高精度地形星载激光测高仪在轨几何标定方法

doi:10.13474/j.cnki.11-2246.2024.0708

测绘通报 ›› 2024, Vol. 0 ›› Issue (7): 41-47.doi: 10.13474/j.cnki.11-2246.2024.0708

高精度地形星载激光测高仪在轨几何标定方法

张昊^1,2,3, 徐琪⁴, 黄佩琪⁴, 陈刚^2,3, 谢欢^4,5

1. 信息工程大学地理空间信息学院, 河南郑州 450000;
2. 地理信息工程国家重点实验室, 陕西西安 710000;
3. 西安测绘研究所, 陕西西安 710000;
4. 同济大学测绘与地理信息学院, 上海 200092;
5. 上海市航天测绘遥感与空间探测重点实验室, 上海 200092

收稿日期:2023-12-07 发布日期:2024-08-02
通讯作者: 陈刚。E-mail:splitter_ch@163.com
作者简介:张昊(1989—),男,助理研究员,主要从事雷达摄影测量、星载激光测高等方面工作。E-mail:isfetz@126.com
基金资助:
国家自然科学基金(42325106;42221002;42330112);地理信息工程国家重点实验室自主科研课题(SKLGIE2023-ZZ-4);上海市优秀学术带头人项目(23XD1404100);上海市科技创新行动计划高新技术领域项目(22511102900)

High-precision terrain-based on-orbit geometric calibration method for laser altimeter

ZHANG Hao^1,2,3, XU Qi⁴, HUANG Peiqi⁴, CHEN Gang^2,3, XIE Huan^4,5

1. Institute of Geospatial Information, Information Engineering University, Zhengzhou 450000, China;
2. State Key Laboratory of Geo-information Engineering, Xi'an 710000, China;
3. Xi'an Research Institute of Surveying and mapping, Xi'an 710000, China;
4. College of Surveying and Geo-informatics, Tongji University, Shanghai 200092, China;
5. Shanghai Key Laboratory for Planetary Mapping and Remote Sensing for Deep Space Exploration, Shanghai 200092, China

Received:2023-12-07 Published:2024-08-02

摘要/Abstract

摘要： 激光测高仪数字化标定方法由于标定频次高、人力物力消耗少等突出性优点越来越受到关注。本文提出了一种两步法的激光测高仪数字化标定方法,针对线性体制激光测高仪的几何定位模型,构建了关于翻滚角、俯仰角和测距系统误差的几何标定模型,并使用公开参考地形数据SRTM与高精度机载LiDAR点云进行了标定试验。与GF-14实际外场面探测器试验标定的数据比较分析。结果显示,本文提出的几何标定方法与地面探测器标定参数测角差异在0.5角秒以内,测距差异在0.2 m以内。通过独立数据验证标定结果的高程精度,本文提出的数字化标定方法和探测器标定方法的足印高程偏差表现出良好的一致性,两种方法标定所获取的足印高程与高精度机载点云高程的RMSE均优于0.3 m。本文方法在保证精度的同时,减少了人力物力的消耗,为星载激光测高仪在轨常态化标定提供了新的思路和方法。

关键词: 线性体制激光测高仪, 在轨几何标定, 数字化标定方法

Abstract: The digital calibration method for laser altimeters has attracted increasing attention due to its prominent advantages of high calibration frequency and low consumption of manpower and resources. This paper proposes a “two-step” digital calibration method for laser altimeters, focusing on the geometric positioning model of linear regime laser altimeters. A geometric calibration model concerning roll angle, pitch angle, and range system error is constructed, and calibration tests are conducted using publicly available reference terrain data SRTM and high-precision digital calibration fields. Comparing and analyzing with the actual field detector experimental calibration data of the GF-14. The results show that the geometric calibration method proposed in this paper has an angle difference within 0.5 arcseconds and a ranging difference within 0.2 m compared to the ground detector calibration parameters. By independently validating the elevation accuracy of the calibrated results, both the proposed digital calibration method and detector calibration method exhibit good consistency in footprint elevation bias. The RMSE between the footprint elevations obtained from both methods and the high-precision airborne LiDAR point cloud elevations is less than 0.3 m. The method proposed in this paper is not only ensures accuracy, but also reduces the consumption of human and material resources, providing a new approach and method for on-orbit normalization calibration of spaceborne laser altimeters.

Key words: linear system laser altimeter, in-orbit geometric calibration, digital calibration method

中图分类号:

张昊, 徐琪, 黄佩琪, 陈刚, 谢欢. 高精度地形星载激光测高仪在轨几何标定方法[J]. 测绘通报, 2024, 0(7): 41-47.

ZHANG Hao, XU Qi, HUANG Peiqi, CHEN Gang, XIE Huan. High-precision terrain-based on-orbit geometric calibration method for laser altimeter[J]. Bulletin of Surveying and Mapping, 2024, 0(7): 41-47.

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高精度地形星载激光测高仪在轨几何标定方法

High-precision terrain-based on-orbit geometric calibration method for laser altimeter

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