Hyperbolic wavefront difference self-scanning direct-looking synthetic aperture imaging lidar

Abstract

Hyperbolic wave forward difference self-scanning direct-view synthetic aperture laser imaging radar comprises a continuous laser source, an emission polarization beam splitter, a left arm rear space phase converter, a left arm aperture diaphragm, a left arm front space phase converter, a right arm rear space phase converter, a right arm aperture diaphragm, a right arm front space phase converter, an emission polarization beam combiner, an emission primary mirror, a receiving telescope, a polarization interference autodyne photoelectric receiver, an AD converting and preprocessing device, an echo data storer and a computer. According to the hyperbolic wave forward difference self-scanning direct-view synthetic aperture laser imaging radar, a light modulator is not needed, synchronous correlation of light and electrons during emission and receiving is not needed, the structure is quite simple, the influence of echo delay is avoided, system receive sensitivity is quite high, and the inherent advantages of direct-view synthetic aperture laser imaging radar are reserved. The hyperbolic wave forward difference self-scanning direct-view synthetic aperture laser imaging radar is suitable for observation and imaging from space to earth under various relative movement speeds and operating ranges and detection of spatial moving targets in the aerospace field and is based on the retrosynthesis aperture principle.

Description

technical field [0001] The invention relates to a laser radar, which is a hyperbolic wavefront difference self-scanning direct-looking synthetic aperture laser imaging radar. In principle, a spatial phase converter is used to convert the laser wave surface into a laser radar that includes cross-track and along-track coordinates coupled The compound hyperbolic wavefront of the hyperbolic wavefront difference and the quadratic phase wavefront difference in the along-track direction, the relative motion of the target automatically scans in the cross-track direction to generate linear phase modulation related to the lateral distance of the target surface, and at the same time generates the linear phase modulation of the target in the along-track direction. Orbital distance-dependent quadratic phase history. The system structure adopts polarization orthogonal coaxial dual-beam projection imaging emission and polarization interference self-difference photoelectric detection and rece...

AI Technical Summary

Problems solved by technology

[0005] During the operation of the above-mentioned direct-looking synthetic aperture imaging lidar and side-looking synthetic aperture imaging lidar, the operating distance of the target will generate a time delay of the echo signal, but when the delay of the echo signal exceeds the emission pulse period, the laser emission signal need to seek and identify its associated echo pulse, this complex technique limits the range of the radar, making it difficult for long-distance detection

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