Signal Processing And Simulation For MIMO-OTH Radar System

The technology and features of the Multiple Input Multiple Output(MIMO) radar have been applied in the Over-the-horizon(OTH) radar, which builds a new radar system. This new system has received much attention from many researchers in the field of radar at home and abroad. Compared with the traditional OTH radar’s huge transmitter and receiver array antennas, this thesis holds that MIMO-OTH radar works in a particular radar station layout, and arranges small-aperture arrays. This thesis discusses the problem of the joint signal processing for MIMO-OTH radar with multiple stations. The major work and contributions are as follows:(1) Analysis of Signal CoherenceTo analyze the coherence of the received signals from the point of signal’s transmission, this thesis mainly considers the influential factors that radar signals of different transmission path have on the reflection coefficient and attenuation of the target. It emphasizes on the phase difference between multi-station signals caused by the path distance. Through simulation analysis, it can be found that MIMO-OTH radar with multiple stations is not suitable for coherent processing, but for a more robust non-coherent processing.(2) Performance of the joint estimation of target location and velocity usingnon-coherent MIMO-OTH radar with multiple stationsAssuming orthogonal waveforms, temporally white, zero-mean noise-plus- clutter that is complex Gaussian random process, and independent reflection coefficient. Under these assumptions, Firstly, the received signal model is given, and the maximumlikelihood(ML) estimate is analyzed. Then the joint CRB is calculated. We do some simulation experiments with Matlab, and present an analysis of the joint estimation of target location and velocity by using a MIMO-OTH radar with widely separated antennas.(3) Target detection using non-coherent MIMO-OTH radar with multiple stationsIn consideration of the specific radar station layout, this thesis points out two ways to get the target detector implemented: centralized processing and distributed processing. And then analysis and comparison of the two target detection approaches are given..According to the theory of optimal detection, By combining the performance of station layout with conventional radar processing method, an optimized signal processing architecture is given, which greatly improves the operation efficiency. Lastly, this thesis continues to discuss the coupling in the location and velocity using MIMO-OTH radar with multiple stations.