Doublet pulse coherent laser radar for precision range and veloc

Details Doublet pulse coherent laser radar for precision range and veloc Doublet pulse coherent laser radar for precision range and veloc

1997-05-27

1998-09-29

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 28, G01C 308

Patent

active

058152504

ABSTRACT:
In a laser radar (lidar) system, a Doublet Pulse is generated by injection-seeded aborted cavity dumping of a solid-state laser. The doublet pulse provides coherent Doppler lidar systems a substantial time bandwidth product (TB) with a very modest processing requirement. The waveform format comprises a pair of pulselets, each of duration .tau., separated by T seconds. The range resolution is governed by the pulselet duration .tau., while the velocity precision is governed by one over the pulselet separation, T. Ambiguities in the velocity measurement arise as a result of the periodic structure of the waveform and occur every .lambda./2T m/sec, where .lambda. is the operating wavelength. These ambiguities are removed by conventional de-aliasing algorithms as well as through the generation and processing of higher order pulse waveforms.

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Zrnic, Dusan S., "Estimation of Spectral Moments for Weather Echoes", IEEE Transactions on Geoscience Electronics, Oct. 1979, vol. GE-17, pp. 113-128 .

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