An electromagnetic situation awareness evaluation system for electronic countermeasure equipment test training

Abstract

The present application relates to a kind of electromagnetic situation awareness evaluation systems for electronic countermeasure equipment test training, space radiation signal is received in all directions by sky server feed branch system;Radio frequency branch system carries out first-order frequency conversion processing to radiation source signal, and outputs wideband radio frequency signal, carries out second-order frequency conversion processing and outputs intermediate frequency signal;Intermediate frequency signal acquisition branch system acquires and stores baseband data;Signal monitoring recording branch system carries out acquisition analysis to the time domain and frequency domain data of wideband radio frequency signal, evaluates electromagnetic situation;Full-band calibration branch system calibrates the function and performance of system;Data postmortem analysis processing branch system completes big data high-speed transfer, offline analysis and evaluation processing.The present application solves the problem that there is no real-time recording and situation awareness evaluation means for the working state of participating countermeasure equipment radiation source in the process of electronic countermeasure equipment test training, especially when test effect is poor, it cannot quantitatively and bidirectionally determine the participating countermeasure equipment.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic monitoring technology and relates to an electromagnetic situational awareness and assessment system for the testing and training of electronic countermeasures equipment. Background Technology

[0002] During electronic warfare equipment testing or training, the frequency-using equipment is dense, and the types of electromagnetic signals are complex, mainly from various radar, communication, and jamming electromagnetic signals radiated by electronic equipment on different platforms such as aircraft and ground, resulting in an exceptionally complex electromagnetic environment. To ensure the smooth conduct of the test mission, it is necessary to conduct full-process electromagnetic situational awareness and assessment before, during, and after the entire confrontation test. In particular, the recording of the working status of the radiation sources of both sides during the process is crucial for the quantitative evaluation of the test results. Currently, each participating piece of equipment has the ability to monitor and record the signals of its own radiation sources, but there is a lack of an adjudicator to simultaneously monitor, analyze, evaluate, and record the status of both sides under the test conditions. If conventional radio monitoring systems are used for monitoring and evaluation, their monitoring focus is on monitoring the electromagnetic environment of the entire test area and its surroundings. The ability to analyze and process the complex radiation source signals of both sides under the test in real time, both online and offline, is insufficient. Especially when the test results are unsatisfactory, the monitoring results cannot be used as reference data for the adjudication of the two sides due to the lack of high-precision self-calibration. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training. This system is capable of performing full-process, high-precision electromagnetic awareness and assessment of complex confrontation tests, and can provide scientific and quantitative reference data for adjudication by both sides when the test results are unsatisfactory.

[0004] The technical solution of this invention is:

[0005] An electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training includes an antenna feeder subsystem, a radio frequency (RF) subsystem, an intermediate frequency (IF) signal acquisition subsystem, a signal monitoring and recording subsystem, a full-band calibration subsystem, and a post-processing data analysis subsystem. The RF subsystem includes a primary frequency converter, an RF channel splitter, and a secondary frequency converter. The signal monitoring and recording subsystem includes a time-domain waveform acquisition and analysis device and a frequency-domain waveform acquisition and analysis device.

[0006] The space-based feeder system is used to receive signals from space radiation sources and transmit them to the radio frequency subsystem.

[0007] The radio frequency subsystem performs a first-stage frequency conversion on the radiation source signal and outputs a broadband radio frequency signal. The broadband radio frequency signal is split into three paths by the radio frequency channel splitter. One path is output to the second-stage frequency conversion device, which performs down-conversion processing and outputs an intermediate frequency signal to the intermediate frequency signal acquisition subsystem. The other two paths are output to the time domain waveform acquisition and analysis device and the frequency domain waveform acquisition and analysis device of the signal monitoring and recording subsystem, respectively.

[0008] The intermediate frequency signal acquisition subsystem completes the acquisition of raw data and real-time disk storage; wherein, the raw data is baseband data obtained from the intermediate frequency signal;

[0009] The signal monitoring and scoring system completes the acquisition and real-time analysis of time-domain and frequency-domain data of broadband radio frequency signals, and realizes parameter measurement, statistical analysis and electromagnetic situation display of broadband radio frequency signals;

[0010] The full-band calibration subsystem completes the functional and performance calibration of the electromagnetic situational awareness and assessment system itself.

[0011] The data post-event analysis and processing subsystem receives and stores the raw acquisition data and monitoring data from the intermediate frequency signal acquisition subsystem for offline big data analysis and post-event evaluation. This enables a signal analysis mode based on a combination of online and offline analysis, achieving electromagnetic situational awareness and evaluation of the entire process of electronic warfare equipment testing and training.

[0012] Furthermore, the radio frequency subsystem also includes a radio frequency front-end, which is designed as N links consisting of limiters and low-noise amplifiers, according to the frequency band of the radiation source signal, to limit the high-power signal and amplify the power of the weak signal, and input it to the first-level frequency converter; N>1.

[0013] Furthermore, the primary frequency converter is designed with M frequency conversion channels according to the frequency band. Each frequency conversion channel is composed of a filter, an adjustable attenuator, an amplifier, and a mixer connected in sequence. The primary frequency converter completes frequency grouping, filtering, signal amplification, frequency conversion processing, and link switching and gating functions, and outputs a broadband radio frequency signal of a preset frequency.

[0014] Furthermore, the radio frequency channel splitting device includes a splitter and three power-controlled radio frequency channels;

[0015] The splitter divides the broadband radio frequency signal into three paths for simultaneous output.

[0016] The first power-controlled RF channel uses a primary signal amplifier and an adjustable attenuator to regulate the signal power, ensuring that the output signal power is within the allowable input signal power range of the secondary frequency converter. The second power-controlled RF channel uses a primary signal amplifier and an adjustable attenuator to regulate the signal power, ensuring that the output signal power is within the allowable input signal power range of the frequency domain waveform analysis and acquisition equipment. The third power-controlled RF channel uses a three-stage signal amplification and an adjustable attenuator to regulate the signal power, ensuring that the output signal power is within the allowable input signal power range of the time domain waveform analysis and acquisition equipment.

[0017] Furthermore, the secondary frequency converter completes frequency grouping, power amplification, out-of-band filtering, and frequency sweeping processing, down-converting the broadband radio frequency signal to output an intermediate frequency signal with a preset bandwidth.

[0018] Furthermore, the antenna feeder system includes a full-band monitoring antenna, a servo turntable, and an RF feeder, enabling omnidirectional reception of signals from space radiation sources.

[0019] The full-band monitoring antenna is divided into N segments according to the frequency band. The low-frequency band uses a broadband log-periodic antenna, and the high-frequency band uses a broadband high-gain horn antenna.

[0020] The servo turntable adopts a three-dimensional structure and supports three-dimensional rotation of azimuth, pitch and roll. Adjusting the azimuth and pitch angles enables omnidirectional reception of the monitoring antenna, while adjusting the roll angle enables oblique polarization setup of the monitoring antenna to support polarization measurement.

[0021] Furthermore, the full-band calibration subsystem includes a full-band calibration signal source, a power amplifier, and a full-band calibration antenna, which has the ability to generate wideband calibration signals and can check the performance of the monitoring system, such as frequency measurement accuracy, modulation parameter measurement capability, power density measurement accuracy, and signal recognition capability.

[0022] The calibration signal source generates and outputs various types of calibration signals, including continuous waves and pulses.

[0023] The power amplifier amplifies the generated calibration small signal;

[0024] The calibration antenna radiates the amplified calibration signal into space.

[0025] Furthermore, the intermediate frequency signal acquisition subsystem includes a real-time high-speed A / D processing module and a solid-state disk array; the input intermediate frequency signal is processed by the real-time high-speed A / D processing module to complete the acquisition of the raw signal data, and the results are stored in the solid-state disk array in real time.

[0026] Furthermore, the frequency domain waveform acquisition and analysis device performs spectrum monitoring and parameter measurement and analysis on broadband radio frequency signals, and acquires and displays the spectrum information of the signals in real time;

[0027] The time-domain waveform acquisition and analysis device performs time-domain monitoring and parameter measurement and analysis on the detected broadband radio frequency signal, and acquires and displays the signal change pattern over time in real time.

[0028] Furthermore, the signal monitoring and acquisition system also includes signal monitoring and situation display software, which is used to perform online analysis, processing, display, data statistics, and playback of the raw data acquired by the intermediate frequency signal acquisition subsystem AD, the data acquired by the time domain waveform acquisition and analysis equipment and the frequency domain waveform acquisition and analysis equipment, and to display equipment information, radiation source target trajectory, and electromagnetic situation information on a two-dimensional map in real time.

