Wide-scroll direct vision synthetic aperture laser imaging radar

Abstract

The invention relates to a wide-scroll direct vision synthetic aperture laser imaging radar. The wide-scroll direct vision synthetic aperture laser imaging radar comprises a laser light source, a polarization controller, an aperture diaphragm, a conversion lens, a scanning controller, a transmitting polarization beam splitter, a horizontal polarized light path conversion lens, a horizontal polarized light path distance delayer, a vertical polarized light path conversion lens, a vertical polarized light path wave surface reverser, a transmitting polarization beam combiner and a transmitting telescope primary mirror; and a receiving end comprises a receiving telescope, a receiving polarization beam splitter, a 2*490-degree optical bridge, an in-phase channel balance detector, an in-phase channel analog-to-digital converter, a 90-degree phase shift channel balance detector, a 90-degree phase shift channel analog-to-digital converter, a complexification processor, a digital image processor and a control computer. The wide-scroll direct vision synthetic aperture laser imaging radar keeps all characteristics, and has the advantages of simple motion scanning form, high control accuracy, capability of realizing wide-scroll high-resolution imaging and the like.

Description

technical field [0001] The invention relates to a synthetic aperture laser radar, in particular to a wide-strip direct-looking synthetic aperture laser imaging radar, which can obtain a wide-strip direct-looking synthetic aperture laser imaging radar by making full use of laser energy and simply controlling cross-track scanning. Background technique [0002] The principle of synthetic aperture laser imaging radar is taken from the principle of synthetic aperture radar in the radio frequency field, and it is the only optical imaging observation method that can obtain centimeter-level imaging resolution at long distances. The traditional synthetic aperture imaging lidar is based on the necessary working conditions of the side view synthetic aperture imaging lidar. The side-view synthetic aperture imaging lidar adopts optical heterodyne reception, which is greatly affected by atmospheric disturbance, vibration of the moving platform, target speckle and the phase change of the li...

AI Technical Summary

Problems solved by technology

However, the direct-looking synthetic aperture laser imaging radar uses two beam deflectors to scan the two beams in opposite directions and requires precise synchronization. It is difficult and complicated to make the precise synchronization of the two beams in the opposite direction. Or under the circular aperture, the optical toe produced by the far-field target surface is also square or circular. At this time, the cross-track width of the effective banner is smaller than the along-track width, which is actually a narrow-band banner imaging. At the same time, the cross-track width The orbital resolution is also lower than the along-orbital resolution, which seriously affects the imaging quality

In order to obtain a wide far-field spot in the prior art, only a rectangular aperture diaphragm with a cross-track direction larger than the down-track direction can only be used for rectangular cutting of the energy of the laser (generally, the energy emitted by the laser is concentrated in the central circular area) , the energy loss is serious and cannot be fully utilized

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