CN113835070A - Radar tactical performance detection and anti-interference capability evaluation simulator - Google Patents
Radar tactical performance detection and anti-interference capability evaluation simulator Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
Abstract
The invention mainly provides a radar tactical performance detection and anti-interference capability evaluation simulator system with a working frequency of 0.5-18GHz, which is used for solving the defects that the existing radar simulator has a single signal system and cannot control a complex signal modulation mode. The simulator adopts the technical scheme of storing frequency and modulating (target simulation and interference simulation) forwarding of radar transmitting signals, can set radiation signal parameters of a tested radar through software, can generate fixed carrier frequency, frequency modulation pulse, phase modulation pulse and high-repetition frequency PD radar radiation signals, can simulate noise suppression type interference, deception type interference and combined interference of two interference modes, and finishes radar azimuth, elevation and distance detection precision calibration. The simulator mainly comprises a receiving/transmitting antenna, a receiving unit, a target/interference/signal baseband generating unit (DDM unit), a frequency synthesizer unit, an up-conversion and radio frequency channel unit, a display control unit, a power supply and the like.
Description
Technical Field
The invention belongs to the technical field of radar target simulators, and particularly relates to a radar simulator system with tactical performance detection and anti-interference capability evaluation as main functions.
Background
The radar tactical performance detection and the anti-interference capability evaluation run through the whole life cycle of radar performance detection, the interference signal generated by the simulator is used for radar performance detection and radar anti-interference capability test, and electronic tactical training is carried out on electronic war operation and commanders. The general radar simulator can simulate the types including a two-coordinate searching radar, a three-coordinate searching radar, a tracking radar and the like, and the working system of the radar comprises coherent and incoherent, pulse compression, pulse Doppler, conical scanning, monopulse, phased array, side scanning and side tracking, continuous wave and the like. The radar target and interference simulator can generate programmable target echo signals, interference signals and background clutter signals, and can simulate the effective reflection area, flicker and fluctuation of the target. At present, the radar target echo simulator and the interference simulator which take a digital radio frequency memory as a core technology greatly enhance the simulation capability of coherent target echoes and deception interference signals. However, the simulation of the echo signal of the general radar mainly adopts the technology of controlling hardware to generate a signal by software, and the generated signal has a single system and cannot control a complex signal modulation mode.
Disclosure of Invention
The invention provides a radar tactical performance detection and anti-interference capability evaluation simulator with the working frequency of 0.5-18GHz, aiming at the defects that the existing radar simulator has a single signal system and cannot control a complex signal modulation mode. The simulator can set the radiation signal parameters of the tested radar through software, can generate fixed carrier frequency, frequency modulation pulse, phase modulation pulse and high-repetition frequency PD radar radiation signals, can simulate noise suppression type interference, deception type interference and combined interference of two interference modes, and can finish radar azimuth, elevation and distance detection precision calibration under the cooperation of a truth value system.
The technical scheme of the radar tactical performance detection and anti-interference capability evaluation simulator comprises the following steps: the radar tactical performance detection and anti-interference capability evaluation simulator adopts the technical scheme of frequency storage, modulation (target simulation and interference simulation) and forwarding of radar transmitting signals, and can adapt to the working types of radars with frequency agility, diversity, intra-pulse carrier frequency fixation/carrier frequency modulation, pulse width agility, repetition frequency agility and the like. The simulator mainly comprises a receiving/transmitting antenna, a receiving unit, a target/interference/signal baseband generating unit (DDM unit), a frequency synthesizer unit, an up-conversion and radio frequency channel unit, a display control unit, a power supply and the like.
The receiving unit mainly receives the transmitted signal of the tested radar through an antenna, amplitude limiting amplification and stable receiving of the radar signal are achieved, the received radar radio frequency signal is converted into a radar intermediate frequency baseband signal required by the target/interference/signal baseband generating unit through a frequency conversion network, and the radar intermediate frequency baseband signal is used as a radar baseband sample signal required by target echo simulation and deception interference simulation.
The target/deception/signal echo generating unit mainly generates signals required by a target, deception, echo and the like, and specifically comprises the following steps: 1. measuring radar frequency, pulse width and repetition frequency period and detecting threshold; 2. radar target echo intermediate frequency baseband signals; 3. calibrating a target intermediate frequency baseband signal by a radar; 4. deception jamming intermediate frequency baseband signals; 5. noise suppression interferes with the intermediate frequency baseband signal; 6. and the intermediate frequency baseband signal of the radiation source.
