Patent ID: 7675610
Filing Date: 2010-03-09
Classification: G01C,G01S

Abstract:
1. A ladar system comprising: a chirp generator for generating a chirped waveform; a laser for transmitting a light signal toward a target, the light signal being modulated by the chirped waveform; a photon-counting sensor for receiving a temporally-modulated photon stream corresponding to the modulated light signal being reflected from the target and toward the ladar system, the photon-counting sensor being gated relative to the chirped waveform, wherein the photon-counting sensor is gated by a rectangular waveform having a frequency synchronized to the chirped waveform; a hard limiter for receiving the chirped waveform and producing the rectangular waveform for gating the photon-counting sensor; and wherein the photon-counting sensor mixes the temporally-modulated photon stream with a rectangular waveform having a frequency synchronized to the chirped waveform.