[0029] The signal monitoring and situation display software includes: a real-time signal analysis and identification module, an external guidance control module, an electromagnetic situation module, a statistical analysis module, a data playback module, and a data storage and transfer module.

[0030] The real-time signal analysis and identification module controls the AD acquisition equipment, time-domain waveform acquisition and analysis equipment, and frequency-domain waveform acquisition and analysis equipment of the intermediate frequency signal acquisition subsystem, enabling rapid search and interception of target radiation source signals, high-speed data acquisition, time-domain and frequency-domain parameter measurement, and real-time signal analysis, thereby providing data for target feature identification, statistical analysis, and electromagnetic situation assessment.

[0031] The external guidance and control module receives aerodynamic target air situation guidance information and performs data coordinate transformation, converting the target's north-sky-east coordinate data into the target's GPS coordinate data relative to the geocenter, and then sends it to the servo turntable to adjust the direction of the main beam of the monitoring antenna in order to achieve tracking and monitoring of highly maneuverable targets.

[0032] The electromagnetic situation module records the operating status information of the radiation source signals of each participating equipment based on external guidance information and real-time monitoring and analysis data, including operating frequency band, radiation power, occurrence time, and duration, and displays the information of the participating equipment, target flight trajectory, and electromagnetic situation information on a two-dimensional map in real time.

[0033] The statistical analysis module performs statistical analysis on the energy line graphs of each radiation source signal;

[0034] The data playback module replays the time-domain and frequency-domain waveforms acquired and analyzed in real time.

[0035] The data storage and transfer module completes the storage of raw collected data and real-time monitoring data, as well as the control of big data transfer between the data post-analysis and processing subsystem.

[0036] Furthermore, the data post-processing analysis and processing subsystem includes: a server and a large-capacity disk array, and a data post-processing platform.

[0037] The server and high-capacity disk array receive and store baseband data from the intermediate frequency signal acquisition subsystem via four fiber optic channels in parallel.

[0038] The post-experiment data analysis and processing platform includes: a data management module, a signal sorting module, a signal modulation domain analysis module, a signal parameter statistics module, a signal identification module, and a post-experiment analysis and evaluation report automatic generation module, which are used to perform detailed post-experiment analysis and evaluation processing on the data collected in the experimental task.

[0039] The data management module implements data transfer and data retrieval functions. Data transfer completes the rapid storage of real-time data transmitted in parallel to the disk array; data retrieval completes the acquisition of data from the disk array, selects data from important task stages for analysis according to time nodes, or selects key signal data for analysis according to the size of the data file.

[0040] The signal sorting module uses complex multi-type signal analysis and recognition algorithms to sort the signals in the raw data, and realizes the estimation and identification of parameters of different types of radiation source signals of the test equipment. The parameters include pulse width, carrier frequency, pulse repetition period, and amplitude.

[0041] The signal modulation domain analysis module completes the analysis of the signal modulation parameters;

[0042] The signal parameter statistical analysis module completes the statistical regularity analysis between signal carrier frequency and frequency, repetition frequency and frequency, pulse width and frequency, and amplitude and frequency over a specific time period.

[0043] The signal recognition module identifies the radiation source signals of the tested equipment by combining automatic recognition as the main method with manual recognition as a supplement.

[0044] The post-event analysis and evaluation report generation module automatically generates reports on the post-event analysis and evaluation results of the entire equipment trial and training process, and outputs them in Word format; offline data analysis and evaluation results are displayed on a desktop computer.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] (1) This invention adopts a wide-limit narrow-range and two-stage frequency conversion separation design method, which solves the contradiction between high dynamic reconnaissance and high-speed acquisition, and at the same time solves the design that balances high-sensitivity front-end and split-path reconnaissance. The radiation source signal received by the system is converted once and output as a 2GHz broadband radio frequency signal. After being split, it can be used by time-domain and frequency-domain waveform acquisition and analysis equipment for high-speed acquisition and analysis. At the same time, it can be converted a second time to a 60MHz intermediate frequency bandwidth signal for AD sampling to realize the detection of weak signals.