The frequency synthesizer unit mainly provides local oscillation signals required by up-down conversion for the receiving unit and the up-conversion and radio frequency channel unit, and provides required clock reference signals for each unit, so that the clock of the whole machine is unified.
The up-conversion and radio frequency channel unit is used for inverse processing of the receiving unit, up-converting the simulated target echo, deception interference, noise suppression interference and radiation source baseband signals output by the target/interference/signal baseband generating unit to radar radio frequency, carrying out amplitude modulation and power amplification, and outputting to a transmitting antenna.
The display control unit is a control center of the radar tactical performance detection and anti-interference capability evaluation system, mainly manages and configures system resources, sets and displays fighting situation parameters, and controls the simulator to generate radar target echo signals, various deception interference signals, various noise interference signals and passive radar detection target radiation source signals.
Drawings
Fig. 1 is a schematic diagram of a simulator composition.
Fig. 2 is a schematic diagram of the radio frequency receiving circuit.
Fig. 3 is a schematic diagram of the high and medium frequency receiving circuit.
Fig. 4 is a schematic diagram of an intermediate frequency receiver circuit.
Fig. 5 is a schematic diagram of the target/interferer/signal generation unit components.
Fig. 6 is a schematic diagram of the up-conversion and rf channel unit components.
Detailed Description
The technical solutions of the present invention are further described below with reference to specific embodiments, but the present invention is not limited thereto, and any modifications or equivalent substitutions made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention should be covered by the protection scope of the present invention.
Fig. 1 is a schematic diagram illustrating the principle of the radar tactical performance detection and interference rejection evaluation simulator according to the present invention. As shown in the figure, the radar tactical performance detection and anti-interference capability evaluation simulator comprises a receiving/transmitting antenna, a display control unit, a receiving unit, a target/interference/signal baseband generating unit, a frequency synthesizer unit, an up-conversion and radio frequency channel unit, an interference signal transmitting antenna and the like.
Further: the gain of the receiving/transmitting antenna is 0dB, the beam width is more than or equal to +/-15 degrees, and the antenna polarization mode adopts horizontal/vertical linear polarization.
Further: the receiving unit mainly comprises a radio frequency receiving circuit, a high and medium frequency receiving circuit, a medium frequency receiving unit and the like.
As shown in fig. 2, the rf receiving circuit requires different simulated receiving sensitivity and anti-burnout capability, and the design of the rf receiving unit adopts a design scheme of a programmable attenuator, an amplitude limiter, a low noise amplifier, and a down-conversion network, taking into consideration factors such as receiving sensitivity, receiving dynamic range, and burnout resistance. The high-power-resistant program-controlled attenuator and the high-input-power amplitude limiter are designed in front of the low-noise amplifier to ensure that the functions of inputting dynamic 70dB and anti-burning power larger than 36dBm are realized, and the low-noise amplifier is adopted at the radio-frequency front end of the equipment to ensure the realization of the sensitivity index of the equipment.
As shown in fig. 3, the high-if receiving circuit is mainly used for processing a 4GHz rf signal output by the rf receiving circuit, and a controllable gain amplifier is used to adjust the amplification gain and cooperate with amplitude limiting amplification to ensure that the maximum power level of the if signal provided by the down-conversion circuit for digital frequency storage remains relatively constant, thereby improving the quality of DRFM output signals and preventing device damage caused by too large input amplitude of the ADC.
As shown in fig. 4, the intermediate frequency receiving circuit performs frequency selection, amplification and frequency conversion on the output signal of the high and intermediate frequency receiving circuit, and outputs an intermediate frequency signal required by the DDM unit. A wide and narrow filter selection circuit is designed in the intermediate frequency receiving circuit, and when parameters are determined and known in a calibration state, a narrow-band filter type can be selected, so that the frequency selectivity is improved, and the influence of an external environment is reduced. The intermediate frequency receiving and frequency converting circuit adopts a high local oscillator, and the frequency spectrum separation of the intermediate frequency output after frequency conversion and the input and local oscillator signals is larger, thereby being beneficial to controlling the stray level of signals and reducing the design difficulty of circuits at all levels.
