Test And Analysis Of Spaceborne Ultra-wideband Radar Reconnaissance System

This thesis introduces the overall composition of the spaceborne ultra-wideband radar reconnaissance system,simulates and tests the basic theories and key technologies used in the design and implementation of the spaceborne ultra-wideband radar reconnaissance system,and samples high-speed data,data rate conversion,signal detection,Signal parameter estimation simulation and test results were analyzed.The spaceborne ultra-wideband radar reconnaissance system consists of two parts: the front-end equipment system,the data acquisition and analysis system.The front-end equipment system consists of RF front-end,analog-to-digital conversion,digital channelization,and signal detection modules.The data acquisition and analysis system consists of data reception and signal parameter estimation modules.The main work of the thesis is as follows:1.The algorithm and process of spaceborne radar signal processing are studied.The spaceborne ultra-wideband radar reconnaissance system samples the input signal with band-pass sampling,then performs spectrum correction,adopts the digital channelization data rate conversion method based on serial structure polyphase filter,and finally uses the time domain energy detection algorithm to detect the signal.In view of the low signal-to-noise ratio of the received signal in the spaceborne ultra-wideband radar reconnaissance system,the autocorrelation detection algorithm is studied to improve the detection performance.2.The parameter estimation algorithm and flow of the spaceborne radar signal are studied.Firstly,phase difference algorithm is used to identify the signal modulation type according to different signal frequency domain differences.Then,according to different signal modulation types,phase difference algorithm,Fourier coefficient interpolation iterative single frequency measurement algorithm,flat method,fast solution linear frequency modulation algorithm and instantaneous.The frequency histogram method is used to estimate the intrapulse parameters of the spaceborne radar signal.Finally,the dynamic clustering algorithm and the sequence difference histogram algorithm are used to estimate the inter-pulse parameters.3.This paper introduces the working mode of the spaceborne ultra-wideband radar reconnaissance system,tests the whole system,introduces the test platform,test methods and steps,compares the system test results with the simulation results,the test results of each module and analyzes the reasons.