Receiver-transmitter for a target identification system
First Claim
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1. A receiver-transmitter for a target identification system, includinglaser means for generating and focusing a laser beam for transmission to a reflective surface of a target to be identified;
- collection means for collecting a reflected signal from the target and producing a collected signal having collected beams;
an array of photodetectors, at least one of the photodetectors having the collected signal focused thereon;
generation means, connected to an output of the laser means, for generating a frequency-shifted reference beam from the laser beam;
beam division means for dividing the reference beam into a number of separate reference beams each having substantially equal power; and
beam splitting means for causing each of the reference beams to be focused onto a separate one of the photodetectors of the array, the focusing of the collected signal onto the photodetector array being such that the reference and collected beams incident on the same photodetector are collinear.
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Abstract
A receiver-transmitter for a target identification system having a particular but not necessarily an exclusive application for the identification of aircraft which utilizes laser vibrometry and a coherent array receiver including an array of photodetectors adapted to receive signals from different parts of the target and to use a corresponding array of frequency-offset reference beams to provide coherent detection of each of the received signals.
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Citations
20 Claims
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1. A receiver-transmitter for a target identification system, including
laser means for generating and focusing a laser beam for transmission to a reflective surface of a target to be identified; -
collection means for collecting a reflected signal from the target and producing a collected signal having collected beams; an array of photodetectors, at least one of the photodetectors having the collected signal focused thereon; generation means, connected to an output of the laser means, for generating a frequency-shifted reference beam from the laser beam; beam division means for dividing the reference beam into a number of separate reference beams each having substantially equal power; and beam splitting means for causing each of the reference beams to be focused onto a separate one of the photodetectors of the array, the focusing of the collected signal onto the photodetector array being such that the reference and collected beams incident on the same photodetector are collinear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification