Laser Synthetic Aperture Imaging System

Abstract

The invention relates to a laser synthetic aperture imaging system suitable for high-resolution imaging of geosynchronous orbit satellites or dim targets outside the atmosphere, which consists of a laser emitting device and a receiving device, and the laser emitting device is emitted by a laser The beam passes through the combination of 6 beam splitters, 3 acousto-optic frequency shifters and 3 collimated beam expanders to simultaneously emit three coherent emission beams with the same polarization direction and different frequencies. Its receiving device is composed of a main condenser, a sub-condenser, a compression lens group, a narrow-band filter, a weak light detector, a data acquisition device and a computer; The light beam converged by the condenser lens and the compression lens group is incident on the low-light detector through the narrow-band filter, and the target signal after photoelectric conversion is time-demodulated and phase-closed by the data acquisition equipment and computer to finally reconstruct a clear target image.

Description

Laser Synthetic Aperture Imaging System technical field The invention belongs to deep-space faint target detection imaging equipment, in particular to a laser imaging system suitable for high-resolution imaging of satellites in geosynchronous orbits and high-resolution imaging of faint targets outside the atmosphere. Background technique There are no reports of ground-based imaging systems capable of high-resolution imaging of geosynchronous orbit satellites or other relatively geostationary faint targets. Traditional large-aperture adaptive telescopes can overcome the influence of atmospheric disturbances to image distant stars, but they need a luminous source near the target as a reference light source, and the target magnitude is required to be higher than that of geosynchronous orbit satellites and targets at similar distances. Magnitude (approximately 15th magnitude). So it is not suitable for imaging targets in geosynchronous orbit. Long-baseline radio telescopes...

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so not suitable for imaging targets in geosynchronous orbit

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