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循环谱密度估计的最大似然滤波器法 被引量:1
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作者 王成毅 王宏禹 《大连理工大学学报》 CAS CSCD 北大核心 1998年第6期711-716,共6页
针对周期平稳随机过程的循环谱密度的估计过去主要采用时域平均周期图法和频域平滑周期图法,特别当短数据时,上述方法的分辨率很低,方差极大,提出了循环谱密度估计的最大似然滤波器法,并作了改进.该方法不仅具有很高的分辨率,而... 针对周期平稳随机过程的循环谱密度的估计过去主要采用时域平均周期图法和频域平滑周期图法,特别当短数据时,上述方法的分辨率很低,方差极大,提出了循环谱密度估计的最大似然滤波器法,并作了改进.该方法不仅具有很高的分辨率,而且估计的方差也很小,具有较好的估计性能. 展开更多
关键词 循环谱密度 估计 最大似然滤波器 平稳过程
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A novel estimation algorithm for torpedo tracking in undersea environment 被引量:1
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作者 D.V.A.N.RAVI KUMAR S.KOTESWARA RAO K.PADMA RAJU 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第3期673-683,共11页
A novel estimation algorithm is introduced to handle the popular undersea problem called torpedo tracking with angle-only measurements with a better approach compared to the existing filters. The new algorithm produce... A novel estimation algorithm is introduced to handle the popular undersea problem called torpedo tracking with angle-only measurements with a better approach compared to the existing filters. The new algorithm produces a better estimate from the outputs produced by the traditional nonlinear approaches with the assistance of simple noise minimizers like maximum likelihood filter or any other algorithm which belongs to their family. The introduced method is extended to the higher version in two ways. The first approach extracts a better estimate and covariance by enhancing the count of the intermediate filters, while the second approach accepts more inputs so as to attain improved performance without enhancement of the intermediate filter count. The ideal choice of the placement of towed array sensors to improve the performance of the proposed method further is suggested as the one where the line of sight and the towed array are perpendicular. The results could get even better by moving the ownship in the direction of reducing range. All the results are verified in the MATLAB environment. 展开更多
关键词 estimation algorithm torpedo tracking angle-only measurements line of sight maximum likelihood filter
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