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Adaptive optics-based inverse synthetic aperture laser radar signal receiving system

A technology of inverse synthetic aperture and adaptive optics, which is applied in radio wave measurement systems, re-radiation of electromagnetic waves, utilization of re-radiation, etc., can solve problems such as wavefront error, influence on inverse synthetic aperture lidar, and reduce signal-to-noise ratio , to achieve the effect of ensuring the signal-to-noise ratio of the received signal

Active Publication Date: 2017-02-01
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, the problem faced by large-aperture astronomical telescopes is the wavefront error caused by atmospheric turbulence, which will seriously reduce the signal-to-noise ratio of the signal, and then affect the range resolution and azimuth resolution of the inverse synthetic aperture lidar.

Method used

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  • Adaptive optics-based inverse synthetic aperture laser radar signal receiving system
  • Adaptive optics-based inverse synthetic aperture laser radar signal receiving system
  • Adaptive optics-based inverse synthetic aperture laser radar signal receiving system

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, the inverse synthetic aperture lidar signal receiving system based on adaptive optics includes: lidar signal transmitting system 1, receiving telescope 2, high-speed tilting mirror 4, deformable mirror 5, beam shrinking system 6, target high-precision tracking sensor 8, Optical signal receiving detector 10 and target wavefront detector 12;

[0025] Such as figure 2 As shown, the signal emitted by the laser radar signal transmitting system 1 is a chirp signal with a center wavelength of 1064 nm, which is characterized in that the frequency of the signal changes continuously between pulses, and its advantage is that in a shorter pulse width, there Large frequency bandwidth can effectively improve the range resolution of the system;

[0026] The laser signal is diffusely reflected on the target surface, and pa...

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Abstract

The present invention discloses an adaptive optics-based inverse synthetic aperture laser radar signal receiving system. The system comprises a laser signal transmitting subsystem, a receiving telescope, a target wavefront detector, a target tracking sensor, a signal receiving system, a tilt control system, an aberration control system and so on; the target tracking sensor obtains the tilt information of a target relative to an optical axis and realizes real-time compensation for tilt through the tilt control system; and the target wavefront detector measures optical aberration caused by atmospheric turbulence and optical device error and carries out real-time compensation for the optical aberration through the aberration control system. With the adaptive optics-based inverse synthetic aperture laser radar signal receiving system of the invention adopted, the signal-to-noise ratio of echo signals received by an inverse synthetic aperture laser radar can be effectively improved, and the range resolution and azimuth resolution of the system can be improved.

Description

technical field [0001] The invention relates to an inverse synthetic aperture laser radar signal receiving system based on adaptive optics. The system uses adaptive optics to realize real-time detection and real-time compensation of optical aberrations caused by atmospheric turbulence and optical device errors, and effectively improves inverse synthesis. The signal-to-noise ratio of the echo signal received by the aperture lidar improves the range resolution and azimuth resolution of the system at the same time. Background technique [0002] Inverse synthetic aperture lidar technology is a technology that uses the relative motion of the lidar and the observed target to detect the same target by sending the same pulse multiple times, receives and processes the echo signal, and calculates the position of the target in the laser radar line of sight and relative motion direction. Active optical detection means to determine the projected image of the plane. Compared with the tra...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01S7/486
CPCG01S7/486G01S17/90
Inventor 付瀚初魏凯张雨东
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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