Sea clutter feature broadening simulation method, system and medium based on multi-point model

Abstract

The present invention discloses a method, system and medium for simulating the broadening of sea clutter characteristics of a multi-point model, measures the frequency-converted radar signal, and obtains the measurement result; performs automatic gain control on the radar signal according to the pulse amplitude and the preset pulse amplitude working threshold condition to obtain the received signal; performs down-conversion to an intermediate frequency signal on the received signal after amplitude balancing through automatic gain control; generates a baseband signal of a clutter multi-point signal based on the intermediate frequency signal and completes the modulation of the amplitude of the clutter multi-point signal and the broadening modulation signal to obtain a clutter interference signal; delays, amplitude modulates and Doppler modulates the clutter interference signal to obtain a simulated radar signal, and radiates the simulated radar signal after up-conversion to the tested radar. The present invention simulates a clutter signal and has a simulated clutter amplitude modulation output function, which meets the simulation requirements of sea clutter confrontation training test and sea clutter signal simulation level quantitative test.

Description

Technical Field

[0001] The invention relates to a method, system and medium for simulating characteristic broadening of sea clutter based on a multi-point model, and belongs to the technical field of simulating characteristic broadening of sea clutter. Background Art

[0002] Since the multi-point amplitude signal modulation sea clutter feature fine simulation technology belongs to the high-tech industry in the sea clutter amplitude simulation technology, it has not yet entered the developed stage and is a high-tech product. Especially in the military field, the mature application of multi-point amplitude modulation clutter signal simulation technology has not yet been seen. With the needs of actual combat exercises and training in naval warfare confrontation, it is urgent to study the sea clutter feature fine simulation technology. The sea clutter feature broadening simulation method of the multi-point model needs to simulate the clutter signal modulation method for the sea warning radar. Under the complex sea conditions faced by the sea warning radar, the authenticity and real-time performance of the sea clutter feature broadening simulation method of the multi-point model have become the difficulties of the clutter feature generation method. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method, system and medium for simulating the characteristic broadening of sea clutter of a multi-point model.

[0004] To achieve the above object, the present invention provides a method for simulating sea clutter feature broadening based on a multi-point model, comprising:

[0005] Step 1, frequency-converting the acquired radar signal, measuring the frequency-converted radar signal, and obtaining measurement results including frequency, pulse period, pulse width, and pulse amplitude;

[0006] Step 2, performing automatic gain control on the radar signal according to the pulse amplitude and the preset pulse amplitude working threshold condition to obtain a received signal;

[0007] Step 3, down-converting the received signal after amplitude balancing through automatic gain control to an intermediate frequency signal;

[0008] Step 4, generating a baseband signal of a clutter multi-point signal based on the intermediate frequency signal, modulating the baseband signal by amplitude and width modulation of the clutter multi-point signal, and obtaining a clutter interference signal;

[0009] Step 5, delay, amplitude modulate and Doppler modulate the clutter interference signal simulated intermediate frequency radar signal to obtain a simulated radar signal, and up-convert the simulated radar signal and radiate it to the tested radar.

[0010] The sea clutter characteristic broadening simulation system based on the multi-point model is used to execute the above-mentioned method, comprising: an AGC control component unit, used to perform frequency conversion on the acquired radar signal, measure the radar signal after frequency conversion, obtain measurement results including frequency, pulse period, pulse width and pulse amplitude, and perform automatic gain control on the radar signal according to the pulse amplitude and a preset pulse amplitude working threshold condition to obtain a received signal;

[0011] A radio frequency receiving unit, used for down-converting a received signal after amplitude balancing through automatic gain control to an intermediate frequency signal;

[0012] The multi-point amplitude signal modulation unit is used to generate a baseband signal of a clutter multi-point signal based on an intermediate frequency signal, modulate the baseband signal of the clutter multi-point signal amplitude and the width modulation signal, and obtain a clutter interference signal;

[0013] The radio frequency transmitting unit is used to delay, amplitude modulate and Doppler modulate the clutter interference signal to obtain a simulated radar signal, and then up-convert the simulated radar signal and radiate it to the tested radar.

[0014] Preferably, the frequency synthesizer unit is used to provide the radio frequency local oscillator signal required by the radio frequency transmitting unit, the radio frequency receiving unit and the multi-point amplitude signal modulation unit.

[0015] Preferably, the AGC control component unit includes a second radio frequency receiving unit, an intermediate frequency measurement unit and a closed-loop power control unit, wherein:

[0016] A second radio frequency receiving unit, used for frequency conversion of the acquired radar signal;

[0017] An intermediate frequency measurement unit is used to measure the frequency-converted radar signal to obtain a measurement result;

[0018] The closed-loop power control unit is used to automatically control the gain of the radar signal according to the pulse amplitude and the preset pulse amplitude working threshold condition to obtain the received signal.

[0019] Preferably, the radio frequency transmitting unit comprises a radio frequency transmitting component unit and an up-conversion component unit, wherein:

[0020] An up-conversion component unit is used to delay, amplitude modulate and Doppler modulate the clutter interference signal to obtain a simulated radar signal;

[0021] The radio frequency transmitting component unit is used to radiate the simulated radar signal to the radar under test.

