Design And Implementation Of Signal Processing System For Millimeter Wave Seeker

The W-band is an important window frequency in millimeter waves.The research of radar signal processing systems in this band is a hot topic in millimeter-wave applications.FPGA-based millimeter-wave radar signal processing systems can achieve miniaturization,low power consumption,and high-speed data processing.The requirements of this paper mainly focus on the design of radar signal processing system.This article proposes an analog pulse compression scheme based on expansion processing based on the subject’s functional requirements and realizes the processing of echo de-skewing,mid-band pass sampling,quadrature transform polyphase filtering,multiple decimation and FFT operations.In the clutter suppression of echo signals,an improved pulse canceller structure is proposed for the problem of the narrower notch of the secondary canceller and a MATLAB simulation comparison analysis is performed to verify the improved pulse canceller.The canceller has a deeper notch and a flatter passband response.A moving target detection scheme with a pipeline structure is designed to realize the real-time processing of moving target detection data.The shutter limit detection scheme with an average of neighboring units is used to achieve a constant false alarm probability detection.In order to achieve high-speed data transmission between FPGA and DSP,EMIF high-speed transmission interface is designed to make the data transmission rate reach 40MB/s.The processed data is tracked in the DSP through point aggregation,4 cycles of defuzzification,distance and speed tracking algorithms,and sum pulse angle tracking algorithms.Finally,the ISE 14.7 platform is used to complete the system construction and hardware implementation.The system physical diagram,circuit design diagram,real-time signal diagram captured by the chipscope tool,and signal spectrum diagram on the spectrum analyzer are given.It is verified that the system can complete the function of radar signal processing in different modes,and realize the search and tracking of targets.