为了解决正交频分线性调频信号(OFD-LFM)空域合成信号的自相关函数存在较高离散旁瓣的问题,文中提出一种新的自相关离散旁瓣抑制的多输入多输出雷达OFD-LFM波形设计方法。 首先,确定满足发射信号正交性的最小频率间隔,以该最小间隔对频率范围进行离散分割,构建出发射信号频率编码空间;然后,采用遗传算法和二次规划算法对发射信号频率编码和初相进行同步优化,最终获得使空域合成输出信号自相关旁瓣最小化的各通道信号频率和初相的取值。仿真验证了设计的波形具有较低的自相关旁瓣且满足全向发射的要求。

Aiming at solving the problems that the spatial synthesized signals of orthogonal frequency division-linear frequency modulation(OFD-LFM) waveform have high grating sidelobes, a new multiple input multiple output radar OFD-LFM waveform design method with suppressed grating sidelobes of autocorrelation function is propsoed. Firstly, the least frequency step is determined with which the transmit signals are completely orthogonal. Based on the least frequency step, frequency codes space is constructed. Then the frequency codes and the phases of transmitted signals can be calculated using genetic algorithm and sequential quadratic programming. Simulation results have demonstrated that the obtained waveforms realize the nullification of the grating sidelobes and are completely orthogonal.

TN958