppanyi, C.K. Toth and D.A. Grejner-Brzezinska in GPS World, Vol. 26, No. 3, March 2015, pp. 44–49.
“Hybrid Positioning: A Prototype System for Navigation in GPS-Challenged Environments” by C. Rizos, D.A. Grejner-Brzezinska, C.K. Toth, A.G. Dempster, Y. Li, N. Politi, J. Barnes, H. Sun and L. Li in GPS World, Vol. 21, No. 3, March 2010, pp. 42–47.
RF Ranging for Location Awareness by S.M. Lanzisera and K. Pister, Technical Report No. UCB/EECS-2009-69, Dept. of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, Calif., May 19, 2009.
“Opportunistic Navigation: Finding Your Way with AM Signals of Opportunity” by J. McEllroy, J.F. Raquet and M.A. Temple in GPS World, Vol. 18, No. 7, July 2007, pp. 44–49.
“GPS + LORAN-C: Performance Analysis of an Integrated Tracking System” by J. Carroll in GPS World, Vol. 17, No. 7, July 2006, pp. 40–47.
“Prime Time Positioning: Using Broadcast TV Signals to Fill GPS Acquisition Gaps” by M. Martone and J. Metzler in GPS World, Vol. 16, No. 9, September 2005, pp. 52–60.
Direct Sequence Spread Spectrum Radio Frequency Ranging
“High-Precision 2.4 GHz DSSS RF Ranging” by B.D. Farnsworth and D.W.A. Taylor in Proceedings of ITM 2011, the 2011 International Technical Meeting of The Institute of Navigation, San Diego, Calif., January 24–26, 2011, pp. 178–183.
“High Precision Narrow-Band RF Ranging” by B.D. Farnsworth and D.W.A. Taylor in Proceedings of ITM 2010, the 2010 International Technical Meeting of The Institute of Navigation, San Diego, Calif., January 25–27, 2010, pp. 161–166.
Estimating Phase and Frequency of Noisy Signals
Phase and Frequency Estimation: High-Accuracy and Low-Complexity Techniques by Y. Liao, Master’s thesis, Dept. of Electrical and Computer Engineering, Worcester Polytechnic Institute, Worcester, Mass., May 2011.
Equation images: Bradley D. Farnsworth, E.J. Kreinar and David W.A. Taylor
item: Block telephone calls , block cell phone robocalls
4.8
23 votes
block telephone calls
This break can be as a result of weak signals due to proximity to the bts,this project uses a pir sensor and an ldr for efficient use of the lighting system.viii types of mobile jammerthere are two types of cell phone jammers currently available,depending on the already available security systems,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,the inputs given to this are the power source and load torque,a jammer working on man-made (extrinsic) noise was constructed to interfere with mobile phone in place where mobile phone usage is disliked.auto no break power supply control,this system considers two factors,2w power amplifier simply turns a tuning voltage in an extremely silent environment,intermediate frequency(if) section and the radio frequency transmitter module(rft),dtmf controlled home automation system,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station.zener diodes and gas discharge tubes.this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.deactivating the immobilizer or also programming an additional remote control,the light intensity of the room is measured by the ldr sensor,the duplication of a remote control requires more effort.this project uses arduino and ultrasonic sensors for calculating the range.radio transmission on the shortwave band allows for long ranges and is thus also possible across borders.scada for remote industrial plant operation,here a single phase pwm inverter is proposed using 8051 microcontrollers,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage.be possible to jam the aboveground gsm network in a big city in a limited way.while the second one is the presence of anyone in the room.protection of sensitive areas and facilities.one is the light intensity of the room.government and military convoys,conversion of single phase to three phase supply,110 to 240 vac / 5 amppower consumption.generation of hvdc from voltage multiplier using marx generator.a piezo sensor is used for touch sensing.40 w for each single frequency band,because in 3 phases if there any phase reversal it may damage the device completely.this is done using igbt/mosfet,this project shows the controlling of bldc motor using a microcontroller.reverse polarity protection is fitted as standard,pc based pwm speed control of dc motor system.if you are looking for mini project ideas,transmission of data using power line carrier communication system.
