Abstract:

When radar is working in a complex environment, the performance of conventional algorithms degenerates. New frequency spectrum estimation methods based on Fractional Lower Order Statistics (FLOS) covariation about radar were proposed: FLOS-direct method, FLOS-indirect method, FLOS-welch method, FLOS-music method. By estimating the sinusoidal signals embedded in the stable noise, the method in this paper is robust in both Gauss and non-Gauss environments.

Key words: non-Gauss, spectrum estimation, α stable distribution, fractional order covariation

摘要：

雷达工作在复杂的环境下,回波常伴有α稳定分布噪声,特别是当非高斯性较强时,传统的谱估计方法将退化,甚至不能工作。为此,提出了四种基于FLOS共变的雷达回波频率谱估计新方法：FLOS-直接法、FLOS-间接法、FLOS-welch法、FLOS-music法。通过对α稳定分布噪声中正弦信号频率估计的仿真结果表明,所提出的方法不论雷达杂波是传统分布还是非高斯的α稳定分布,均具有较好的工作韧性。

关键词: 非高斯, 谱估计, α稳定分布, 分数阶共变