Design Of MIMO Radar Orthogonal Polyphase Code Based On Genetic Tabu Algorithm

The proposition of MIMO radar makes a major innovation in the development of radartechnology; its appearance is of great significance and becomes the attention of researchers inthe radar field. Compared to conventional phased array radar, MIMO radar has a series ofunique advantages, such as high degree of freedom, strong anti-jamming capability, large timebandwidth, difficult to be intercepted, strong stealth capability; these features make the studyof MIMO radar more far-reaching significance.Currently, two systems of MIMO radar are extensively studied on. one is MIMO radarwith collocated antennas from Lincoln Laboratory, USA,the other is MIMO radar withwidely separated antennas from Bell Labs. In order to avoid mutual interference between thesignals, orthogonal signals are transmitted on the transmission side, while on the receivingside, echo signals are received through the matched filter. On the hand, to distinguish two ormore targets from the same direction, radar needs to have good autocorrelation properties; on theother hand, to reduce the interference of different target echos, radar needs to have goodcross-correlation properties.Aiming at the autocorrelation properties and cross-correlation properties of MIMO radarorthogonal waveform design with colocated antennas, innovations is proposed:(1) Hybrid algorithm based on genetic algorithms and tabu search algorithm is proposedin the paper. Aiming at MIMO radar orthogonal polyphase code design. Tabu search algorithmis introduced into the genetic algorithm as its mutation operator.The advantages of geneticalgorithm and tabu search algorithm are considered in the algorithm, genetic algorithm hasglobal search ability, and the main advantage of tabu search algorithm is the strong localsearch ability. In addition, the thought of elitist is adopted in the algorithm, so as to preservethe solution which is close to the optimal solution and continually approach the final optimalsolution, local outstanding individual values are saved directly to of the next generation.Results indicate the polyphase code sequences designed have good correlations; they havelower autocorrelation peak sidelobes and cross-correlation peaks.(2) MIMO radar zero class zone like orthogonal polyphase code design is studied the thepaper, Aimed at the zero class like orthogonal polyphase code design, hybrid optimizationalgorithm is applied to MIMO radar zero class like orthogonal polyphase code design. Thepaper does not select the zero correlation zone sequence set as initial population, butrandomly select a certain number of sequences as the initial population, a certain area near the zero correlation zone is chosen as the cost function, the mixed optimization algorithm isadopted, then get a set of polyphase code sequences, Results show that the proposedalgorithm has better optimizing performance, so are more suitable for practical applications.Finally a summary of the main contents of the full paper is given, pointed out that thehybrid algorithm design has good results on MIMO radar waveform design and theinadequacies of this paper, as well as the topic we need to study next.