[특허]Adaptive statistical filter providing improved performance for target motion analysis noise discrimination

Adaptive statistical filter providing improved performance for target motion analysis noise discrimination 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-015/66
출원번호	US-0825909 (1992-01-27)
발명자 / 주소	Graham Marcus L. (North Kingstown RI) O\Brien Francis J. (Newport RI)
출원인 / 주소	The United States of America as represented by the Secretary of the Navy (Washington DC 06)
인용정보	피인용 횟수 : 30 인용 특허 : 0

초록 ▼

The adaptive statistical filter providing improved performance target motion analysis noise discrimination of the present invention includes a bank of parallel Kalman filters. Each filter estimates a statistic vector of specific order, which in the exemplary third order bank of filters of the preferred embodiment, respectively constitute coefficients of a constant, linear and quadratic fit. In addition, each filter provides a sum-of-squares residuals performance index. A sequential comparator is disclosed that performs a likelihood ratio test performed pairwise for a given model order and the next lowest, which indicates whether the tested model orders provide significant information above the next model order. The optimum model order is selected based on testing the highest model orders. A robust, unbiased estimate of minimal rank for information retention providing computational efficiency and improved performance noise discrimination is therewith accomplished.

대표청구항 ▼

An optimum statistical filter coupled between a data sensor providing noise-corrupted measurement data representative of a target remote from the data sensor and a target motion analysis processing module providing improved performance for target motion analysis noise discrimination, comprising: plural statistical filter means of different orders coupled in parallel to the data sensor and each responsive to the measurement data for providing first signals having a different predetermined number of coefficients, the number corresponding to the order of respective ones of the adaptive statistical filter means, representative of the fit of predetermined different order polynomials, the order corresponding to the order of respective ones of the adaptive statistical filter means, to the same measurement data, and for providing plural second signals representative of degree of fit of the predetermined different order polynomials to the same measurement data; sequential comparator means coupled to said plural statistical filter means and responsive to said second signals for providing plural third signals respectively representative of any difference to within a predetermined threshold of corresponding ones of highest and next-to-highest order second signals in accord with a predetermined relation; and optimum model order and parameter estimator module means coupled to the sequential comparator means and responsive to said plural third signals for selecting as optimum respectively (i) in the event the third signals exhibit a difference beyond the predetermined threshold the higher order first signal of the plural statistical filter means corresponding to that third signal that first exhibits a difference beyond the predetermined threshold, and (ii) in the event that the third signals exhibit no difference beyond the predetermined threshold the lowest order first signal of the plurality of statistical filter means.

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Adaptive statistical filter providing improved performance for target motion analysis noise discrimination 원문보기

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Adaptive statistical filter providing improved performance for target motion analysis noise discrimination 원문보기

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