Patent ID: 6469778
Filing Date: 2002-10-22
Classification: G01S

Abstract:
A coherent laser radar system comprising:a pulsed laser for oscillating a single wavelength pulsed laser beam; optical dividing means for dividing the pulsed laser beam oscillated by said pulsed laser, and for outputting first part of the pulsed laser beam as a transmitted beam and second part of the pulsed laser beam as a local beam; transceiver optical means for transmitting the transmitted beam to a target, and for receiving a light beam from the target as a received beam; a delay line for delaying the local beam output from said optical dividing means; optical coupling means for coupling the received beam with the local beam output from said delay line; a photodetector for carrying out coherent detection of a light beam output from said optical coupling means; and a signal processor for obtaining physical information about the target from the signal passing through the coherent detection by said photodetector, wherein said delay line further comprises: an optical divider for dividing the local beam output from said optical dividing means into n local beams, where n is a positive integer greater than one; n delay lines for providing the n local beams with different delay times; and an optical coupler for coupling the n local beams delayed by said n delay lines.