摘要
功率倒置法由于具有稳健的干扰抑制能力而被广泛应用,但在采样快拍数少、信噪比高时,会使方向图主瓣偏移甚至在目标方向形成凹口,导致波束性能下降,使用对角加载技术可以有效地改善波束形成的稳健性。以往的对角加载技术只是研究分析了均匀加载值对方向图畸变的影响。通过对非均匀对角加载的仿真分析,得出非均匀对角加载对阵列性能的影响,如主瓣宽度、主副比、零陷深度和信号增益的变化,从而可以根据实际需要来选择不同的加载方式。
The power inversion algorithm is robust to reject interference in theory. But the fewer snapshot and high SNR will lead to the estimation error of the covariance matrix, which will cause the main-lobe of beampatterns excursion, even the targets will be suppressed, and so the performance of beam will decline. Diagonal loading is an effective method to improve the robust performance, Most work for diagonal loading has traditionally been focused on the selection of the loading-value, and the loading value is the same for all sensors. When the loading value is different for all sensors, the performances of beamforming are analyzed. Many simulations with non-uniform loading-values on covariance matrix are given. The performances, such as the mainlobe width, main-lobe to maximum side-lobe rate, null depth and signal power gain and so on, are analyzed in detail.
出处
《航天电子对抗》
2013年第2期39-42,64,共5页
Aerospace Electronic Warfare
关键词
功率倒置法
采样协方差矩阵
对角加载
非均匀
power inversion algorithm
sampling covariance matrix
diagonal loading
non-uniform
