CN202794534U - Automatic testing system for interference resistance of Beidou receiver - Google Patents
Automatic testing system for interference resistance of Beidou receiver Download PDFInfo
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- CN202794534U CN202794534U CN 201220475977 CN201220475977U CN202794534U CN 202794534 U CN202794534 U CN 202794534U CN 201220475977 CN201220475977 CN 201220475977 CN 201220475977 U CN201220475977 U CN 201220475977U CN 202794534 U CN202794534 U CN 202794534U
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Abstract
The utility model provides an automatic testing system for interference resistance of a Beidou receiver. A satellite signal and interference signal simulation source receives set parameters transmitted by an upper computer, simulates the movement trace and the state of a user and generates Beidou navigation signals and various intermediate frequency interference digital signals according to preset ephemeris parameters, the generated Beidou navigation signals and various interference signals are transmitted from different positions and along different directions after DA (data analysis), up-conversion and power regulation, the tested receiver is placed on a rotating platform, rotates along with the same, simultaneously receives the Beidou navigation signals and the interference signals, completes signal interference resisting, signal processing and navigation calculation and outputs positioning results corresponding to interference modes to the upper computer, and the upper computer evaluates the interference resistance of the receiver and outputs evaluation results. The automatic testing system not only can test the interference resistance of the receiver in a time domain and a frequency domain, but also can test the interference resistance of the receiver in a space domain.
Description
Technical field
The utility model relates to the satellite navigation field, is specifically related to a kind of Beidou receiver interference free performance Auto-Test System.
Background technology
Satellite navigation has been penetrated into the links of modern war, become the strong means that obtain military superiority even capture the triumph of fighting, each link at course of war is being brought into play irreplaceable effect, the jammer satellite navigation not only can destroy the accurate attack of stealth aircraft, cruise missile and other operational aircrafts, also can destroy the operational coordination between them, can play important effect to the triumph of antiair warfare.As continuous perfect, a powerful navigation positioning system, the Big Dipper (BD) will brought into play huge power in the information war of in the high-tech, but also constantly expose the weakness of self simultaneously, be faced with various challenges.Only be recognized, solve the variety of issue of the Interferenc and anti interference that comprises the BD signal, just might in future war, have the initiative, leading position.If most modernization guided weapon adopts satellite navigation system to accomplish to disturb enemy army's guided weapon more, can not be disturbed by the enemy army one's own side's guided weapon purpose again, just require BD to disturb with defruiter equipment and all will have, could in actual combat, obtain initiative.Therefore, need to carry out intensive research to the BD countermeasure techniques in the guidance station, farthest slacken enemy's navigation fight capability, improve to greatest extent our homing capability, grasp the initiative of future battlefield.
Present effective, the most most economical mode of satellite navigation interference is the interference to navigation neceiver, and its jamming pattern mainly contains three classes: pressing type disturbs, the deception formula is disturbed and pulsed is disturbed.Concrete jamming signal type is varied, such as arrowband/broadband signal, wideband Gaussian noise, single-tone continuous wave, swept continuous wave, pulsed continuous wave, sawtooth wave, modulating wave etc.
For the top interference source of saying, the Anti-Jamming Technique of satellite navigation receiver also roughly can be divided into 3 classes: auto-adaptive filtering technique, anti-interference based on Anti-Jamming Technique and the receiver signal processing of antenna.Every kind of jamproof technology has its superiority-inferiority, Accurate Measurement receiver antijamming capability how, to the research of the interference mitigation technology of satellite navigation system, the development of China BD2 is had important using value, and provide theory of testing support and data and test foundation for it.
The utility model content
Technical problem to be solved in the utility model provides a kind of Beidou receiver interference free performance Auto-Test System, it not only can the antijamming capability of testing evaluation Beidou receiver on time domain and frequency domain, but also can the antijamming capability of test receiver on the spatial domain, and can provide with the form of form the testing evaluation result.
