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Therefore, this article mainly research on the performance of transmit diversity MIMO radar and beamforming technology. The principal tasks are as follows:

1. Research and analyze the basic principles and characteristics of MIMO radar, as well as its advantages compared to the traditional  phased array radar.

2. Study the orthogonal design method of polyphase coded signals. Analyze the feasibility of applying intelligent algorithms to the signal design and use the ant colony algorithm in the design of orthogonal polyphase coded signals. The method of multi-phase codes is analyzed; on this basis, the ant colony algorithm and integration of genetic algorithms are combinited to generate a new intelligent algorithm which is then introduced into the design of orthogonal polyphase coded signals. This algorithm is proved to be superior by comparied with relevant  approach resultsl in iteratures.

3. Analyze the effect of parameters on the signal autocorrelation and cross-correlation, such as the code length, the signal number and phase number in the design of orthogonal polyphase coded signals.
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