Research On MIMO Radar Waveform Design And Array Distribution

MIMO radar is a hot issue in the radar field, because the MIMO radar has manycharacteristics superior to conventional phased array radar. This paper focuses on thestudy of MIMO radar array distribution and waveform design, analyzes the mainadvantages of MIMO radar, MIMO radar array lineup for the virtual MIMO radaraperture, beamforming and DOA estimation, and shows the MIMO radar orthogonalsignal and partial correlation signal design methods and analysis of results.Firstly, propose the MIMO radar array signal model, and elaborates throughtheoretical analysis and simulation, MIMO radar resolution capability in a multi-targetscenario, anti-acquisition performance, and the improvement in reducing the receiverdynamic range requirements. Then describe the array distribution, the principle ofvirtual aperture extension, minimum redundancy MIMO array design methods and theapplication of MIMO radar DOA estimation simulation. Finally, proposes the MIMOradar orthogonal signal design and partial correlation signal design methods and resultsof the transmit beampattern synthesis.MIMO radar virtual aperture provides greater degrees of freedom and larger arrayaperture, and can distinguish more targets with higher angle resolution. As the transmitof orthogonal signals, and the time accumulation, MIMO radar haslow probability ofinterception, and reduces the requirements of the receiver dynamic range.MIMO arrays using a larger array spacing and uncolocated anntenas produce morevirtual elements, and the NLA array’s performance is also better than the ULA array.The application of minimum redundancy array for MIMO radar minimizes spatialredundancy, and it can form more adaptive beamforming zero, and can more effectivelysuppress the interference within the mainlobe.For OFDM LFM signal, with the rise of the frequency difference between thesignals, the signal cross-correlation characteristics improves significantly, cross-correlation peak is reduced with the rise of the frequency difference, of course, the bandwidth of the system will also increase. Give the genetic algorithm-based design oforthogonal polyphase coded signal and analysis of the influence of code length, phasenumber, the number of signals on the performance of coded signal. The signals’saverage ASP and CP will be decreased as the code length increases. Phase number andthe number of signals’ influence on average ASP and CP is relatively small, four-phasecode has better performance and its encoding complexity is also smaller. Finally,propose the method of transmit beampattern synthesis based on the design of time-domain polyphase coded signal employing genetic algorithm, and two instances toprove the effectiveness of this approach.