| Due to the increasingly complex battlefield target environment,the radar seeker with a single waveform or a single mode can not meet the requirements of precision guidance.The radar seeker with a composite of semi-active mode and active mode has the characteristics of long detection range and high detection precision,which has gradually become the development trend of precise guidance technique.Based on the project of semi-active/active composite radar seeker,this paper first introduces the overall structure of semi-active/active composite radar seeker system and the task assignment of sub-system.For HPRF-PD mode,a specific signal processing scheme is introduced according to the working principle.The waveform design method of gate lobe suppression is presented for the signal of Multi-Stage Stepped-Frequency LFM.Then the design of semi-active / active mode switching for radar seeker is described.Secondly,the design and implementation of semi-active / active radar seeker signal processor based on multi-core DSP is presented.The function and frame design of signal processor is introduced,including the software framework architecture,hardware platform,task partitioning of Multi-core and so on.Aiming at the HPRF-PD mode,the design and implementation of the main function modules of the signal processor are described in detail.The SRIO interface is used to realize the high speed data receiving task of echo and direct wave.The real-time signal processing is realized by means of EDMA and multi-core communication.And the task of communicating with subsystem is realized by means of EMIF,SRIO and SGMII.Finally,the radar echo and direct wave signal simulator developed in the laboratory is used to build a test system to verify the function of radar seeker signal processor.For HPRF-PD mode,the test results verify the real-time performance of high-speed data reception,and verify the correctness of the processing function of direct and echo signals. |
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