基于GASA算法的DFCW-LFM波形设计

离散频率编码波形是一类常用的多输入多输出雷达波形,加入线性调频能够改善其自相关性能。将基于遗传算法和模拟退火的混合算法用于离散频率编码线性调频(discrete frequency coding waveform linear frequency modulation, DFCW-LFM)波形的优化设计,仿真结果表明,用该优化算法得到的信号其相关性能要优于现有方法。另外,提出了一种改进的DFCW-LFM波形设计方法。该方法在DFCW-LFM波形的基础上,对频率编码子脉冲同时进行相位编码,构成DFCW-LFM和相位编码的混合波形,并采用混合算法对其进行优化设计。仿真结果表明,和已有的DFCW-LFM波形相比,所设计混合波形的相关性能得到了进一步改善。

DFCW-LFM waveform design based on GASA algorithm

Discrete frequency coding waveform(DFCW)is a kind of waveform in common use for multiple input multiple output(MIMO)radars. Replacing the fixed frequency individual pulses with linear frequency modulation （LFM） pulses can improve the auto correlation performance of DFCW. The genetic simulated annealing algorithm (GASA) based on the genetic algorithm(GA)and simulated annealing(SA)is used to design the discrete frequency coding waveform linear frequency modulation(DFCW-LFM)waveform. The comparison results indicate that the performance of the designed waveform is enhanced. In addition,a modified DFCW LFM design method is proposed. Phase coding waveform is applied to the subpulses of DFCW-LFM,thus forming a compound waveform,and the GASA algorithm is also employed in its optimization. Compared with the existing DFCW-LFM,simulation results show that the performance of the proposed compound waveform in correlation is improved.