On-orbit geometric calibration method for spaceborne linear array multi-beam altimetry lidar

Abstract

An on-orbit geometric calibration method for a space-borne linear array multi-beam altimetry lidar, comprising: inputting initial calibration parameters into a space-borne linear array multi-beam altimetry lidar geometric model, and calculating the laser feet corresponding to each laser detection unit Print the initial coordinates; estimate the size and direction of the plane deviation of the laser footprint; determine the coordinates of the laser footprint control points corresponding to the initial coordinates of the laser footprint according to the initial coordinates of the laser footprint and the size and direction of the plane deviation of the laser footprint; use each laser The difference between the initial coordinates of the laser footprint corresponding to the detection unit and the coordinates of the control point of the laser footprint is used to calculate the ranging correction parameters of each laser detection unit; the overall position deviation of the laser footprint is calculated according to the coordinates of the control point of the laser footprint, and then The overall attitude correction parameters of the spaceborne linear array multi-beam altimetry lidar are obtained from the overall position deviation. This method can realize the on-orbit calibration of the ranging correction parameters and the overall attitude correction parameters of each laser detection unit of the spaceborne linear array multi-beam altimetry lidar.

Description

technical field [0001] The invention relates to the field of spaceborne laser radar detection, in particular to an on-orbit geometric calibration method of a spaceborne linear array multi-beam altimetry laser radar. Background technique [0002] In the development and testing process of altimetry lidar, the instrument generally has high pointing and ranging accuracy after ground calibration. However, due to factors such as vibration during satellite launch and changes in the space environment after orbiting, system parameters such as pointing and ranging of the altimetry lidar will change relative to the measured values ​​on the ground before launch, which will cause errors in the calculation of laser footprint coordinates. Therefore, in order to obtain high-precision spaceborne laser altimetry data, it is necessary to eliminate the systematic error of the altimetry laser radar through the on-orbit geometric calibration method. [0003] At present, the on-orbit geometric ca...

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Problems solved by technology

[0004] The on-orbit pointing calibration method of spaceborne laser based on pyramid search and terrain matching has been reported. This direction has a better effect on the on-orbit geometric calibration of spaceborne single-beam altimetry lidar. However, this method can only correct the spaceborne single-beam The pointing angle error of the altimetry lidar, without correcting the ranging error; this method is only applicable to the spaceborne single-beam altimetry lidar, not suitable for the spaceborne linear array multi-beam altimetry lidar

Each laser beam of the spaceborne linear array multi-beam altimetry lidar is equipped with independent unit detectors, and there is a problem of inconsistent ranging calibration parameters. After the payload is in orbit, the ranging parameters need to be calibrated for each detection unit

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