Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1990-05-18
1991-07-30
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
367124, 367118, G01S 380
Patent
active
050364987
ABSTRACT:
A method for determining the motion of a target in underwater acoustics by means of an antenna with misaligned sensors (C.sub.1, C.sub.2.sup.P, C.sub.3) provided with a central sensor C.sub.2.sup.P. It consists in estimating the characteristics of velocity (V.sub.x, V.sub.y) and position of the target x(t*), y(t*) relatively to the antenna by means of a likelihood maximum estimator taking account of the differences in propagation times measured between the wave fronts transmitted by the target and reaching the sensors. The motion estimator is initialized by means of an initial state vector X determined on the basis of the values of the azimuths of the target perceived from the mid-points of each pair of sensors, during a determined number of measurements staggered in time. The action of the state vector X takes place in taking account of the value of the elevation of the target with respect to the antenna.
REFERENCES:
patent: 4162474 (1979-07-01), Broder et al.
Journal of the Acoustical Society of America, vol. 76, No. 4, Oct. 1984, pp. 1114-1122, Acoustical Society of America, New York, U.S.; F. Dommermuth et al.: "Estimating the trajectory of an accerlationless aircraft by means of a stationary acoustic sensor".
Journal of Acoustical Society of America, vol. 70, No. 4, Oct. 1981, pp. 1054-1061, New York, U.S.; J. C. Hassab et al.: "Estimation of location and motion parameters of a moving source observed from a linear array".
"Thomson-CSF"
Pihulic Daniel T.
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