[0022] Preferably, the radio frequency transmitting component unit adopts a radio frequency transmitting component, and the up-conversion component unit adopts an up-conversion component;

[0023] The radio frequency transmitting component adopts a DRFM component as a long delay component and adopts multiple groups of tapped delay lines to realize delay, amplitude modulation and Doppler modulation of multiple targets.

[0024] Preferably, the multi-point amplitude signal modulation unit includes an AD component, a DA component and an FPGA signal processing unit.

[0025] Preferably, the radio frequency receiving unit includes a signal frequency conversion component, a signal amplification component and a signal gain control component.

[0026] A computer-readable storage medium stores a computer program, which implements the steps of the above-mentioned method when executed by a processor.

[0027] The beneficial effects achieved by the present invention are:

[0028] Aiming at the simulation demand of clutter authenticity amplitude generation, the present invention provides a simulation platform of software radio technology based on multi-scattering point high-speed DA and multi-point scattering feature superposition processing to simulate clutter amplitude characteristics, measures the radar signal after frequency conversion and obtains the measurement result; performs automatic gain control on the radar signal according to the pulse amplitude and the preset pulse amplitude working threshold condition to obtain the received signal; performs down-conversion on the received signal after amplitude balance through automatic gain control to an intermediate frequency signal; generates a baseband signal of a clutter multi-point signal based on the intermediate frequency signal and completes the modulation of the clutter multi-point signal amplitude and the broadening modulation signal to obtain a clutter interference signal; delays, amplitude modulates and Doppler modulates the clutter interference signal to obtain a simulated radar signal, and performs up-conversion on the simulated radar signal and radiates it to the tested radar. The required clutter signal characteristic data is obtained by calibrating the Doppler broadening ratio coefficient, and the required clutter signal is output to complete the simulation of the clutter signal. It has the function of simulated clutter amplitude modulation output, which can meet the simulation needs of sea clutter confrontation training test and sea clutter signal simulation level quantitative test, especially under certain conditions, it can optimize the test of the radar system's ability to counter sea clutter when searching and tracking targets. It is suitable for market fields such as troop simulation tests and conventional sea search radars, and is suitable for military fields such as radar sea assessment, anti-clutter confrontation exercises, and radar factory inspection. It can meet the anti-interference training of clutter confrontation exercises, the actual combat training of the tested radar system, and the test needs of conventional radars before leaving the factory. It has both national defense strategic significance and high practical engineering application value, and has extremely broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a principle block diagram of the present invention;

[0030] Figure 2 It is a schematic diagram of the multi-point model modulation generation principle of the present invention. DETAILED DESCRIPTION

[0031] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention.

[0032] If the descriptions of "first", "second", etc. are involved in the present invention, they are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present invention provides a sea clutter feature broadening simulation method based on a multi-point model, comprising an AGC control component, a radio frequency receiving unit, a radio frequency transmitting unit, a frequency synthesizer unit, a multi-point amplitude signal modulation unit and a control computer unit;

[0034] The AGC control component includes a radio frequency receiving unit, an intermediate frequency measurement unit and a closed-loop power control unit. The radio frequency receiving component can use a domestic high-performance receiving component (independently developed), an intermediate frequency measurement unit and a closed-loop power control unit to automatically complete control through software (independently developed).

[0035] The RF transmitting unit includes a RF transmitting component and a power amplifier component, wherein a mixer, an attenuator and an amplifier are used in the RF transmitting component. The mixer adopts the mixer MRRKI-0320, the attenuator adopts the attenuator HMC939A, the dynamic range is 60dB, and the double-stage series connection can reach more than 110dB. The amplifier adopts the amplifier A397, and the power amplifier component uses the solid-state power amplifier TGA2509 of TRIQUIT. The signal power output by the power amplifier group is 1W, and the RF transmission function is completed by the above devices.

[0036] The frequency synthesis signal unit includes a high-precision and high-stability crystal oscillator unit and a signal frequency conversion unit. The high-precision and high-stability crystal oscillator unit adopts Mitech's high-stability and low-noise constant temperature crystal oscillator, and its phase noise reaches -155dBc / Hz@1kHz. The mixer, attenuator and amplifier can use the same devices as the RF transmitting unit. By selecting the above devices, the stable output of various local oscillator signals is achieved.

[0037] The multi-point amplitude signal modulation unit includes an AD component, a DA component and an FPGA signal processing unit, etc. The multi-point amplitude signal modulation unit specifically adopts AD's 8-bit 3Gsps AD converter ADC083000, Xilinx Virtex5 series FPGA XC5VSX95T-2FF1136, Cypress's QDR-II memory model CY7C1514KV18-250BZC, GSPS 12-bit DAC, EUVIS's 12-bit 4Gsps DA converter MD652D and the high-speed dual-port static memory QDR-Ⅱ+ 6U cPCI interface, which meets the flexible programmable function of software radio.