[0047] (2) This invention adopts aerodynamic target air situation information guidance technology, which can realize the rapid tracking and interception of high-speed aerodynamic targets during the test or training of electronic countermeasures equipment, and visualize the target's flight trajectory and electromagnetic situation in real time on a two-dimensional map, effectively solving the guidance problem of high-speed overhead and flight shortcut targets.

[0048] (3) The present invention designs a data post-processing technology that can quickly transfer the real-time collected raw data and pre-processed data to a large-capacity disk array. It adopts high-speed big data processing capabilities to realize the fine analysis and identification of complex and multi-type signals such as radiation source signals and interference signals in the electronic warfare process. Attached Figure Description

[0049] Figure 1 A schematic diagram of the system composition according to an embodiment of the present invention;

[0050] Figure 2 This is a logical relationship diagram between the various subsystems in an embodiment of the present invention;

[0051] Figure 3 Overall system workflow diagram of this invention embodiment;

[0052] Figure 4 Block diagram of the radio frequency subsystem implementation in this invention;

[0053] Figure 5 Block diagram of the signal monitoring and scoring system of this invention;

[0054] Figure 6 Block diagram of the data post-analysis and processing subsystem in this embodiment of the invention. Detailed Implementation

[0055] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0056] like Figure 1As shown: This invention discloses an electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training. The system includes an antenna feeder system, a radio frequency (RF) subsystem, an intermediate frequency (IF) signal acquisition subsystem, a signal monitoring and recording subsystem, a full-band calibration subsystem, and a post-processing data analysis subsystem. The antenna feeder system includes a full-band monitoring antenna, a servo turntable, and RF feed lines. The RF subsystem includes an RF front-end, a primary frequency converter, an RF channel splitter, and a secondary frequency converter. The IF signal acquisition subsystem includes a real-time high-speed AD combination control unit, a solid-state disk array, and control software. The signal monitoring and recording subsystem includes time-domain waveform acquisition and analysis equipment, frequency-domain waveform acquisition and analysis equipment, and signal monitoring and situational display software. The full-band calibration subsystem includes a full-band calibration signal source, a power amplifier, and a full-band calibration antenna. The post-processing data analysis subsystem includes a server, a large-capacity disk array, a post-processing data platform, and a desktop computer.

[0057] The servo feeder system uses a servo control turntable to adjust the direction of the monitoring antenna, completing the omnidirectional reception of electromagnetic signals radiated from space, and then transmitting them to the radio frequency subsystem.

[0058] In this embodiment, the full-band monitoring antenna is divided into seven segments according to the frequency band. The low-frequency band uses a broadband log-periodic antenna, and the high-frequency band uses a broadband high-gain horn antenna. The servo turntable adopts a three-dimensional structure, supporting azimuth, elevation, and roll rotation. Adjusting the azimuth and elevation angles enables omnidirectional reception of the monitoring antenna; adjusting the roll angle enables oblique polarization setup of the monitoring antenna, supporting polarization measurement.

[0059] Radio Frequency (RF) Subsystem: Receives RF signals transmitted from the monitoring antenna and performs amplitude limiting, low-noise amplification, filtering, and two frequency conversions. The first-converted signal is output to the signal monitoring and acquisition subsystem, and the second-converted signal is output to the intermediate frequency (IF) signal acquisition subsystem.

[0060] Intermediate Frequency Signal Acquisition Subsystem: Receives the intermediate frequency signal after secondary frequency conversion and completes high-speed AD data acquisition and storage.

[0061] Signal monitoring and scoring system: Receives broadband radio frequency signal after one frequency conversion, and splits it into three paths after passing through radio frequency channel splitting equipment. The first path is output to time domain waveform acquisition and analysis equipment, the second path is output to frequency domain waveform acquisition and analysis equipment, and the third path is output to secondary frequency conversion equipment.

[0062] Full-band calibration subsystem: responsible for the calibration of the entire system's functions and performance before system testing.

[0063] The post-experiment data analysis and processing subsystem is responsible for receiving and transferring the raw data collected and stored in real time after the experiment, and performing offline big data analysis and processing.

