Method and apparatus for reducing the noise in the receiver of a

Details Method and apparatus for reducing the noise in the receiver of a Method and apparatus for reducing the noise in the receiver of a

1997-12-08

1999-08-31

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 501, G01C 300

Patent

active

059460814

ABSTRACT:
A method and apparatus for reducing the noise of a laser range finder. The laser range finder includes a high voltage silent circuit, a logarithmic amplifier and a sun noise averaging amplifier. The high voltage silent circuit shuts down the switched power supply controller of the high voltage power supply to reduce the noise coupled from the high voltage power supply when the receiver of the laser range finder is in a receiving mode. The logarithmic amplifier provides dynamic gain control for the receiver to avoid signal saturation and improve the signal to noise ratio of the received signal. The sun noise averaging amplifier provides an amplified average sun noise which automatically adjusts the threshold voltage of detecting the distance signal from a target.

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