Development Of An Integrated Signal Processor For Missile-borne Wide-swath Imaging

SAR imaging radar has the ability to obtain high resolution two-dimensional images in all day,all-weather and multi scene conditions,and has an unparalleled advantage in the field of target detection and identification.In recent years,as the nation's ocean-going warfare demand has increased,using real-time wide-swapping SAR technology to detect,identify and locate the remote imaging of target groups at sea has gradually become the focus of seeker technology,which has very important research value and significance.In this paper,the wide-swapping radar seeker imaging processor is studied.The main tasks completed are as follows:A radar signal integrated processor system based on the OPEN VPX architecture was designed,which includes a multi-channel intermediate frequency acquisition and signal pre-processing acquisition board,a multi-core DSP parallel imaging processing array,an integrated programming-based radar master control interface board.At the same time,a high-speed serial data transmission network and a control/feedback information exchange network were constructed for the processor system.In the program design of multichannel intermediate frequency acquisition and preprocessing,the dynamic adjustment mechanism based on AGC/cutting function actuator is introduced in view of the difficulty of the pre-processing of the fixed point radar signal with the uncertainty of the dynamic range of the scene echo.By analyzing the radar echo intensity in real time,the cut-off factor of each unit in radar preprocessing is chosen flexibly,and the goal of keeping the maximum calculation precision under the condition of fixed operation bit width is realized,and the result of later imaging processing is improved effectively.A master control software design framework consisting of “one master,many slaves,and coordination” was constructed,and a flight control protocol analysis module with a clearly structured function was designed,which enabled the radar master control board to have multi-channel burst parallel processing capabilities,effectively guarantee the control and implementation of various workflows for wide swath imaging radars.The radar imaging parameter calculation module designed by using HLS method was added.It can calculate the time of sampling gate and synthetic aperture in real time according to the current position and velocity information of the platform and adjust the accumulated number of PRI in the imaging CPI in time.Under the condition that the azimuth resolution of the radar imaging is ensured,the scanning search time of the radar system can be effectively shortened.