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本文从理论分析与计算机模拟两个方面研究了在动态情况下两类自适应谱估值器的检测性能。导出了衡量它们的检测性能的一个更精确的表达式——检测能力函数,由此给出了在低信噪比情况下自适应滤波器参数选取的基本原则。与文献[2]、[4]中的最佳步长和最佳阶数的确定方法相比,采用本文导出的方法可以得到更好的检测性能。
This paper studies the detection performance of two kinds of adaptive spectrum estimators from two aspects of theoretical analysis and computer simulation under dynamic conditions. A more accurate expression of the detection capability, a measure of their detection performance, is derived, giving the basic principle of adaptive filter parameter selection at low signal-to-noise ratios. Compared with the determination of the best step size and the best order in references [2] and [4], we can obtain better detection performance by using the method derived in this paper.