Further: the target/deception/signal echo generating unit mainly comprises a target echo generating channel, a deception jamming generating channel, a suppression jamming and radiation source generating channel and 3 channels and a radar pulse measuring circuit.
As shown in fig. 5, the target/interference/signal generation unit mainly comprises a clock management module, a DSP, a large-scale high-performance FPGA, a high-speed ADC, a storage module QDDR, a high-speed DAC, and the like. The clock management module receives an external clock signal, distributes the external clock signal to the high-speed ADC, the high-speed DAC1 and the high-speed DAC2, and provides coherent clock signals with the same frequency and phase for the modules. The high-speed ADC receives an intermediate frequency signal sent by a receiving channel, the intermediate frequency signal is quantized into four paths of high-speed differential digital signals through the high-speed ADC and sent to the FPGA, the high-speed differential digital signals are converted into LVDS standard level through a level conversion module inside the high-performance FPGA, then the high-speed data are converted into low-speed data through a serial-parallel conversion module, and a transmitted pulse sample is stored in a storage area of the digital frequency storage module in a sliding window mode under the control of a write pulse signal generated by a threshold signal to finish the storage of the signals.
Further: the frequency synthesizer mainly comprises a crystal oscillator, a harmonic generator, a filter, a power divider, an amplifier, a point frequency source, a PLL (phase locked loop), a PDRO (pulse-modulated reverse osmosis) circuit, a control circuit and the like. The frequency synthesizer mainly has the functions of providing local oscillation signals required by an up-down frequency conversion network for the receiving unit and the transmitting unit, providing local oscillation signals required by the high-intermediate frequency circuit and the intermediate frequency circuit, providing clock signals for the DDM unit, and consists of a frequency marking module and a broadband local oscillation module.
Further: the up-conversion and radio frequency channel unit mainly comprises a target echo up-conversion and radio frequency channel circuit and an interference/radiation source up-conversion and radio frequency channel circuit, wherein each channel circuit comprises an up-conversion network, an amplification filter circuit, a program-controlled attenuator and the like. As shown in fig. 6, the up-conversion and rf channel unit and the receiving unit use the same local oscillation frequency point, and the local oscillation signal is distributed to the receiving unit and the up-conversion and rf channel unit through power division and amplification. The intermediate frequency baseband signal output by the target/interference/signal generation unit is firstly subjected to frequency conversion in a high-intermediate frequency conversion network to generate a 4GHz high-intermediate frequency analog signal, then is subjected to up-conversion reduction to the working frequency of the tested radar through a radio frequency conversion network, and is output by an antenna after amplitude control and power amplification.
Further: the display control unit mainly comprises an integrated display control computer, a keyboard and mouse accessory and other modules. The main functions are accomplished: 1. system resource management and configuration: managing and distributing the resource allocation of software and hardware of the simulator; self-checking the simulator; performing operation control of the simulator according to a command of the display control software; 2. setting and displaying the war parameters: setting a simulator working mode, tested radar parameters, target echo simulation parameters, deception jamming patterns and parameters, noise suppression jamming patterns and parameters, radiation source parameters and the like through display control software, and displaying related parameters; 3. radar target echo simulation control: according to the set radar parameters, target amplitude and target motion parameters, and parameters such as the real-time position of the target, the target speed and the like, controlling a simulator to generate radar target echo signals, wherein the characteristics of time delay, Doppler frequency shift, target amplitude and the like are solved and controlled, and the target echo signal simulation is completed; 4. radar calibration target simulation control: according to the set radar parameters, the calibration target parameters and the calibration target motion parameters, controlling a simulator to generate radar calibration target echo signals, including resolving and controlling time delay, Doppler frequency shift, amplitude control and the like, and completing the simulation of the calibration target echo signals; 5. radar deception jamming simulation control: controlling and simulating to generate various deception jamming signals including speed false target jamming, dense false target jamming, flicker noise jamming and the like and resolving jamming power according to the set deception jamming pattern and jamming parameters to complete real-time control of deception jamming simulation; 6. noise suppression interference simulation control: according to the set suppression interference pattern and the set interference parameters, the system is controlled to simulate and generate various noise interference signals, including broadband blocking noise interference, narrowband aiming frequency noise interference, sweep frequency noise interference and the like, parameters such as bandwidth, carrier frequency, sweep frequency period and the like can be manually set, interference power is resolved, and real-time control of suppression interference simulation is completed; 7. analog control of the radiation source: and simulating to generate passive radar detection target radiation source signals according to parameters such as carrier frequency, repetition frequency, pulse width, intra-pulse modulation and the like of the bound radiation source, and finishing real-time control of passive radar detection target radiation source signal simulation.
