Automatic noise threshold determining circuit and method for a l

Optics: measuring and testing – Range or remote distance finding – With photodetection

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356 505, 342203, 342134, 367127, G01C 308, G01S 1308

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active

056127790

ABSTRACT:
An automatic noise threshold circuit and method automatically sets an operating threshold for a signal receiving section of a laser pulse transmitting device such that a constant noise pulse firing rate is output from a detector to provide maximum return signal sensitivity and enable detection of the weakest possible laser pulse in order to obtain maximum performance out of a laser range finder. The circuit sets the noise pulse rate at that point at which, in conjunction with a firmware based process, the actual return signals from the target can be discrimintated from the accompanying noise.

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