[0064] like Figure 2The diagram shown illustrates the logical relationships between the various subsystems in this embodiment of the invention. The antenna feeder subsystem receives signals from a space radiation source and transmits them to the radio frequency (RF) subsystem. The RF subsystem performs a first-stage frequency conversion on the radiation source signal, outputting a 2GHz broadband RF signal. This broadband RF signal is then split into three paths by an RF channel splitter. One path is output to a second-stage frequency converter, where it undergoes frequency conversion processing to output a 60MHz intermediate frequency (IF) signal, which is then sent to the IF signal acquisition subsystem to complete the acquisition of the raw signal data and its real-time storage on disk. The raw data acquired is baseband data. The other two paths are output to the time-domain waveform acquisition and analysis equipment and the frequency-domain waveform acquisition and analysis equipment of the signal monitoring and recording subsystem, respectively, to complete the acquisition and real-time analysis of the time-domain and frequency-domain data of the broadband RF signal. The signal monitoring and acquisition subsystem also completes parameter measurement, statistical analysis, and electromagnetic situation display of broadband radio frequency signals; the full-band calibration subsystem completes the functional and performance calibration of the entire electromagnetic situation awareness assessment system; the data post-analysis and processing subsystem receives and stores the raw acquisition data and monitoring data from the intermediate frequency signal acquisition subsystem for offline big data analysis and post-assessment, thereby realizing a signal analysis mode based on a combination of online and offline analysis, and achieving electromagnetic situation awareness assessment of the entire process of electronic countermeasures equipment testing and training.

[0065] like Figure 3 As shown: To illustrate the process and modules more clearly, this invention provides a practical application example:

[0066] (1) Background Requirements

[0067] Based on the actual needs of a certain type of radar anti-jamming test monitoring mission, it is necessary to monitor electromagnetic signals throughout the entire test mission process. In particular, the real-time recording and situational awareness assessment of the working status of ground-based radar equipment radiation source signals, airborne jammer radiation source signals, and ground long-range support jamming signals in the test mission are required to ensure the successful execution of the test mission.

[0068] (2) Electromagnetic environment monitoring before the test task

[0069] Before the test, the electromagnetic environment of the entire test site and its surroundings needs to be monitored. First, the background ambient noise is collected and recorded. Then, through full-band scanning, all electromagnetic signal frequency bands and frequencies appearing in the current test site are monitored. If abnormal signals or illegal frequency signals are detected, the system needs to automatically issue an audible and visual alarm, and technicians should promptly troubleshoot and investigate. Otherwise, the system will continue to monitor the environment and collect data until the test begins.

[0070] (3) Monitoring of radiation source signals during the experimental task

[0071] At the start of the test mission, the system needs to be set to the frequency band where the test mission signal is located, and then execute the stationary search function. For the airborne high-speed target in this test mission, the system needs to receive external guidance information, adjust the monitoring antenna so that its main beam is pointed towards the airborne target for monitoring, and perform real-time monitoring and tracking of the target when the radiation source signal appears. The specific signal monitoring, acquisition, storage, and analysis process is as follows:

[0072] like Figure 4 As shown, the radiation source signal is received by the monitoring antenna of the corresponding frequency band and enters the radio frequency front end. The radio frequency front end is designed with seven links, each consisting of a limiter and a low-noise amplifier, to limit the power of strong signals and amplify the power of weak signals before inputting them to the first-stage frequency converter. The first-stage frequency converter is designed with four frequency conversion channels, including 0.1GHz–1GHz, 1GHz–2GHz, 2GHz–8GHz, and 8GHz–18GHz. Each frequency conversion channel consists of a filter, an adjustable attenuator, an amplifier, and a mixer, and its main functions include filtering out signals outside the frequency band, adjusting signal power, and frequency conversion, ultimately achieving a broadband radio frequency signal output of 2GHz–4GHz from each frequency conversion channel.

[0073] The broadband radio frequency signal is input to the radio frequency channel splitter, which splits it into three outputs. The first output goes through a primary signal amplifier and an adjustable attenuator to achieve power regulation, and is then output to a secondary frequency converter. The second output goes through a primary signal amplifier and an adjustable attenuator to achieve power regulation, and is then output to a frequency domain waveform analysis and acquisition device. The third output goes through a three-stage signal amplification to ensure that the output signal has sufficient output power, and is then output to a time domain waveform analysis and acquisition device.

