Design And Implementation Of Radar Signal Processing System Of Missile-borne Distributed Coherent Synthetic Radar

With the rapid development of modern science and technology,radar seeker is facing more and more complex and changeable battlefield electromagnetic environment,so the challenge for seeker to fight alone will become greater and greater.For example,single seeker has poor anti-interference ability and weak detection power.Therefore,in order to adapt to the future modern information battlefield,the missiles are developing towards the trend of synergy,systematization and integration,that is,the realization of multiple missiles to attack the target in a coordinated way.This thesis is based on this background,several seeker constitute a distributed phase coherent synthesis system,and the distributed phase coherent synthesis technology is applied to the seeker.The echo SNR can be increased byN?N~3 times(indicating the number of seeker)without increasing the missile load scale.Meanwhile,the multi-missile cooperative operation can improve the seeker's own security and anti-jamming and anti-destruction capability.This thesis focuses on the design and implementation of distributed radar signal processing system.The specific work content is summarized as follows:1.Taking two seeker as the distributed phase coherent synthesis system,the test parameters of the missile-borne distributed phase coherent synthesis radar are designed,and the signal processing results and calculation statistics of the missile-borne radar working in the received phase coherent mode(MISO,MIMO)and full phase coherent mode are simulated and analyzed.In order to verify the SNR gain results of the missile-borne radar under the receiving phase coherent mode,an infield line feed test scheme for the projectiles distributed phase coherent radar and an infield air feed test scheme for the microwave anechoic chamber were designed.Its workflow can be divided into four stages:echo generation stage,parameter configuration stage,echo loading stage and receiving phase coherent work stage.2.According to the designed test scheme,the tasks of the distributed phased composite radar signal processing system are divided.In the online feed mode,the signal processing system is composed of a coherent signal processor and a host computer,in which the signal processor is composed of four board CARDS:AD signal acquisition board,DA signal generation board,FPGA+DSP signal processing board and data transfer board.3.The logic implementation of signal preprocessing algorithm in AD signal acquisition preprocessing module is introduced in detail.It mainly includes:clock domain division of AD signal acquisition and preprocessing module,multi-channel digital signal separation algorithm,data cache module and pulse compression algorithm principle and simulation debugging results.4.For the task division of the missile-borne distributed radar signal processing system,the FPGA+DSP signal processing board is used as the control center to complete the protocol analysis and forwarding of the upper computer and the time sequence control of the receiving phase coherent working mode.Therefore,this thesis introduces in detail the design and implementation of FPGA+DSP signal processing board protocol parsing and forwarding module,and the design and implementation of timing sequence control logic in the phase of parameter configuration,data loading and receiving phase coherent signal processor.