Claims (6)
1. A radar tactical performance detection and anti-interference capability evaluation simulator is characterized by comprising a receiving/transmitting antenna, a receiving unit, a target/interference/signal baseband generation unit (DDM unit), a frequency synthesizer unit, an up-conversion and radio frequency channel unit, a display control unit, a power supply and the like.
2. The radar tactical performance detection and interference rejection capability evaluation simulator of claim 1, wherein the receiving unit mainly comprises a radio frequency receiving circuit, a high and medium frequency receiving circuit, a medium frequency receiving unit and the like, and mainly uses an antenna to receive a transmitting signal of a tested radar, so as to realize amplitude limiting amplification and stable receiving of the radar signal, and frequency-converts the received radar radio frequency signal into a radar medium frequency baseband signal required by a target/interference/signal baseband generating unit through a frequency conversion network, so as to serve as a radar baseband sample signal required by target echo simulation and deception interference simulation.
3. The radar tactical performance detection and interference rejection capability assessment simulator of claim 1, wherein said target/spoof/signal echo generating unit mainly comprises a target echo generating channel, a spoof interference generating channel, a squelch interference and radiation source generating channel 3 channels and a radar pulse measuring circuit, said target/spoof/signal echo generating unit mainly generates the required signals of target, spoof, echo, etc., specifically comprising: 1. measuring radar frequency, pulse width and repetition frequency period and detecting threshold; 2. radar target echo intermediate frequency baseband signals; 3. calibrating a target intermediate frequency baseband signal by a radar; 4. deception jamming intermediate frequency baseband signals; 5. noise suppression interferes with the intermediate frequency baseband signal; 6. and the intermediate frequency baseband signal of the radiation source.
4. The radar tactical performance detection and interference rejection capability assessment simulator of claim 1, wherein said frequency synthesizer is mainly composed of a crystal oscillator, a harmonic generator, a filter, a power divider, an amplifier, a point frequency source, a PLL, a PDRO, a control circuit, etc., said frequency synthesizer mainly provides local oscillator signals required for up and down conversion for a receiving unit, an up conversion and a radio frequency channel unit, and provides required clock reference signals for each unit, so that the whole clock is uniform.
5. The radar tactical performance detection and interference rejection capability assessment simulator of claim 1, wherein said up-conversion and rf channel unit mainly comprises two parts of a target echo up-conversion and rf channel circuit and an interference/radiation source up-conversion and rf channel circuit, each channel circuit is composed of an up-conversion network, an amplification filter circuit, a programmable attenuator, etc., said up-conversion and rf channel unit is the inverse process of the receiving unit, up-converts the simulated target echo, deception jamming, noise suppression jamming and radiation source baseband signals outputted by the target/interference/signal baseband generating unit to radar rf, and performs amplitude modulation and power amplification, and outputs to the transmitting antenna.
6. The radar tactical performance detection and anti-interference capability assessment simulator of claim 1, wherein said display control unit is mainly composed of modules such as an integrated display control computer and keyboard and mouse accessories, said display control unit is a control center of the radar tactical performance detection and anti-interference capability assessment system, and is mainly used for managing and configuring system resources, setting and displaying tactical parameters, and controlling the simulator to generate radar target echo signals, various deception jamming signals, various noise jamming signals and passive radar detection target radiation source signals.
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Cited By (4)
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| CN114844577A (en) * | 2022-05-05 | 2022-08-02 | 西安亨孚防务科技有限责任公司 | Broadband multi-style signal simulator |
| CN115219999A (en) * | 2022-06-29 | 2022-10-21 | 扬州宇安电子科技有限公司 | Broadband low-stray cannonball simulation system |
| CN115453474A (en) * | 2022-09-21 | 2022-12-09 | 南京新频点电子科技有限公司 | Subsonic fixed wing unmanned aerial vehicle platform radar comprehensive simulation device |
| CN115754946A (en) * | 2022-11-22 | 2023-03-07 | 扬州宇安电子科技有限公司 | Composite echo signal simulator |
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