The invention provides a measuring device and method for the
target line-of-
sight angel offset and distance. The device is composed of a four-quadrant avalanche
photodetector, a receiving and sending optical unit, a
noise compensation circuit, a four-circuit front amplification circuit, a video amplification circuit, an automatic
gain amplification circuit, a peak keeping circuit, an AD conversion circuit, a
laser, a dominant wave sampling circuit, a summing circuit, a time identifying circuit, a time test circuit and a digital
processing circuit, wherein the receiving and sending optical unit enables narrow pulse
laser rays emitted by the
laser to be converged on the photoelectric
detector to form echo light spots after target reflection, photovoltaic conversion of the four-quadrant avalanche
photodetector, front amplification, video amplification and automatic
gain amplification are conducted, narrow-pulse peak keeping is conducted, transmission of the AD conversion circuit is conducted, and the digital
processing circuit extracts the
digital line-of-
sight angel offset; summing is conducted on the four-circuit front amplification circuit, the dominant wave sampling circuit is combined, the time identifying circuit determines laser emitting and echo coming and returning time, the time is transmitted to the time identifying circuit to be measured, and the digital
processing circuit
decodes the corresponding distance.