Airborne laser radar beam pointing calibration method and system and laser spot detector

Abstract

The invention discloses an airborne laser radar beam pointing calibration method and system and a laser spot detector. The method comprises the following steps: step 1, arranging a laser spot detectorincluding a detector group and a detector group support frame in a scanning field of view of a laser radar; step 2, moving the detector group in a horizontal direction and / or a vertical direction, detecting the edge of a laser spot of the laser radar, and determining the central position of the laser spot; step 3, measuring space coordinates of the central position, and collecting laser measurement data of the laser radar for the central position; changing the position of the laser spot detector in a scanning field of view of the laser radar, and executing the steps 2-3 to enable the laser spot detector to detect different laser spots in the scanning field of view; and step 4, according to the space coordinates of the central position of the laser spot and the laser measurement data, calculating calibration parameters of the laser radar by using a laser radar beam pointing model, thereby realizing airborne laser radar beam pointing calibration.

Description

Technical field [0001] The invention relates to the beam pointing calibration of an airborne laser radar, in particular to a method, a system and a laser spot detector for the beam pointing calibration of an airborne laser radar. Background technique [0002] Airborne lidar is a remote, high-precision sensor that obtains geospatial information. The beam pointing accuracy is a key factor that affects the accuracy of the airborne lidar to obtain spatial information. Therefore, the lidar beam pointing must be accurately calibrated before leaving the factory. [0003] Airborne lidar calibration methods are divided into ground calibration and airborne calibration. Because airborne lidar mostly uses infrared bands other than visible light, the naked eye cannot identify the position of the laser spot. In ground calibration, the laser beam pointing and spot position are mostly detected by infrared detection films. ; When airborne flight calibration, by laying large-scale ground signs or mo...

AI Technical Summary

Problems solved by technology

Under the influence of long-distance or scattered light from the sun, it is difficult to identify and determine the position of the laser spot for ground calibration; therefore, if the airborne laser radar beam pointing calibration is performed at a too short distance, the beam pointing calibration accuracy cannot meet the requirements of the laser radar airborne operation. Require

The cost of airborne calibration is high, and the attitude measurement accuracy and laser spot position measurement accuracy directly affect the beam pointing calibration results

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