干扰条件下基于互信息量准则的弹载雷达波形优化

发布时间：2018-11-21 07:10

【摘要】：弹载雷达发射波形设计在导弹制导系统中有着重要作用。为解决复杂电磁环境下,弹载雷达受到噪声、杂波和干扰影响导致目标探测性能降低的问题,基于互信息量(mutual information,MI)准则提出了一种新的同时存在噪声、杂波和电子干扰影响时的发射波形优化算法,通过拉格朗日乘子法得到最大化目标响应与雷达回波间互信息量的最优波形表达式,并利用一阶泰勒级数近似简化该表达式。仿真实验对比了不同杂波和压制干扰、不同发射能量约束下优化前后所获互信息量;结果表明,当平均功率限制为100 W时,相比于原始波形,采用优化信号情况下所获互信息量翻倍。优化发射波形能够通过优化信号的频域能量分布,主动避开干扰和杂波影响大的频率,使接收回波包含更多目标信息。
[Abstract]:The waveform design of missile-borne radar plays an important role in missile guidance system. In order to solve the problem of target detection performance degradation caused by noise, clutter and jamming in complex electromagnetic environment, a new simultaneous noise based on mutual information quantity (mutual information,MI) criterion is proposed. Based on the Lagrange multiplier method, the optimal waveform expression for maximizing the mutual information between the target response and the radar echo is obtained, and the first order Taylor series is used to simplify the expression. The simulation results show that the amount of mutual information obtained before and after optimization is compared with different clutter, suppression interference and different emission energy constraints. The results show that when the average power is limited to 100W, the amount of mutual information obtained by the optimized signal is doubled compared with the original waveform. By optimizing the energy distribution of the signal in frequency domain, the optimized transmitting waveform can avoid the interference and clutter and make the received echo contain more target information.
【作者单位】：空军工程大学信息与导航学院;95486部队;国防科技大学电子科学与工程学院;
【基金】：国家自然科学基金(61302153) 航空基金(20140196003) 航天科技创新基金(CASC020302)~~
【分类号】：TN957.51

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