[0038] The control computer system includes a high-performance single-board control computer, a high-performance real-time operating system and software. Specifically, a high-performance single-board computer, ADLink's cPCI6880 board, a dual-core processor, onboard 4G Flash memory, low power consumption, and a real-time operating system using Wind River's VxWorks system to meet the requirements of high real-time performance, scalability and multi-task scheduling capabilities.

[0039] The frequency conversion component unit adopts the existing microwave up-conversion component, and the AD component, DA component and FPGA signal processing unit component are all implemented using the current existing hardware platform. The frequency synthesis signal unit, RF transmission component, power amplifier component, signal frequency conversion component, signal amplification component and signal gain control component can all be implemented using the existing hardware component platform, and this embodiment does not list the models in detail.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sea clutter feature broadening simulation method based on a multi-point model, characterized in that: include: Step 1, frequency converting the acquired radar signal, measuring the frequency converted radar signal, and obtaining measurement results including frequency, pulse period, pulse width and pulse amplitude; Step 2, performing automatic gain control on the radar signal according to the pulse amplitude and the preset pulse amplitude working threshold condition to obtain a received signal; Step 3, down-converting the received signal after amplitude balancing through automatic gain control to an intermediate frequency signal; Step 4, generating a baseband signal of a clutter multi-point signal based on the intermediate frequency signal, modulating the baseband signal by amplitude and width modulation of the clutter multi-point signal, and obtaining a clutter interference signal; Step 5: Delay, amplitude modulate and Doppler modulate the clutter interference signal to obtain a simulated radar signal, and up-convert the simulated radar signal and radiate it to the tested radar.

2. The sea clutter feature broadening simulation system based on the multi-point model is characterized by: The method for executing claim 1 comprises: The AGC control component unit is used to perform frequency conversion on the acquired radar signal, measure the radar signal after frequency conversion, obtain measurement results including frequency, pulse period, pulse width and pulse amplitude, and perform automatic gain control on the radar signal according to the pulse amplitude and a preset pulse amplitude working threshold condition to obtain a received signal; The AGC control component unit includes a second radio frequency receiving unit, an intermediate frequency measurement unit and a closed-loop power control unit, wherein: A second radio frequency receiving unit, used for frequency conversion of the acquired radar signal; An intermediate frequency measurement unit is used to measure the frequency-converted radar signal to obtain a measurement result; A closed-loop power control unit is used to automatically control the gain of the radar signal according to the pulse amplitude and the preset pulse amplitude working threshold condition to obtain the received signal; A radio frequency receiving unit, used for down-converting a received signal after amplitude balancing through automatic gain control to an intermediate frequency signal; The multi-point amplitude signal modulation unit is used to generate a baseband signal of a clutter multi-point signal based on an intermediate frequency signal, modulate the baseband signal of the clutter multi-point signal amplitude and the width modulation signal, and obtain a clutter interference signal; The multi-point amplitude signal modulation unit includes an AD component, a DA component and an FPGA signal processing unit; the multi-point amplitude signal modulation unit specifically adopts AD's 8-bit 3Gsps AD converter ADC083000, Xilinx Virtex5 series FPGAXC5VSX95T-2FF1136, Cypress's QDR-II memory model CY7C1514KV18-250BZC, GSPS12-bit DAC, EUVIS's 12-bit 4Gsps DA converter MD652D and high-speed dual-port static memory QDR-Ⅱ+ 6U cPCI interface, which meets the flexible programmable function of software radio; The radio frequency transmitting unit is used to delay, amplitude modulate and Doppler modulate the clutter interference signal to obtain a simulated radar signal, and then up-convert the simulated radar signal and radiate it to the tested radar.

3. The sea clutter feature broadening simulation system based on a multi-point model according to claim 2, characterized in that: include: The frequency synthesizer unit is used to provide the radio frequency local oscillator signal required by the radio frequency transmitting unit, the radio frequency receiving unit and the multi-point amplitude signal modulation unit.

4. The sea clutter feature broadening simulation system based on a multi-point model according to claim 2, characterized in that: The radio frequency transmitting unit includes a radio frequency transmitting component unit and an up-conversion component unit, wherein: An up-conversion component unit is used to delay, amplitude modulate and Doppler modulate the clutter interference signal to obtain a simulated radar signal; The radio frequency transmitting component unit is used to radiate the simulated radar signal to the radar under test.

5. The sea clutter feature broadening simulation system based on a multi-point model according to claim 4, characterized in that: The radio frequency transmitting component unit adopts a radio frequency transmitting component, and the up-conversion component unit adopts an up-conversion component; The radio frequency transmitting component adopts a DRFM component as a long delay component and adopts multiple groups of tapped delay lines to realize delay, amplitude modulation and Doppler modulation of multiple targets.

6. The sea clutter feature broadening simulation system based on a multi-point model according to claim 2, characterized in that: The radio frequency receiving unit includes a signal frequency conversion component, a signal amplification component and a signal gain control component.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 1 are implemented.

Images