Research Of Reconnoissance And Identification For MIMO Radar Signals

Radar detects object using electromagnetic wave. Radar reconnaissance systemintercepts signals from enemy radar and analyzes and processes it, then providesinformation for radar interfering equipment.Wireless communication system has the phenomenon of multipath fading. It weakensstability of channel. If adopting MIMO techniques, wireless communication system sendand receive simultaneously using many antennas, then can overcome multipath fading andimprove communication quality. As a promotion of MIMO techniques in the field of radar,MIMO radar has excellent performance. Diversity enables the MIMO radar much moresuperior than standard radar in several aspects, including: LPI, parameter estimation,transmit beampattern design, clutter suppression and target imaging. On the other hand,MIMO radar brings new challenge to EW in the future. In order to adapt development ofEW (Electronic Warfare), we need start to study the new radar reconnaissance equipment.This article introduces the types of MIMO radar, analyzes the principles and signalprocessing of MIMO radar, and simulates the beampattern of MIMO radar. The orthogonalsignal models that MIMO radar adopts are introduced. OFDM LFM signal is emphasizedand simulated in many cases. And performance of MIMO radar is analyzed.The equipment for reconnoitering MIMO radar is studied. This article introducessystems and characteristics of traditional reconnaissance equipment for radar, including:super heterodyne receivers, instantaneous frequency measurement receivers, channelizedreceivers and digital receivers. Based on analysis on adaptability of traditional receivers,the article brings forward the hybrid receivers and analyzes its basic units and characteristic.Then strategy of reconnoitering MIMO radar is presented in the paper.For verifying the existence of MIMO radar, this paper studies how to identify the signalsof MIMO radar, traditional methods of signal sorting and its adaptability for MIMO radarsignals. Because MIMO radar can transmit multiple probing signals synchronously, thereceivers receives the signal that is mixed. So the method of decomposing singular valuesand blind signal processing which can identify the signals of MIMO radar is adopted. Theinterface of simulation is designed and the arithmetic is verified effective by MATLAB.The existence of MIMO radar can be estimated by pertinence among signals.