Transceiver-type integrated inverse synthetic aperture lidar system based on acousto-optic frequency shifter
An inverse synthetic aperture and lidar technology, which is used in radio wave measurement systems, instruments, and re-radiation of electromagnetic waves. It can solve the problems of low signal-to-noise ratio and low resolution, and achieve the effect of efficient reception and analysis.
Active Publication Date: 2018-01-26
XIDIAN UNIV
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[0022] The present invention will be further described below in conjunction with the embodiments and with reference to the accompanying drawings.
[0023] See figure 1 .
[0024] The transceiver-type integrated inverse synthetic aperture lidar system based on the acousto-optic frequency shifter includes a laser 1, and the laser beam emitted by the laser 1 is split into a first beam and a second beam by a polarization beam splitter 2, wherein the first beam passes through the first The corner cube prism 3 reflects and passes through the fiber grating 4 and reaches the first beam splitting prism 5 to be divided into a third light beam and a fourth light beam;
[0025] The third light beam is reflected without interfering with the whole system. The fourth light beam is incident on the 1 / 4 wave plate 6 and passes through the first aperture 7 to the telescopic system 8. Dichroic prism 5 and is divided into the fifth light beam and the sixth light beam;
[0026] The fifth light b...
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The invention discloses a receiving and transmitting integrated inverse SAL (synthetic aperture ladar) system based on an acousto-optic frequency shifter. A laser beam emitted by a laser is split by a polarizing beam splitter, a first beam passes through a first cube-corner prism, a fiber bragg grating, a first beam splitter prism, a 1 / 4 wave plate, a first diaphragm and a telescopic system, is irradiated to a target and then reflected back to reach the first beam splitter prism and is reflected to a second beam splitter prism to be divided into two beams; a second beam passes through the acousto-optic frequency shifter, a second cube-corner prism and the second beam splitter prism and is divided into two beams; the two beams of the first beam and the two beams of the second beam pass through a second diaphragm, a third diaphragm, a polarization analyzer I, a photoelectric detector I, a polarization analyzer II and a photoelectric detector II respectively and two generated electric signals pass through a pre-amplifier, a frequency mixer and a signal processor for processing. The receiving and transmitting integrated inverse SAL system adopts receiving and transmitting integrated overall design, the signal to noise ratio is increased, and the resolution ratio is increased.
Description
technical field [0001] The invention relates to the field of photoelectric measurement system design, in particular to a transceiver-type integrated inverse synthetic aperture laser radar system based on an acousto-optic frequency shifter. Background technique [0002] High-resolution observation requires higher resolution, longer observation distance, and larger mapping bandwidth. Synthetic Aperture Ladar (SAL) has a high resolution for observing target facilities of interest. The research on SAL technology has been included in the national high-resolution observation development plan, and the resolution of SAL is a necessary supplement to the target observation means. [0003] However, the radar observation signal-to-noise ratio and resolution in the prior art are both low. Contents of the invention [0004] The object of the present invention is to address the deficiencies in the prior art, and provide a transceiver-type integrated inverse synthetic aperture laser rad...
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IPC IPC(8): G01S17/89
CPCG01S17/90
Inventor 曹长庆王香曾晓东冯喆珺潘泽威任杰陈渲麒
Owner XIDIAN UNIV