Same-polarization electrooptical-scanning laser imaging radar transmitting system for down-looking synthetic aperture

Abstract

A same-polarization electrooptical-scanning laser imaging radar transmitting system for down-looking synthetic aperture comprises a laser, a half wave plate, an aperture diaphragm, a first polarization beam splitter, a first 1/4 wave plate, a first reflection mirror, a first electrooptical scanner, a first cylindrical mirror, a second reflection mirror, a third reflection mirror, a second electrooptical scanner, a second cylindrical mirror, a second polarization beam splitter, a second 1/4 wave plate, a fourth reflection mirror, a transmitter-telescope primary mirror, a high-voltage power source and a signal generator. The same-polarization electrooptical-scanning laser imaging radar transmitting system is capable of electro-optically scanning cross rails of the same polarization state and ultimately realizing parabolic equipotential line difference of two polarization orthogonal light beams at a far-field target, is used for scanning targets, simple in structure, free of mechanical scanning, small in size, light in weight, and particularly suitable for onboard or satellite-borne high-speed operating carrying platforms, and response speed for electrooptical phase modulation wave surfaces is fast and up to nanosecond level.

Description

technical field [0001] The invention relates to laser radar, in particular to a same-polarized electro-optic scanning direct-looking synthetic aperture laser imaging radar transmitting system. Through the electro-optical effect of the crystal, the linear electro-optical scanning of the same polarization state is performed in the cross-track direction, and the linear term phase modulation of the lateral position of the cross-track to the target point is generated, and the phase modulation is performed in the along-track direction through the cylindrical mirror to generate the along-track to the target point The quadratic term phase history centered on the longitudinal position and the finally obtained polarized orthogonal parabolic equipotential phase difference wavefront are the key technologies for realizing radar two-dimensional plane target imaging. Background technique [0002] The principle of synthetic aperture laser imaging radar is taken from the principle of synthet...

AI Technical Summary

Problems solved by technology

However, the emission system scheme proposed by the direct-looking synthetic aperture lidar is to use two beam deflectors to scan the two beams in opposite directions so that the light field distribution of the inner emission field is in the form of a quadratic spatial phase. Synchronization can obtain the linear phase modulation in the cross-track direction. It is difficult and complicated to make the precise synchronization of the two beams scanning oppositely. Applications on high-speed platforms such as airborne

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