For addressing the above problem, the utility model is realized by following scheme:
A kind of Beidou receiver interference free performance Auto-Test System mainly is comprised of host computer, satellite-signal and undesired signal dummy source, rotatable platform and tested receiver; Wherein satellite-signal and undesired signal dummy source comprise DSP message processing module, FPGA signal processing module, multichannel DA modular converter, multi-channel rf module and a plurality of emitting antenna; Host computer connects the DSP message processing module, DSP message processing module and FPGA signal processing module interconnect, the output terminal of FPGA signal processing module is divided into multichannel, each road all is connected with one road radio-frequency module via one road DA modular converter, all is connected with an emitting antenna on each road radio-frequency module; Above-mentioned a plurality of emitting antenna around be arranged on rotatable platform around; Tested receiver is placed on rotatable platform and follows the rotatable platform motion, and the motion control end of rotatable platform is connected on the output terminal of host computer; The input end of tested receiver receives the signal from satellite-signal and the transmission of undesired signal dummy source; The output terminal of tested receiver is connected with the input end of host computer.
Host computer: finish the setting of control parameter, parameter display and anti-jamming performance evaluation result and deposit; The control parameter that wherein arranges comprises user movement scene, simulation time, ephemeris file, error mode and jamming pattern;
The DSP message processing module of satellite-signal and undesired signal dummy source: according to the user movement scene that host computer is sent, the movement locus of analog subscriber in simulation time; Extract ephemeris parameter and finish the decoding of Big Dipper navigation message according to the ephemeris file; Set up the positional information of satellite and in conjunction with the movement locus of user in simulation time, judge visible star according to ephemeris parameter; According to the error mode error of calculation and loading error source;
The FPGA signal processing module of satellite-signal and undesired signal dummy source: be assigned to corresponding signal for every visible satellite and generate passage, and according to the original carrier phase place of the corresponding emulation with satellite position calculation of customer location each channel signal constantly, initial pseudo-code phase and initial carrier frequency; Generate corresponding carrier wave, code and telegraph signal according to frequency information again, and finish Pseudo Code Spread Spectrum modulation and carrier modulation, generate Big Dipper digital intermediate frequency signal; And then according to the interference source pattern that host computer arranges, after adopting Direct Digital Synthesizer to process, Big Dipper digital intermediate frequency signal generates various intermediate frequency digital interference signals to generating;
The multichannel DA modular converter of satellite-signal and undesired signal dummy source: separately road signal in Big Dipper digital intermediate frequency signal and the various intermediate frequency digital interference signal is carried out sending in the corresponding radio-frequency module after the digital-to-analog conversion;
The multi-channel rf module of satellite-signal and undesired signal dummy source: the analog intermediate frequency signal after the logarithmic mode conversion upconverts to Big Dipper rf frequency respectively, generates multichannel Big Dipper radiofrequency signal;
A plurality of emitting antennas of satellite-signal and undesired signal dummy source: respectively multichannel Big Dipper emission of radio frequency signals is gone out;
Tested receiver: road satellite-signal and multichannel undesired signal that while receiving satellite signal and undesired signal dummy source are launched, and finish Anti-jamming of signal processing, signal are processed and navigation calculation, corresponding positioning result is to host computer under the output disturbance pattern;
Host computer: the antijamming capability of the positioning result comprehensive assessment terminal of returning according to tested receiver, final assessment result is with form storage and the output of icon or file.
In the said system, the jamming pattern of host computer setting comprises cheating interference pattern, compacting jamming pattern and impulse disturbances pattern.
In the said system, host computer is caught anti-interference thresholding and code tracking anti-interference thresholding with the undesired signal dummy source at different satellite-signal output powers, different jamming pattern and the anti-interference thresholding of demodulation under the satellite interference signal frequency condition, codes at satellite-signal by the statistics and analysis tested receiver, assesses the interference free performance of tested receiver.
Compared with prior art, the utility model has made up one by host computer, satellite-signal and undesired signal dummy source, tested receiver and rotatable platform test macro, and the host computer of this system is finished parameter setting, parameter display and anti-jamming performance evaluation result and deposited; Satellite-signal and undesired signal dummy source receive the parameters that host computer is sent, analog subscriber track and motion state, and according to default ephemeris parameter generation Beidou satellite navigation signal and various interference digital intermediate frequency signal; The big-dipper satellite digital intermediate frequency signal that generates is launched from the top, sky of receiver by antenna after DA, up-conversion and power adjustments, the multiple undesired signal that generates is also passed through respectively antenna after DA, up-conversion and power adjustments, launch from diverse location and orientation; Tested receiver is placed on the rotatable platform, and this rotatable platform not only can be done by host computer and horizontally rotate, and regulates but also can do pitching, roll and orientation 3 d pose; Beidou receiver is receiving satellite signal and a plurality of undesired signal simultaneously, and finish Anti-jamming of signal processing, signal are processed and navigation calculation, corresponding positioning result under the output disturbance pattern, and outputing to host computer by serial ports, host computer is finished anti-interference of receiver and can be assessed, and the formal output of assessment result with icon or file.Therefore, this system not only can test receiver at the antijamming capability of time domain and frequency domain, and can also test receiver at the antijamming capability in spatial domain.
