Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1997-01-14
1998-12-08
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, H01S 300
Patent
active
058478175
ABSTRACT:
A method for compensating a reference signal used in a coherent receiver of a micro-doppler sensor having a transmitter includes the steps for: (a) repeatedly measuring phase differences between a signal emitted by the transmitter a first time and a previous signal emitted at a previous time so as to produce a plurality of phase error signals; (b) accumulating the phase error signals over a propagation time between the transmitter and the coherent receiver so as to produce a cumulative phase error signal; and (c) modulating a signal produced by the transmitter at the end of the propagation period so as to generate a compensated reference signal having a phase characteristic substantially identical to the signal produced by the transmitter at the beginning of the propagation period. A phase error or noise compensator, which can form part of a micro-doppler ladar system, is also described.
REFERENCES:
patent: 5151747 (1992-09-01), Nourrcier
patent: 5267011 (1993-11-01), Callender
patent: 5534993 (1996-07-01), Ball et al.
patent: 5621514 (1997-04-01), Paranto et al.
Hollister Jack H.
Rice Robert R.
Zediker Mark S.
Hellner Mark
McDonnell Douglas Corporation
Powell Jr. Raymond H.J.
Westerlund Robert A.
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