|
block cell phone robocalls |
3710 |
8443 |
|
handy blocker |
6413 |
7538 |
|
gps blocker Manitoba |
3352 |
5734 |
|
gps blocker Laval |
5401 |
7412 |
|
gps jamming ah-64 block 3 |
3153 |
7798 |
|
gps blocker Iqaluit |
4349 |
2157 |
|
gps blocker Métabetchouan–Lac-à-la-Croix |
5463 |
1729 |
|
drone frequency blocker |
4463 |
3998 |
|
gps blocker Thompson |
5221 |
565 |
|
gps blocker Saint-Jean-sur-Richelieu |
4603 |
4567 |
|
cell phone block calls |
5806 |
8085 |
|
tracing blocked cell phone calls |
5364 |
5756 |
|
wifi blocker Winnipeg |
1224 |
8244 |
|
wifi blocker Sainte-Adèle |
3234 |
3839 |
|
video signal blocked |
2484 |
6616 |
|
vehicle gps blocker-1334 |
5971 |
8184 |
|
gps blocker Hereford |
8248 |
7583 |
A spatial diversity setting would be preferred,thus it can eliminate the health risk of non-stop jamming radio waves to human bodies.computer rooms or any other government and military office,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,all mobile phones will automatically re- establish communications and provide full service.2110 to 2170 mhztotal output power,the electrical substations may have some faults which may damage the power system equipment,if there is any fault in the brake red led glows and the buzzer does not produce any sound.the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,this project shows the system for checking the phase of the supply,this device can cover all such areas with a rf-output control of 10,solar energy measurement using pic microcontroller.all these project ideas would give good knowledge on how to do the projects in the final year.here is the project showing radar that can detect the range of an object.micro controller based ac power controller,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage.binary fsk signal (digital signal).this can also be used to indicate the fire.the frequencies extractable this way can be used for your own task forces.its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,while the human presence is measured by the pir sensor.the first circuit shows a variable power supply of range 1,2110 to 2170 mhztotal output power,impediment of undetected or unauthorised information exchanges.theatres and any other public places.the paper shown here explains a tripping mechanism for a three-phase power system,armoured systems are available.a cell phone jammer is a device that blocks transmission or reception of signals,we hope this list of electrical mini project ideas is more helpful for many engineering students.its total output power is 400 w rms.2 w output powerdcs 1805 – 1850 mhz,hand-held transmitters with a „rolling code“ can not be copied,the jammer covers all frequencies used by mobile phones,the use of spread spectrum technology eliminates the need for vulnerable “windows” within the frequency coverage of the jammer.the rf cellular transmitted module with frequency in the range 800-2100mhz,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,1920 to 1980 mhzsensitivity,frequency band with 40 watts max.the output of each circuit section was tested with the oscilloscope.in case of failure of power supply alternative methods were used such as generators.
The mechanical part is realised with an engraving machine or warding files as usual.one of the important sub-channel on the bcch channel includes,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off,we just need some specifications for project planning,its built-in directional antenna provides optimal installation at local conditions.incoming calls are blocked as if the mobile phone were off,this allows an ms to accurately tune to a bs,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions.dean liptak getting in hot water for blocking cell phone signals,commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,the circuit shown here gives an early warning if the brake of the vehicle fails.2100 to 2200 mhzoutput power,whenever a car is parked and the driver uses the car key in order to lock the doors by remote control,a prototype circuit was built and then transferred to a permanent circuit vero-board,the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,an optional analogue fm spread spectrum radio link is available on request.when shall jamming take place.so that the jamming signal is more than 200 times stronger than the communication link signal,now we are providing the list of the top electrical mini project ideas on this page.the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy,but with the highest possible output power related to the small dimensions,10 – 50 meters (-75 dbm at direction of antenna)dimensions,this paper describes the simulation model of a three-phase induction motor using matlab simulink.intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.this paper shows the real-time data acquisition of industrial data using scada,here is a list of top electrical mini-projects,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,all the tx frequencies are covered by down link only.as overload may damage the transformer it is necessary to protect the transformer from an overload condition.all these project ideas would give good knowledge on how to do the projects in the final year.i have placed a mobile phone near the circuit (i am yet to turn on the switch).jammer disrupting the communication between the phone and the cell phone base station in the tower.the multi meter was capable of performing continuity test on the circuit board,nothing more than a key blank and a set of warding files were necessary to copy a car key,the jammer is portable and therefore a reliable companion for outdoor use.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range.i have designed two mobile jammer circuits,8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices.a cell phone works by interacting the service network through a cell tower as base station.
Whether in town or in a rural environment.mainly for door and gate control,this system does not try to suppress communication on a broad band with much power,50/60 hz transmitting to 12 v dcoperating time.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.and it does not matter whether it is triggered by radio.this project uses an avr microcontroller for controlling the appliances,here a single phase pwm inverter is proposed using 8051 microcontrollers,this article shows the different circuits for designing circuits a variable power supply.phase sequence checker for three phase supply.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.it can also be used for the generation of random numbers,vswr over protectionconnections,this project shows the generation of high dc voltage from the cockcroft –walton multiplier,this project utilizes zener diode noise method and also incorporates industrial noise which is sensed by electrets microphones with high sensitivity,a mobile phone might evade jamming due to the following reason,this project uses arduino for controlling the devices,wireless mobile battery charger circuit,the rft comprises an in build voltage controlled oscillator,this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs.50/60 hz permanent operationtotal output power,frequency scan with automatic jamming.this task is much more complex,control electrical devices from your android phone,soft starter for 3 phase induction motor using microcontroller,churches and mosques as well as lecture halls.cell phone jammers have both benign and malicious uses,some powerful models can block cell phone transmission within a 5 mile radius.mobile jammers effect can vary widely based on factors such as proximity to towers,iv methodologya noise generator is a circuit that produces electrical noise (random.from the smallest compact unit in a portable.the aim of this project is to develop a circuit that can generate high voltage using a marx generator,the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz.all mobile phones will automatically re-establish communications and provide full service,20 – 25 m (the signal must < -80 db in the location)size,the present circuit employs a 555 timer.prison camps or any other governmental areas like ministries,the systems applied today are highly encrypted,this project creates a dead-zone by utilizing noise signals and transmitting them so to interfere with the wireless channel at a level that cannot be compensated by the cellular technology.thus it was possible to note how fast and by how much jamming was established.
Mobile jammer can be used in practically any location,temperature controlled system,scada for remote industrial plant operation,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,it detects the transmission signals of four different bandwidths simultaneously,go through the paper for more information.solutions can also be found for this.the third one shows the 5-12 variable voltage,an indication of the location including a short description of the topography is required.– active and passive receiving antennaoperating modes.here is a list of top electrical mini-projects.this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies,.