Description of drawings
Fig. 1 is a kind of layout of Beidou receiver interference free performance Auto-Test System;
Fig. 2 is a kind of schematic diagram of Beidou receiver interference free performance Auto-Test System;
Fig. 3 is the composition diagram of satellite-signal and undesired signal dummy source.
Embodiment
Referring to Fig. 1, a kind of Beidou receiver Anti-Interference Automatic Test Equipment mainly is made of host computer, satellite-signal and undesired signal dummy source, tested receiver and rotatable platform.Wherein satellite-signal and undesired signal dummy source comprise DSP message processing module, FPGA signal processing module, multichannel DA modular converter, multi-channel rf module and a plurality of emitting antenna.Host computer connects the DSP message processing module, DSP message processing module and FPGA signal processing module interconnect, the output terminal of FPGA signal processing module is divided into multichannel, each road all is connected with one road radio-frequency module via one road DA modular converter, all is connected with an emitting antenna on each road radio-frequency module.Above-mentioned a plurality of emitting antenna around be arranged on rotatable platform around.Tested receiver is placed on rotatable platform and follows the rotatable platform motion.The input end of tested receiver receives the signal from satellite-signal and the transmission of undesired signal dummy source.The output terminal of tested receiver is connected with the input end of host computer.Host computer passes through the parameter settings such as upper computer software completing user moving scene, interference source, error source, and issues satellite-signal and undesired signal dummy source by serial ports; Satellite-signal and undesired signal dummy source receive the generation of finishing Big Dipper satellite signal and undesired signal after these parameters; The Big Dipper satellite signal that generates is launched from the top, sky of receiver by antenna, and the multiple undesired signal of generation by antenna, is launched from diverse location and orientation respectively; Tested receiver is placed on the rotatable platform, and this rotatable platform can be done and horizontally rotate and the 3 d poses adjustings such as pitching, roll and orientation; Tested receiver is receiving satellite signal and a plurality of undesired signal simultaneously, and finish Anti-jamming of signal processing, signal are processed and navigation calculation, corresponding positioning result is to host computer under the output disturbance pattern, thereby the antijamming capability of comprehensive assessment terminal, final assessment result is with the formal output of icon or file.
Beidou receiver Anti-Interference Automatic Test Equipment principle synoptic diagram as shown in Figure 2, host computer is finished control parameter setting, parameter display and anti-jamming performance evaluation result and is deposited; Satellite-signal and undesired signal dummy source receive the control parameter that host computer is sent, analog subscriber track and motion state, and finish Big Dipper navigation message according to default ephemeris parameter and encode, position, speed according to user's position, speed and satellite, Calculation of Satellite is to user's pseudorange and pseudorange rates, judge visible star, and loading error source (ionosphere, troposphere and earth autobiography effect equal error); Code NCO generates, carrier wave NCO generate after respectively with navigation message band spectrum modulation and carrier modulation, the signal after the modulation is gone out by antenna transmission through DA, up-conversion and power conditioning module; Undesired signal comprises cheating interference signal (deceiving jamming signal and production cheating interference signal), pressing type undesired signal (frequency sweep undesired signal, white noise undesired signal, single-tone undesired signal, sawtooth wave undesired signal and modulation signal undesired signal etc.) and pulse interference signal (chirp undesired signal and binary coding modulating pulse undesired signal); Each road undesired signal becomes Radio Frequency Interfere respectively after AD, up-conversion and power adjustments, and goes out through antenna transmission respectively; Beidou receiver receiving satellite signal and undesired signal, and the positioning result of receiver outputed to host computer by serial ports, finally finish the anti-jamming performance evaluation of receiver.
The below is each ingredient of detailed introducing system respectively:
1. host computer
Host computer can be realized the initial parameter setting of system; Can realize the serial communication of host computer and dummy source; Can realize power control and the setting of output signal; Can show in real time the satellite channel situation; Interference source arranges and the anti-jamming performance evaluation result shows.
