Multi-element parallel scanning photon counting laser radar

Abstract

The invention discloses a multi-element parallel scanning photon counting laser radar which comprises a pulse laser, an optical transmitting system, a DOE element, an optical receiving system, an M * N optical fiber coupler, a narrow-band optical fiber filter, a PIN detector, a single photon detector, a TDC precision time measurement module and a digital signal processor. A transmitting end of the laser radar can be arranged in a far field to form array light beams with M * N light spots, a receiving end is matched with a transmitting light path, an M * N array single-photon detection mode is adopted, echo signals are detected, and then high-precision pulse time-of-flight distance measurement is carried out by a signal processing part. The mode of combining the array push broom scanning technology and the single photon detection technology is adopted, information of multiple target points in a scene can be obtained at the same time, the imaging range can be enlarged, and the maximum operating distance of the system is increased. The system is especially suitable for detecting a long-distance target, can effectively reduce the information acquisition time, and achieves the rapid imaging detection of the target.

Description

technical field [0001] The invention relates to the technical field of laser radar rapid imaging, in particular to a multivariate parallel scanning photon counting laser radar. Background technique [0002] Lidar is a combination of laser technology, computer technology, signal processing technology, etc. It has the advantages of high precision and high resolution when extracting information from the detected target. It is used in underwater detection, environmental monitoring and automatic driving. It is widely used in the field of precision measurement. When the target to be measured is far away from the detection system, due to the influence of atmospheric attenuation and scattering in the transmission of the laser echo, the signal reaching the receiving end is extremely weak, and it is not easy to excite the response of the detector. The detection and information extraction are the focus of current research. Most of the existing spaceborne and airborne lidar payloads m...

AI Technical Summary

Problems solved by technology

Most of the existing spaceborne and airborne lidar payloads use single-beam scanning, which usually requires a long scanning time to obtain the three-dimensional information of the target.

In addition, for the problem of weak echo signal power in long-distance detection, the traditional linear detection system can adopt the method of increasing laser emission power and receiving aperture, but in order to meet the requirements of light weight and reduce loss, the two are often not infinitely large Therefore, it is very important to improve the overall performance of the system while improving the detection sensitivity and imaging speed

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