基于双阶段互信息准则的多目标检测波形设计

Waveform design based on two-stage mutual information for multi-target detection

在有限信噪比情况下,雷达对多目标的检测性能受限于参数估计精度和发射脉冲积累,而波形设计为雷达性能提升提供了自由度。本文以信噪比为约束条件,以假设概率与设计波形的加权和迭代波形发射,分阶段提出了基于单假设互信息最大化、基于多假设间互信息最小化的波形优化方法,实现了提升参数估计精度与降低发射脉冲次数的均衡处理。仿真验证了目标参数估计精度与目标检测性能间呈正相关关系,结果表明,基于双阶段互信息准则设计的波形能够快速检测多目标方位,提升目标检测性能。

In the case of limited signal-to-noise ratio,the radar’s detection performance for multiple targets is limited by parameter estimation accuracy and transmit pulse accumulation,and the waveform design provides a degree of freedom for radar performance improvement.In this paper,under the constraint of signal-to-noise ratio,the weighted sum of the hypothesis probability and the designed waveform is used to transmit the waveform iteratively,the waveform optimization method based on the mutual information maximization of a single hypothesis and the mutual information minimization between multiple hypotheses are proposed in stages.Parameter estimation accuracy improvement and the number of transmitted pulses reduction are realized.The simulation verifies the positive correlation between the target parameter estimation accuracy and the target detection performance.The results show that the waveform designed based on the two-stage mutual information criterion can quickly detect the orientation of multiple targets and improve the target detection performance.