[0074] The secondary frequency converter performs down-conversion processing on the broadband radio frequency signal, outputting an intermediate frequency signal with a bandwidth of 125MHz±30MHz for AD data acquisition and storage, enabling high-sensitivity signal monitoring. The frequency domain waveform analysis and acquisition equipment and the time domain waveform analysis and acquisition equipment directly and rapidly acquire and analyze the broadband radio frequency signal, outputting signal spectrum diagrams and time domain waveform diagrams locally, or displaying them remotely at the main control terminal.

[0075] like Figure 5As shown, the signal monitoring and situation display software is the core component of the system's control and display. First, it receives aerodynamic target air situation guidance information and performs data coordinate transformation, converting the target's north-sky-east coordinates into GPS coordinates relative to the geocenter. This data is then sent to the servo turntable to adjust the direction of the main beam of the monitoring antenna, enabling tracking and monitoring of highly maneuverable targets. Second, it controls the AD acquisition equipment, time-domain waveform acquisition and analysis equipment, and frequency-domain waveform acquisition and analysis equipment to achieve rapid search and interception of target radiation source signals, high-speed data acquisition, time-domain and frequency-domain parameter measurement, and real-time signal analysis, providing data for target feature identification, statistical analysis, and electromagnetic situation assessment. Finally, based on all the above monitoring operations, it records the operating status information of each participating equipment's radiation source signals, including operating frequency band, radiation power, occurrence time, and duration, and displays equipment deployment information, target flight trajectory, and electromagnetic situation on a two-dimensional map in real time.

[0076] (4) Offline data analysis after the experiment

[0077] After the experiment, all the real-time acquired and stored data was first transferred to a large-capacity disk array via four optical fibers. Then, the data was read from the disk array for offline analysis using a post-analysis platform. Data reading could be performed by selecting data from important task phases according to time nodes, or by selecting key signal data based on file size. Finally, complex multi-type signal analysis and recognition algorithms were used to perform signal sorting, modulation domain analysis, and signal parameter statistical analysis of the raw data. Combined with manual assistance, this enabled the identification of signals from various radiation sources.

[0078] like Figure 6 The data post-processing analysis and processing subsystem of this embodiment includes: a server and a large-capacity disk array, and a data post-processing platform.

[0079] The server and high-capacity disk array receive and store baseband data from the intermediate frequency signal acquisition subsystem via four fiber optic channels in parallel.

[0080] The data post-analysis and processing platform includes: a data management module, a signal sorting module, a signal modulation domain analysis module, a signal parameter statistics module, a signal identification module, and a post-analysis and evaluation report automatic generation module. It is used to perform detailed post-analysis and evaluation processing of the data collected in the experimental task.

[0081] The data management module implements data transfer and data retrieval functions. Data transfer completes the rapid storage of real-time data transmitted in parallel to the disk array; data retrieval completes the acquisition of data from the disk array.

[0082] The signal sorting module uses complex multi-type signal analysis and recognition algorithms to sort the raw data, and estimates and identifies parameters such as pulse width, carrier frequency, pulse repetition period, and amplitude of different types of radiation source signals from the test equipment.

[0083] The signal modulation domain analysis module completes the analysis of the signal modulation parameters.

[0084] The signal parameter statistical analysis module performs statistical analysis on the relationship between signal carrier frequency and frequency, repetition frequency and frequency, pulse width and frequency, and amplitude and frequency over a specific time period.

[0085] The signal recognition module enables the identification of radiation source signals from the tested equipment.

[0086] The post-event analysis and evaluation report generation module automatically generates reports on the post-event analysis and evaluation results of the entire equipment trial and training process, and outputs them in Word format.

[0087] This invention proposes an electromagnetic situational awareness and assessment system for electronic warfare equipment trials. It meets the requirements for electromagnetic signal measurement and situational assessment during equipment combat tests at the test range. The system can perform full-process, high-precision electromagnetic awareness and assessment of complex combat tests, and can provide reference data for adjudication by both sides when test results are unsatisfactory. Currently, this system has been applied to actual test missions in a certain military unit, capable of real-time recording of the radiation source signals of the participating combat equipment and displaying the electromagnetic situational assessment, providing a scientific and quantitative assessment method for equipment trials.

