An all-weather lidar detection system and method based on photon intensity correlation

Abstract

The invention discloses an all-weather laser radar detection system and method based on photon intensity correlation. The system includes: a transmitting end, a receiving end, a local photoelectric detector, a signal processing unit, and a three-dimensional measuring unit; the transmitting end is used to generate a pulsed laser beam Split the beam to obtain the transmitted laser and reflected laser; the local photodetector is used to convert the reflected laser into an electrical signal as a reference electrical signal; the receiving end is used to receive several detection signals reflected by the detection target and convert them into electrical pulse signals; The signal processing unit obtains the horizontal delay time and the vertical delay time based on the reference electrical signal and the photon arrival time sequence of each electrical pulse signal; the three-dimensional measurement unit is used to obtain the three-dimensional position and three-dimensional Construct the image and complete the lidar detection. The invention can be applied to the all-weather high-precision detection of the laser radar under extreme weather conditions such as rain, fog, cloud and haze.

Description

technical field [0001] The invention relates to the technical field of laser remote sensing application, in particular to an all-weather lidar detection system and method based on photon intensity correlation. Background technology [0002] Lidar has the advantages of high measurement accuracy, strong anti electromagnetic interference ability and good orientation. In recent years, lidar has played an increasingly important role in the fields of national economy and military defense, such as unmanned driving, vehicle sensing, laser communication, remote sensing imaging, positioning guidance and aerospace. However, when the laser signal is transmitted in the atmosphere, aerosol particles such as rain, fog, dust haze, cloud and snow in the atmosphere and atmospheric turbulence interact with the laser, which will produce linear and nonlinear effects such as scattering, absorption, broadening and drift, reduce the laser power at the receiving end and change the spot profile, resulting...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an all-weather laser radar detection system and method based on photon intensity correlation, to solve the technical problems in the prior art, and to use the two-photon intensity correlation characteristic to greatly reduce the interference of optical path difference on target detection accuracy , so that the image quality of lidar is not affected by bad weather and low light conditions, and can be applied to all-weather high-precision detection of vehicle-mounted and airborne lidar under extreme weather conditions such as rain, fog, cloud and haze

Images