Four-quadrant laser signal detection device

Abstract

A four-quadrant laser signal detection device comprises a four-quadrant PIN photodiode, a bias voltage filter circuit, a first-stage transimpedance amplification circuit and a second-stage variable gain amplification circuit, wherein the four-quadrant PIN photodiode is used for converting a laser echo signal reflected by a measured target into a photocurrent signal; the output end of the bias voltage circuit is connected with the input end of the four-quadrant PIN photodiode, and the bias voltage circuit is used for adjusting the responsivity of the four-quadrant PIN photodiode; the first-stage transimpedance amplification circuit and the second-stage variable gain amplification circuit form a total amplification circuit which is connected to the output end of the four-quadrant PIN photodiode. According to the detection device, a larger dynamic range can be obtained by adjusting the bias voltage of the PIN photodiode and the gain of the second-stage amplification circuit, the effective tracking distance can be increased, early capture of a target is facilitated, and the blind area distance can be reduced.

Description

technical field [0001] The invention belongs to the technical field of laser signal detection, and in particular relates to a four-quadrant laser signal detection device. Background technique [0002] Laser semi-active detection is the earliest, most mature and widely used guidance technology in laser guidance applications. It uses an independent laser irradiator to irradiate the target object, and realizes target positioning by receiving and using the echo signal diffusely reflected by the target. and tracking. During the flight process of the tracker approaching the target from far to near, the energy change of the reflected echo signal is greater than 10 6 times the input range, if the follow-up amplifier circuit adopts fixed gain mode, when the energy of the echo signal is large, the output voltage of the rear end reaches the limit output of the op amp chip, resulting in saturation, which increases the detection blind zone; when the energy of the echo signal is small, i...

AI Technical Summary

Problems solved by technology

During the flight process of the tracker approaching the target from far to near, the energy change of the reflected echo signal is greater than 10 6 times the input range, if the follow-up amplifier circuit adopts fixed gain mode, when the energy of the echo signal is large, the output voltage of the rear end reaches the limit output of the op amp chip, resulting in saturation, which increases the detection blind zone; when the energy of the echo signal is small, it may The effective signal is lost, which reduces the effective tracking distance

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