Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1993-10-04
1994-12-27
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
367127, 367129, G01S 518
Patent
active
053771621
ABSTRACT:
A real time passive trajectography device comprises at least three pairs of ensors. Each pair of sensers is separated from the other pairs of sensors by a distance which is greater than the distance separating each of the sensors of the pair. One of the pairs of sensors is roughly aligned with the currently determined trajectory while other pairs of the sensors are aligned at 0.degree. to 30.degree. from the perpendicular to the current trajectory. Of each pair of sensors, the output signal from a first sensor is used as a reference signal. The output signal from a second sensor is compared to the output signal of the first signal based on a presumed speed of the object being tracked. The presumed speed is continually updated until a maximum correlation between the first and second output signals is obtained. The measurement and correlation operation is repeated at predetermined intervals, with the initial presumed speed extrapolated from the trajectory previously computed during previous intervals. Prior to the speed analysis, the output signals from the sensors are digitized. The output signals are then homogenized and made coherent by a white noise operation to free the information content of the signals from their power throughput. In order to achieve approximate real time operation, a computer for performing the signal analysis includes vectorial cards and has a parallel architecture.
REFERENCES:
patent: 5036498 (1991-07-01), Cappel
Becera Richard
Charpentier Etienne
Filipowicz Alain
Jestin Vincent
L'Etat Francais (represented by the Deleque General for l'Armeme
Pihulic Daniel T.
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