[0088] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. An electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training, comprising an antenna feeder system and a full-band calibration system, characterized in that... Also includes: The system comprises a radio frequency (RF) subsystem, an intermediate frequency (IF) signal acquisition subsystem, a signal monitoring and recording subsystem, and a data post-processing analysis subsystem. The RF subsystem includes primary frequency converter equipment, RF channel splitting equipment, and secondary frequency converter equipment. The signal monitoring and recording subsystem includes time-domain waveform acquisition and analysis equipment, frequency-domain waveform acquisition and analysis equipment, and signal monitoring and situation display software. The space-based feeder system is used to receive signals from space radiation sources and transmit them to the radio frequency subsystem. The radio frequency subsystem performs a first-stage frequency conversion on the radiation source signal and outputs a broadband radio frequency signal. The broadband radio frequency signal is split into three paths by the radio frequency channel splitter. One path is output to the second-stage frequency conversion device, which performs down-conversion processing and outputs an intermediate frequency signal to the intermediate frequency signal acquisition subsystem. The other two paths are output to the time domain waveform acquisition and analysis device and the frequency domain waveform acquisition and analysis device of the signal monitoring and recording subsystem, respectively. The intermediate frequency signal acquisition subsystem completes the acquisition of raw data and real-time disk storage; wherein, the raw data is baseband data obtained from the intermediate frequency signal; The signal monitoring and scoring system completes the acquisition and real-time analysis of time-domain and frequency-domain data of broadband radio frequency signals, and realizes parameter measurement, statistical analysis and electromagnetic situation display of broadband radio frequency signals; The full-band calibration subsystem completes the functional and performance calibration of the electromagnetic situational awareness and assessment system itself. The data post-event analysis and processing subsystem receives and stores the raw acquisition data and monitoring data from the intermediate frequency signal acquisition subsystem for offline analysis and post-event evaluation of big data, thereby realizing a signal analysis mode based on a combination of online and offline analysis, and achieving electromagnetic situational awareness and evaluation of the entire process of electronic countermeasures equipment testing and training. The radio frequency channel splitting device includes a splitter and three power-controlled radio frequency channels; The splitter divides the broadband radio frequency signal into three paths for simultaneous output. The first power-controlled RF channel uses a primary signal amplifier and an adjustable attenuator to regulate the signal power, ensuring that the output signal power is within the allowable input signal power range of the secondary frequency converter. The second power-controlled RF channel uses a primary signal amplifier and an adjustable attenuator to regulate the signal power, ensuring that the output signal power is within the allowable input signal power range of the frequency domain waveform analysis and acquisition equipment. The third power-controlled RF channel uses a three-stage signal amplification and an adjustable attenuator to regulate the signal power, ensuring that the output signal power is within the allowable input signal power range of the time domain waveform analysis and acquisition equipment. The antenna feeder system includes a full-band monitoring antenna, a servo turntable, and radio frequency feeders, enabling omnidirectional reception of signals from space radiation sources. The full-band monitoring antenna is divided into seven segments according to the frequency band. The low-frequency band uses a broadband log-periodic antenna, and the high-frequency band uses a broadband high-gain horn antenna. The servo turntable adopts a three-dimensional structure and supports three-dimensional rotation of azimuth, pitch and roll. Adjusting the azimuth and pitch angles enables the omnidirectional reception of the monitoring antenna, while adjusting the roll angle enables the oblique polarization setup of the monitoring antenna to support polarization measurement. The signal monitoring and situation display software is used to perform online analysis, processing, display, data statistics, and playback of the raw data acquired by the intermediate frequency signal acquisition subsystem AD, as well as the data acquired by the time domain waveform acquisition and analysis equipment and the frequency domain waveform acquisition and analysis equipment. It also displays equipment information, radiation source target trajectory, and electromagnetic situation information on a two-dimensional map in real time. The signal monitoring and situation display software includes: a real-time signal analysis and identification module, an external guidance control module, an electromagnetic situation module, a statistical analysis module, a data playback module, and a data storage and transfer module; The real-time signal analysis and identification module controls the AD acquisition equipment, time-domain waveform acquisition and analysis equipment, and frequency-domain waveform acquisition and analysis equipment of the intermediate frequency signal acquisition subsystem, enabling rapid search and interception of target radiation source signals, high-speed data acquisition, time-domain and frequency-domain parameter measurement, and real-time signal analysis, thereby providing data for target feature identification, statistical analysis, and electromagnetic situation assessment. The external guidance and control module receives aerodynamic target air situation guidance information and performs data coordinate transformation, converting the target's north-sky-east coordinate data into the target's GPS coordinate data relative to the geocenter, and then sends it to the servo turntable to adjust the direction of the main beam of the monitoring antenna in order to achieve tracking and monitoring of highly maneuverable targets. The electromagnetic situation module records the operating status information of the radiation source signals of each participating equipment based on external guidance information and real-time monitoring and analysis data, including operating frequency band, radiation power, occurrence time, and duration, and displays the information of the participating equipment, target flight trajectory, and electromagnetic situation information on a two-dimensional map in real time. The statistical analysis module performs statistical analysis on the energy line graphs of each radiation source signal; The data playback module replays the time-domain and frequency-domain waveforms acquired and analyzed in real time. The data storage and transfer module completes the storage of raw collected data and real-time monitoring data, as well as the control of big data transfer between the data post-analysis and processing subsystem.

