Device and method for enhancing signal-noise ratio of laser echo signal for laser distance measuring

Abstract

The invention discloses a device for enhancing a signal-noise ratio of a laser echo signal for laser distance measuring. The device is used for receiving and transmitting laser echo or backward scattering light of laser, and comprises a telescope, a gain pumping amplifying module, an acoustic-optical deflection modulator, a small-hole diaphragm, a collimating mirror and a detector which are sequentially arranged on an optical axis along the optical path of the laser echo. The device has the advantages that by arranging the acoustic-optical deflection modulator, the laser echo and the atmosphere backward scattering light can be separated, so as to avoid the atmosphere backward scattering light; by arranging the gain pumping amplifying module, the light of the laser echo can be amplified, the intensity of the laser echo is enhanced, the noise of the backward scattering light is reduced, and the signal-noise ratio is increased.

Description

technical field [0001] The invention belongs to the field of laser distance measurement, and more specifically relates to a laser echo optical amplification and signal-to-noise ratio enhancement device and enhancement method for a space debris distance measurement system. Background technique [0002] With the advancement of space technology, human activities in peaceful space are also increasing, but more and more space debris is also produced. Space debris refers to all man-made objects in orbit except normal working spacecraft, including the completion of missions. The rocket body and satellite body, rocket jets, discarded objects during space missions, debris generated by collisions between space objects, etc., are also called "space junk". At present, there are hundreds of millions of space debris above the millimeter level in space, and the total number reaches several thousand tons. More than 6,500 spacecraft have been launched into the air around the world, and more ...

AI Technical Summary

Problems solved by technology

Using the cooperative target (satellite) relay optical amplification method, the laser is enhanced at the cooperative target (satellite), which improves the intensity of the laser echo signal, but the cooperative target (satellite) carries an optical amplifier to amplify the laser signal. Occupies the volume, weight, and power consumption of the cooperative target itself, increases the cost of the cooperative target, and requires complex structures, especially the cost of satellites, and for uncontrollable non-cooperative targets such as space debris, it is generally impossible to carry relays optical amplification system

At the same time, the single use of relay light amplification can not avoid the backscattering and other noise light received by the ground.

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