Research And Implementation Of Radar Signal Acquisition And Processing Method For Bistatic Movement Platform

Bistatic moving platform radar can not only monitor target in all weather conditions,but also have many advantages such as better concealment,small volume,strong anti-strike ability and high viability and so on,which has important academic research value.However,compared with single platform radar,Bistatic moving platform has various geometric structure,which results in difficulty of data acquisition and signal processing.Thus,it is important to explore new data acquisition methods and signal processing methods.Airborne bistatic synthetic aperture radar is a typical bistatic moving platform radar system,this thesis takes it as the research object,developing the Lab VIEW based programmable echo acquisition and storage system,as well as the imaging software1.Aiming at the geometric construction of airborne bistatic SAR,this thesis analyzed the echo wave model,resolution trait,and Doppler trait of airborne bistatic SAR,which lays the foundation for the airborne bistatic SAR data acquisition and imaging processing.2.Aiming at the technical problem of airborne bistatic SAR system synchronization,this thesis analyzed local vector signal generator and satellite time transfer based time frequency synchronization scheme,as well as the error source,and developed the echo acquisition trigger control program with self-error correction.3.Aiming at the problem of high speed and large capacity data acquisition,this thesis analyzed the contradiction between the data generation rate and the memory card transfer rate,realized the multithreading data storage scheme,and analyzed the sequential relationship of navigation information and echo wave,finally realized navigation information and echo wave data combined storage scheme.4.Aiming at the double root trait of airborne bistatic SAR,this thesis analyzed the range double root equivalent model of Range-Doppler(RD)imaging algorithm,and realized imaging software by Lab VIEW on NI PXI embedded processor.In the methods mentioned above,the acquisition and storage system has been verified in the field experiment and the imaging processing software has been verified by simulation experiments.