CAJ | 학술논문

针对 k 维子空间法尺度参数选择的盲目性，提出了基于估计参数的势函数方法。首先根据观测信号估计出基准值 r 1，并根据基准值 r 1选取势函数 f 的尺度参数σ1，由势函数 f 估计出聚类平面后，根据聚类平面估计出基准值 r2，根据基准值 r2选取势函数 g 的尺度参数σ2，并由势函数 g 估计出混合矩阵。该方法充分利用了观测信号的统计特性，实验结果表明，在无噪条件下，该方法比改进前的方法在矩阵估计方面误差减小了75％，较其他方法误差减小了1～2个数量级；在16 dB 信噪比下，该方法比改进前在矩阵估计精度上提高8．7％，源信号个数估计准确率提高了1倍。
침대 k 유자공간법척도삼수선택적맹목성，제출료기우고계삼수적세함수방법。수선근거관측신호고계출기준치 r 1，병근거기준치 r 1선취세함수 f 적척도삼수σ1，유세함수 f 고계출취류평면후，근거취류평면고계출기준치 r2，근거기준치 r2선취세함수 g 적척도삼수σ2，병유세함수 g 고계출혼합구진。해방법충분이용료관측신호적통계특성，실험결과표명，재무조조건하，해방법비개진전적방법재구진고계방면오차감소료75％，교기타방법오차감소료1～2개수량급；재16 dB 신조비하，해방법비개진전재구진고계정도상제고8．7％，원신호개수고계준학솔제고료1배。
A potential function method with estimated parameter is proposed for blindness of scale parame-ter selecting of k-dimensional subspace method.Firstly,the reference value r 1 is estimated based on observed signals and the scale parameterσ1 for potential function f is estimated based on r 1 .When cluster planes are esti-mated by f ,the reference value r 2 is estimated based on them and the scale parameterσ2 for potential function g is estimated based on r 2 .Thus,we obtain the estimation of mixing matrix.This method makes full use of the statistical properties of observed signals.The experiment shows that this method is reduced by 75% in matrix estimation error than the method before improved and is reduced by 1 2 orders of magnitude compared with other methods when there is no noise;the estimated precision is 8.7% higher and the accuracy rate of the source’s number estimation is twice higher.