Communications: directive radio wave systems and devices (e.g. – With particular circuit – Spectrum analysis
Patent
1995-09-01
1998-02-10
Buczinski, Stephen C.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Spectrum analysis
324 7637, 342132, 359305, 367 64, G01R 2317, G01S 1308, G01S 1300, G02F 133
Patent
active
057174016
ABSTRACT:
An active recognition system comprises a transceiver, tracking electronics, an optical processor, and a data handler. The transceiver transmits tracking electronics controls the transceiver to determine object range for gating the optical processor. The optical processor includes a local spatial frequency of the acoustic waveform within the modulation aperture of the signal Bragg cell. At a first focal plane, the light defines a one-dimensional light distribution that includes moving spots that correspond to respective reflection replicas. A chirp-compensating the effective focal length of the chirp signal! collimates the light diverging from the moving spots for subsequent focusing by a "transform" linear sweep,! sweeps the beam orthogonal to the direction of spot movement to provide a two-dimensional distribution at the final focal plane in which each reflection replica is represented as a diagonal trace. A charge-coupled-device at the focal plane captures the distribution for object by matching the acquired two-dimensional light distribution with probable recognition.! The two-dimensional distribution provides for more sophisticated matching across different object orientations in real time. Since the two-dimensional distribution is acquired in real time, the present invention provides improved object recognition where recognition speed is critical.
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Cohoon Robert L.
Sabet-Peyman Farhang
Buczinski Stephen C.
Gillmann Harold E.
Litton Systems Inc.
Rotella Robert F.
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