The parameter of host computer arranges and mainly finishes following work: scene generates the parameter setting: longitude, latitude and the height three-dimensional position of setting the user; Set east orientation, the north orientation and high to three-dimensional velocity of user movement; Arrange whether add ionospheric error emulation and tropospheric error emulation, and set elevation angle thresholding; Arrange and whether load " ephemeris file "; Emulation " initial time " is set; Set the carrier track, and select type of sports, such as selected uniform motion, uniformly accelerated motion, varying accelerated motion, flat bank, circular motion etc.; Undesired signal type and interference parameter are set.
Host computer can be realized the serial communication of host computer and dummy source: the parameters that upper computer software produces is according to certain communication protocol, form with frame format sends to the signal imitation source by serial ports RS232 interface, load mode is bulk transfer, namely is used for transmitting a kind of load mode of a large amount of data.Its effect mainly contains two: the one, and the simulating scenes according to the user sets divides transmitted signal status information parameter and various control command parameter to signal imitation source digital processes; The 2nd, from signal imitation source baseband portion and receiver, read respectively various information datas, in upper computer software, show in real time.
Host computer can realize that the satellite channel state shows: the data that the DSP message processing module in Satellite Signal Source calculates in real time at regular intervals, send to upper computer software, correspondingly calculate in real time the information such as the elevation angle, position angle, pseudorange of each visible star; Be about to channel status information decoding and demonstration that the Satellite Signal Source hardware device sends.Main channel status judgement and the current use passage realized reads; Customer location receives and conversion; Every satellite position receives and conversion; Satellite and user's relative position calculate; Its computation of pseudoranges.And according to the elevation angle decision threshold of satellite, simulate each constantly all visible satellite of receiver, and by showing in real time.
Host computer can be to realize output signal power control: in the signal imitation process, arbitrarily the signal power of each visible star is controlled and adjusted to the passage of each satellite-signal of opening/closing and undesired signal with this.Regulate the power of each visible star and undesired signal, power-adjustable demonstration figure shows different colors according to the size of power, this module can be closed arbitrarily the power control of visible star simultaneously, can calculate and show the power that each visible satellite is current, also can calculate respectively with relative value and absolute value.
Host computer realizes that interference source setting and anti-jamming performance evaluation result deposit: can the rotatable platform parameter be set by host computer, such as the rotational angle of rotatable platform, speed, cycle etc.; Can realize interference source type selection and parameter setting, interference source type can be selected, such as pressing type interference, pulse interference signal, cheating interference signal etc.And various interference sources can arbitrarily make up, and the parameter of interference source can arrange such as signal pulse cycle, pulse width etc.Anti-jamming performance evaluation can come interference free performance is assessed with disturbing scene setting according to the receiving terminal positioning result, and the result who assesses is deposited with the form of form or file.Anti-jamming performance evaluation is used on the one hand setting signal and disturbs layout, and on the other hand, the result who reports according to receiving terminal comes interference free performance is assessed with signal interference scene.
2. satellite-signal and undesired signal dummy source
At first according to the movement position, the temporal information that obtain in real time carrier, extrapolation satellite ephemeris and almanac carry out the navigation message coding.According to the observability of carrier and intersatellite relative position analysis satellite, reject sightless star.To visible star, according to the relative motion information between itself and motion carrier, calculate pseudorange, pseudorange rates between them, and call the filling that various error models carry out error, obtained to add ionospheric error, tropospheric error, earth rotation effect errors equal error pseudorange afterwards.Carry out the generation of pseudo-code and carrier wave according to pseudorange and pseudorange rates, pseudo-code and navigation message carry out carrying out carrier modulation with carrier wave again after the band spectrum modulation, the synthetic digital intermediate frequency signal that just obtains of the signal after the multichannel modulation.The digital intermediate frequency signal that generates can generate the satellite-signal that carrier is received after DA digital-to-analog conversion, up-conversion and power adjustments.
Simulation produces pressing type undesired signal, pulse interference signal and deception formula undesired signal.Wherein, the pressing type undesired signal comprises frequency sweep undesired signal, single-frequency undesired signal, modulated interferer signal, white noise undesired signal and sawtooth wave undesired signal; Pulse interference signal comprises chirp undesired signal and binary coding modulating pulse undesired signal; Deception formula undesired signal comprises production cheating interference signal and deceiving jamming signal.
