Communications – electrical: acoustic wave systems and devices – Receiver circuitry
Patent
1993-09-22
1996-07-16
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
367901, 364517, 36472419, G01S 1566
Patent
active
055373682
ABSTRACT:
An adaptive statistical filter system for receiving a data stream comprising a series of data values from a sensor associated with successive points in time. Each data value includes a data component representative of the motion of a target and a noise component, with the noise components of data values associated with proximate points in time being correlated. The adaptive statistical filter system includes a prewhitener module, a plurality of statistical filters of different orders and a selection module. The prewhitener module receives the data stream from the sensor and generates a corrected data stream comprising a series of corrected data values each associated with a data value of the data stream, each including a data component and a noise component with the noise components of data values associated with proximate points in time being decorrelated. The plural statistical filters are coupled to receive the corrected data stream in parallel from the prewhitener. Each statistical filter generates coefficient values to fit the corrected data stream to a polynomial of corresponding order and fit values representative of the degree of fit of corrected data stream to the polynomial. The selection module receives the fit values and coefficient values from the plural statistical filters and selects coefficient values from one of the filters in response to the fit values. The coefficient values are coupled to target motion analysis module which determines position and velocity of the target.
REFERENCES:
patent: 5027413 (1991-06-01), Barnard
patent: 5144595 (1992-09-01), Graham et al.
patent: 5247470 (1993-09-01), McKown et al.
Soni et al., "Adaptive Whitening Filters For Small Target Detection"', Pr SPIE-Int. Soc. Opt. Eng. (USA), vol. 1698, pp. 21-31, 1992, ISSN 0277786X.
Gong Kai F.
Graham Marcus L.
Hammel Sherry E.
O'Brien, Jr. Francis J.
Lall Prithvi C.
Lobo Ian J.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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