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通过利用最大重叠离散小波变换对信号进行预处理,以减小噪声的功率,从而提高信噪比,使传统的波达估计方法在低信噪比情况下也能正常使用;所用的小波变换方法不要求数据长度为2的整数次方,且具有移位不变性,使得该方法的实用性更强;最后,通过数字仿真试验验证该方法的有效性。 更多还原

【Abstract】 The accurate estimation of direction of arrival from measurements contaminated by noise is important for improving performance of some application system.Although estimation of signal parameters via rotational invariant techniques has good performance in scenarios of high signal to noise ratio,when signal to noise ratio is low,its performance degrades dramatically.In this paper,the measurements of the array are preprocessed with maximal overlap discrete wavelet transform.The noise power is reduc... 更多还原