In the utility model, the each several part of satellite-signal and undesired signal dummy source forms as shown in Figure 3, and it includes DSP message processing module, FPGA signal processing module, multichannel DA modular converter, multi-channel rf module and a plurality of emitting antenna.Wherein
The major function of DSP message processing module comprises: finish navigation message decoding and ephemeris parameter and extract; Calculate position, the speed of institute's analog satellite according to ephemeris parameter, and in conjunction with position, speed, the temporal information of carrier, set up satellite information.And then extrapolate the essential informations such as satellite-signal propagation delay and Doppler shift; Set up various error models, mainly comprise ionospheric error, tropospheric error, earth rotation error etc., according to the model error of calculation; According to the carrier movement trajectory parameters that host computer provides, carry out pseudo-code and carrier wave NCO simulation.
The major function of FPGA signal processing module comprises: the artificial intelligences such as channel Control and current analogue navigation telegraph text data and phase delay are extracted, and generate simultaneously current channel state and NCO analog correction data; The pseudo-code of navigation satellite signal and carrier generator realize, comprises that the emulation passage realizes that pseudo-code can join flexibly, and initial code phase positions and carrier phase setting; The settings such as the NCO phase place of various undesired signals, carrier parameter, frequency control word; The realization of high dynamic signal code NCO and carrier wave NCO is finished the pseudo-code of navigation message and is modulated and carrier modulation, finishes the undesired signal modulation; Finish the modulation of each passage digital medium-frequency signal of simulator and the time delay setting that the deception formula is disturbed; Receive the power control instruction that host computer sends, realize the power control of modulation signal; Finish the initial and control register setting of D/A analog-digital chip; Data communication between completion system comprises the serial port drive design, the transmission that reads and writes data, reception and buffer memory.
Multichannel DA modular converter: be mainly used in the north of a road bucket digital intermediate frequency signal and the multichannel Big Dipper intermediate frequency digital interference signal that generate are carried out becoming north of a road bucket analog intermediate frequency signal and multichannel Big Dipper intermediate frequency simulaed interference signal after the mould conversion.In the present embodiment, described DA modular converter is 8 the tunnel.
Multi-channel rf module: be mainly used in finishing up-conversion local oscillator and the output power adjusting of intermediate frequency simulation satellite signal and undesired signal, the design of system need to be satisfied signal amplitude (simulator amplitude output signal precision, accuracy, variation range), mutually make an uproar index, frequency stability, the index requests such as signal bandwidth, radio-frequency module are all realized by analog device.In the present embodiment, described radio-frequency module is 8 the tunnel.
A plurality of emitting antennas: the Big Dipper satellite signal that is mainly used in generating is launched from the top, sky of receiver by antenna, and the multiple undesired signal of generation by antenna, is launched from diverse location and orientation respectively.Wherein comprise a satellite-signal antenna and a plurality of potato masher antenna in a plurality of emitting antennas.Above-mentioned a plurality of emitting antenna can with annular, square or other are regular or irregular shape be looped around tested receiver around.In the present embodiment, described emitting antenna is 8, and wherein 1 is the satellite-signal antenna, and 7 is potato masher antenna.These 8 emitting antennas be circular be looped around tested receiver around.
3. tested receiver
Tested equipment in this task, should have sky, the time and the frequency domain antijamming capability.Tested receiver is in test process, road satellite-signal and multichannel undesired signal that while receiving satellite signal and undesired signal dummy source are launched, and finish Anti-jamming of signal processing, signal are processed and navigation calculation, corresponding positioning result is to host computer under the output disturbance pattern.
4. rotatable platform
Tested receiver is placed on the rotatable platform, and rotatable platform namely can independent regulation, also can do to horizontally rotate and pitching, roll and orientation 3 d pose are regulated under the control of host computer.
