Method for resisting backward dispersion for laser semi-active seeker

Abstract

The invention discloses a method for resisting backward dispersion for a laser semi-active seeker. The laser semi-active seeker is used for automatically searching, intercepting and tracking a ground fixed / moving target by the adoption of diffuse-reflected laser of a target. Laser on a transmitting path is attenuated due to suspended matters in the atmosphere, and an echo signal formed by backward dispersion of the atmosphere may interfere the capture of a target signal by the seeker. According to the method, the technology of wave gate is used for dividing the backward dispersion light and the target reflection light in different distances according to a sequence of time, so that the target reflection light is enabled to reach and image in gating time of a laser receiver, and the seeker is ensured to accurately capture target echo. By the adoption of the method for resisting backward dispersion, the seeker can be used for overcoming backward dispersion in bad weather conditions of low brightness, poor atmosphere transmission characteristics or serious backward dispersion and the like, thus a signal-to-noise rate of laser imaging is improved, and the function of filter on an interference target is further provided.

Description

technical field [0001] The invention relates to an anti-backscattering method for a laser semi-active seeker. The interference caused by atmospheric backscattering to the target signal captured by the seeker can be suppressed by using the range gate technology. It is mainly used in the laser semi-active seeker. use on. Background technique [0002] When the laser seeker is working, the airborne laser irradiator first emits a laser beam to the target, and then uses the laser detector to receive and process the laser signal reflected by the target, and finally completes the target detection. Taking ranging as an example, the missile's distance from the target is calculated by measuring the time required from the emission of a laser pulse to the reception of the reflected laser pulse from the target. The main factors affecting its accuracy are laser pulse width and circuit time resolution or delay. Since the laser pulse width can be set to nanosecond level, with the improvemen...

AI Technical Summary

Problems solved by technology

[0003] However, the main disadvantage of the laser seeker is that it is greatly affected by the atmospheric environment. The absorption and backscattering of the laser by clouds, rain and snow will interfere with the normal work of the seeker.

Atmospheric molecules and atmospheric suspended matter are composed of water droplets and dust crystals with a radius of several microns to tens of microns, which not only attenuate the laser on the transmission path, but also may interfere with the echo signal formed by the backscattering of the atmosphere The laser detector captures the target signal, and then the seeker loses the target or tracks the wrong target

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