| MIMO Radar is a new type of radar system, and it is the further development of conventional Phased Array Radar. In the traditional radar, transmitting signals can form the high-gain beams in the required space. In MIMO radar, the wave front is divided into several sub arrays along the longitudinal direction and each array will launch mutually orthogonal waveform that can form low-gain wide beams in space. This new type of radar can bring many improvements of the radar’s performance. For example, it can improve abilities of the radar’s interception, and can enhance the speed’s resolution of targets, and also can increase detection abilities of targets at a low speed.This article mainly discusses the design of MIMO radar’s phase code and the signal’s processing. Firstly, the basic principle and the related characteristics of MIMO radar are studied and the radar’s performance indexes are also analyzed. Secondly, the paper analyses the influence of phase coded MIMO radar’s signal processing that is brought by doppler frequency. The paper takes example by the M sequence, and a doppler compensation algorithm is proposed. Thirdly, the theory of MIMO radar signal processing is studied and the process of MIMO radar signal processing is also discussed deeply. It mainly includes matched filtering technique, beamforming technique, radar target detection technique and constant false-alarm rate technique. At the same time, different processing sequence of matched filtering systems and beamforming systems may bring some influences to the computational complexity and the paper compares differences between them. Finally, the article introduces the construction of the radar’s simulation experimental platform, and discusses realizations of each module’s process. At last the platform gives some simulation results to prove the validity of the theory. |
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