The Beidou receiver interference free performance automatic test approach that the Beidou receiver interference free performance Auto-Test System of employing said structure realizes comprises the steps:
(1) host computer arranges the control parameters such as user movement scene, simulation time, ephemeris file, error mode and jamming pattern, and by serial ports above-mentioned parameters is handed down to satellite-signal and undesired signal dummy source;
(2) the DSP message processing module of satellite-signal and undesired signal dummy source, according to the user movement scene that host computer is sent, the movement locus of analog subscriber in simulation time; Extract ephemeris parameter and finish the decoding of Big Dipper navigation message according to the ephemeris file; Set up the positional information of satellite and in conjunction with the movement locus of user in simulation time, judge visible star according to ephemeris parameter; According to the error mode error of calculation and loading error source;
(3) the FPGA signal processing module of satellite-signal and undesired signal dummy source,
At first, be assigned to corresponding signal for every visible satellite and generate passage, and according to the original carrier phase place of the corresponding emulation with satellite position calculation of customer location each channel signal constantly, initial pseudo-code phase and initial carrier frequency; Generate corresponding carrier wave, code and telegraph signal according to frequency information again, and finish Pseudo Code Spread Spectrum modulation and carrier modulation, generate Big Dipper digital intermediate frequency signal.
Then, the interference source pattern according to host computer arranges generates various intermediate frequency digital interference signals to generating after Big Dipper digital intermediate frequency signal adopts Direct Digital Synthesizer to process.Wherein, jamming pattern mainly contains: pressing type disturbs (comprising: single-tone continuous wave undesired signal, swept continuous wave, modulated interferer signal, modulated spread spectrum signal, white noise undesired signal), pulse interference signal (comprising that chirp disturbs or binary coding modulating pulse undesired signal), cheating interference signal (comprising production cheating interference and deceiving jamming) etc.
(4) the multichannel DA modular converter of satellite-signal and undesired signal dummy source carries out digital-to-analog conversion to the Big Dipper digital intermediate frequency signal of production in the step (3) and road signal in the various intermediate frequency digital interference signal respectively;
(5) the multi-channel rf module of satellite-signal and undesired signal dummy source, the analog intermediate frequency signal after the logarithmic mode conversion upconverts to Big Dipper rf frequency respectively, generates multichannel Big Dipper radiofrequency signal;
(6) the multichannel emitting antenna of satellite-signal and undesired signal dummy source is gone out multichannel Big Dipper emission of radio frequency signals respectively;
(7) tested receiver receiving satellite signal and undesired signal dummy source one road satellite-signal and the multichannel undesired signal of launching simultaneously, and finish Anti-jamming of signal processing, signal are processed and navigation calculation, corresponding positioning result is to host computer under the output disturbance pattern;
(8) power of the via satellite satellite-signal of signal and undesired signal dummy source output, and set different jamming signal types and be adjusted into satellite interference signal power, the anti-interference thresholding of demodulation of host computer statistics and analysis receiver, code are caught anti-interference thresholding and the anti-interference thresholding of code tracking, and generation statistics file, finally assess the interference free performance of tested receiver, final assessment result is with form storage and the output of icon or file.
Claims (1)
1. Beidou receiver interference free performance Auto-Test System is characterized in that: mainly be comprised of host computer, satellite-signal and undesired signal dummy source, rotatable platform and tested receiver; Wherein satellite-signal and undesired signal dummy source comprise DSP message processing module, FPGA signal processing module, multichannel DA modular converter, multi-channel rf module and a plurality of emitting antenna; Host computer connects the DSP message processing module, DSP message processing module and FPGA signal processing module interconnect, the output terminal of FPGA signal processing module is divided into multichannel, each road all is connected with one road radio-frequency module via one road DA modular converter, all is connected with an emitting antenna on each road radio-frequency module; Above-mentioned a plurality of emitting antenna around be arranged on rotatable platform around; Tested receiver is placed on rotatable platform and follows the rotatable platform motion; The input end of tested receiver receives the signal from satellite-signal and the transmission of undesired signal dummy source; The output terminal of tested receiver is connected with the input end of host computer.
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| GB2540536B (en) * | 2015-06-24 | 2021-07-21 | Nottingham Scient Limited | Method of testing a PNT configuration |
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| US11575407B2 (en) | 2020-04-27 | 2023-02-07 | Parsons Corporation | Narrowband IQ signal obfuscation |
| CN112788627A (en) * | 2020-12-28 | 2021-05-11 | 中国人民解放军63861部队 | Method and device for evaluating comprehensive anti-interference performance of point-to-point communication system |
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| US11849347B2 (en) | 2021-01-05 | 2023-12-19 | Parsons Corporation | Time axis correlation of pulsed electromagnetic transmissions |
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