Research And Implementation Of Radar Signal Sorting Based On Seeker

The passive seeker is an important part of the anti-radiation missile(ARM).It needs to search and track the radar signal accurately in real time,and can guide the ARM to successfully strike the target under decoy conditions.The passive seeker receives the pulse sequence of multiple radars interlaced together,and sorts out the overlapping radar signals through radar signal sorting technology.When the seeker successfully locks the target,it performs decoy recognition to accurately strike the target.In this thesis,radar signal sorting and anti-decoy technology which is the key technology on the ARM seeker are researched.The main works include the following parts:Aiming at the shortcomings of the CFSFDP algorithm that requires manual selection of cluster centers and no denoising processing,an improvement measure is proposed to automatically obtain cluster centers based on local density and nearest neighbor distance and to eliminate noise based on local density.Through algorithm simulation comparison,the sorting performance and anti-interference ability of the improved algorithm are verified.Through simulation and comparison of classic PRI sorting algorithms,an improved SDIF algorithm suitable for fixed,jitter,and staggered PRI is proposed.This algorithm can solve the problems of fractured pulse sequence and harmonic pulse sequence in PRI sorting,and is verified by simulation.Considering the problem that the missile cannot strike the target under the synchronous flashing decoy,the recognition of single target in the pulse leading-edge and the time-lag decoy recognition method based on clustering are proposed.Finally,the flight trajectory of the ARM before and after the algorithm is simulated to verify the feasibility of the decoy identification method.Finally,a passive seeker signal processor based on TMS320C6678 DSP is designed.The seeker adopts FPGA+DSP hardware architecture,which can realize complex timing design and signal processing algorithms.This thesis introduces the software design architecture of the signal processor based on the passive seeker.Meanwhile,the radar signal sorting algorithm and the decoy recognition algorithm mentioned above are implemented on the DSP.Finally,the performance of the DSP processing algorithm is verified through the debugging results of the whole system.