| Statistical MIMO radar which use chaotic signal waveform can improve the detection performance by waveform and space of diversity. Statistical MIMO radar also can improve the resolution ,and have the advantages of low probability of intercept. This paper mainly discusses the problems of MIMO radar waveform design, target characteristics and clutter characteristics, echo signal simulation and adaptive filter .The main contents of study are summarized as follows.1. According to the requirement of orthogonality ,chaotic signal is selected as the MIMO radar waveform in this paper. The results of calculations and simulations on the ambiguity function, autocorrelation and cross-correlation of the chaotic signals can prove that chaotic signal is appropriate to the MIMO radar waveform;2.Since target scintillation can deteriorate the detection performance in traditional radar, MIMO radar can effectively suppress this phenomenon by the design of spatial distribution of the antennas. MIMO radar system has clutter interference which reduces the detection performance. So the problem of the target characteristics and clutter characteristics are discussed, and the RCS of several typical objects and multi-path channel are simulated.3. Echo signal of MIMO radar is composed of the target signal, clutter and the additive noise. By the analysis of echo signals, it is found that MIMO radar can reduce the effect of target scintillation.4. If the clutter power is too large , false alarm will occur. So an adaptive filter is introduced to slove this problem .The result of simulation can prove that the clutter can be filtered by the LMS filter, and the detection performance of radar targets can be enhanced. |
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