Zero correlation zone like polyphase code design based on genetic algorithm

Target echoes always span several range bins when high range resolution multiple input multiple output (MIMO) radar systems are employed. Hence it is expected that the transmitted signal has lower auto-and cross-correlative sidelobes near mainlobes. A novel approach to design zero correlation zone (ZCZ) like polyphase codes based on genetic algorithm is proposed. The proposed method selects the ZCZ sequence set as initial population and optimizes the crossover and mutation operations according to the characteristics of the ZCZ sequence set. With correlated signals energy being pushed far from the mainlobe, the designed polyphase code has lower auto-and cross-correlative sidelobes near the mainlobe. Finally, the validity of the algorithm is proved by simulation.