Signal Processing Method And Hardware Implementation Of High-accuracy RCS Measurement For Moving Target

The Radar Cross Section(RCS)measures the ability of a target to scatter electromagnetic waves in a specific direction after receiving a radar wave.It is a basic parameter of the radar target characteristic information.Therefore,radar cross section measurement of the radar target plays an important role in the radio measurement field.The traditional target RCS is mainly measured by the microwave darkroom.This method is only applicable to small-size targets.Constrained by far-field conditions,RCS for large-sized vehicle targets is difficult to measure by darkroom methods.In recent years,many scholars have used near-field approximation to measure RCS of large-scale targets,but their accuracy is difficult to verify.If you place a large-scale target RCS into an outdoor measurement,you must eliminate the effects of ground clutter.To solve these problems,this paper proposes a signal processing and implementation method of high-precision RCS measurement under target motion conditions and premise of satisfying far-field electromagnetic radiation conditions.The main contents and innovations of this article are as follows:(1)Aiming at the measurement of large-scale target RCS such as vehicles,it is proposed to conduct it under the background of outdoor ground clutter.High-precision RCS measurement method.Based on the pulse doppler processing method,this method reduces the energy gain and loss of signal processing by using the time-domain matching function in the distance domain and the Chirp-Z processing in the doppler domain.Taking the advantage of the moving target outside the clutter area of the major lobe,the purpose of high-precision measurement of the RCS is achieved.(2)Based on the theory of high-precision RCS measurement algorithm based on moving target detection,a method based on Field-programmable gate array(FPGA)real-time signal processing architecture,in the realization of time domain processing,uses data buffering and parallel processing to realize real-time processing of the time-shifted matching function of echo signals;in the doppler domain,in the traditional doppler filter bank implementation architecture,using IP core multiplexing technology to implement spectrum subdivision with low resource implementation.The signal processing architecture has the advantages of simple structure,high resource reuse rate,fast processing speed,good real-time performance of the system,and low power consumption of the system.(3)Implementation and system test of High Precision RCS Measurement System Based on Moving Target Detection.From the requirement of high-precision measurement of vehicle target RCS,through the overall design of the system and the design of each algorithm module,the hardware implementation of the high-precision RCS measurement system is implemented.At the same time,an FPGA verification platform was set up to test and verify the moving target RCS measurement system.Based on the proposed algorithm and circuit structure,Verilog programming is carried out to optimize the designed hardware circuit,and the performance of the designed dynamic target RCS measurement system is verified by the hardware simulation test.The verification results show that the signal processing capability of the moving target RCS measurement system meets the expected indicators.The research results of this paper can be applied to large-scale moving target RCS measurement fields such as vehicles,and can also provide theoretical support for target recognition,radar stealth and so on.Therefore,it has important theoretical significance and application value.