2. The electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training according to claim 1, characterized in that: The radio frequency subsystem also includes a radio frequency front-end, which is designed as N links consisting of limiters and low-noise amplifiers according to the frequency band of the radiation source signal. The radio frequency front-end performs limiting of strong power signals and power amplification of weak signals, and inputs them to the first-level frequency converter; N>1.

3. The electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training according to claim 1, characterized in that: The primary frequency converter is designed with M frequency conversion channels according to the frequency band. Each frequency conversion channel is composed of a filter, an adjustable attenuator, an amplifier, and a mixer connected in sequence. The primary frequency converter completes frequency grouping, filtering, signal amplification, frequency conversion processing, and link switching and gating functions, and outputs a broadband radio frequency signal at a preset frequency.

4. The electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training according to claim 1, characterized in that: The secondary frequency converter completes frequency grouping, power amplification, out-of-band filtering, and frequency sweeping processing, and performs down-conversion processing on the broadband radio frequency signal to output an intermediate frequency signal with a preset bandwidth.

5. The electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training according to claim 1, characterized in that: The intermediate frequency signal acquisition subsystem includes a real-time high-speed A / D processing module and a solid-state disk array; the input intermediate frequency signal is processed by the real-time high-speed A / D processing module to complete the acquisition of the raw signal data, and the results are stored in the solid-state disk array in real time.

6. The electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training according to claim 1, characterized in that: The frequency domain waveform acquisition and analysis device performs spectrum monitoring and parameter measurement and analysis on broadband radio frequency signals, and acquires and displays the spectrum information of the signals in real time; The time-domain waveform acquisition and analysis device performs time-domain monitoring and parameter measurement and analysis on the detected broadband radio frequency signal, and acquires and displays the signal change pattern over time in real time.

7. The electromagnetic situational awareness and assessment system for electronic warfare equipment testing and training according to claim 1, characterized in that, The data post-processing analysis and processing subsystem includes: a server and a large-capacity disk array, and a data post-processing platform. The server and high-capacity disk array receive and store baseband data from the intermediate frequency signal acquisition subsystem via four fiber optic channels in parallel. The post-experiment data analysis and processing platform includes: a data management module, a signal sorting module, a signal modulation domain analysis module, a signal parameter statistics module, a signal identification module, and a post-experiment analysis and evaluation report automatic generation module, which are used to perform detailed post-experiment analysis and evaluation processing on the data collected in the experimental task. The data management module implements data transfer and data retrieval functions. Data transfer completes the rapid storage of real-time data transmitted in parallel to the disk array; data retrieval completes the acquisition of data from the disk array, selects data from important task stages for analysis according to time nodes, or selects key signal data for analysis according to the size of the data file. The signal sorting module uses complex multi-type signal analysis and recognition algorithms to sort the signals in the raw data, and realizes the estimation and identification of parameters of different types of radiation source signals of the test equipment. The parameters include pulse width, carrier frequency, pulse repetition period, and amplitude. The signal modulation domain analysis module completes the analysis of the signal modulation parameters; The signal parameter statistical analysis module completes the statistical regularity analysis between signal carrier frequency and frequency, repetition frequency and frequency, pulse width and frequency, and amplitude and frequency over a specific time period. The signal recognition module is used to identify the radiation source signals of the tested equipment; The post-event analysis and evaluation report generation module automatically generates reports on the post-event analysis and evaluation results of the entire equipment trial and training process, and outputs them in Word format.

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