测绘学报 ›› 2021, Vol. 50 ›› Issue (9): 1240-1250.doi: 10.11947/j.AGCS.2021.20200466

• 摄影测量学与遥感 • 上一篇    下一篇

全波形星载激光测距误差抑制的滑动窗口高斯拟合算法

谢俊峰1,2, 刘仁1,2   

  1. 1. 自然资源部国土卫星遥感应用中心, 北京 100048;
    2. 河海大学地球科学与工程学院, 江苏 南京 211100
  • 收稿日期:2020-09-25 修回日期:2021-06-03 发布日期:2021-10-09
  • 通讯作者: 刘仁 E-mail:rs_liur@163.com
  • 作者简介:谢俊峰(1981-),男,博士,研究员,研究方向为星载激光测高仪几何检校与数据处理、卫星定姿。E-mail:junfeng_xie@163.com
  • 基金资助:
    科技部重点研发计划(2020YFE0200800);高分测绘应用示范项目二期(42-Y30B04-9001-19/21);国家自然科学基金(41971426;41771360;41571440);国防科技工业局科学预先研究项目(D040105;D040106);自然资源部青年创新人才计划(12110600000018003930)

Sliding window Gaussian fitting algorithm for ranging error suppression of full-waveform spaceborne laser

XIE Junfeng1,2, LIU Ren1,2   

  1. 1. Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China;
    2. School of earth sciences and engineering, Hohai university, Nanjing 211100, China
  • Received:2020-09-25 Revised:2021-06-03 Published:2021-10-09
  • Supported by:
    The Key Research and Development Program of Ministry of Science and Technology (No. 2020YFE0200800); The High-resolution Surveying and Mapping Application Project (No. 42-Y30B04-9001-19/21); The National Natural Science Foundation of China (Nos. 41971426; 41771360; 41571440); The Science Advance Research Project of National Defense Science, Technology, and Industry Bureau (Nos. D040105; D040106); The Innovative Youth Talents Program, MNR (No. 12110600000018003930)

摘要: 星载激光测距精度是影响激光测高仪几何检校与处理精度的主要来源之一。针对由全波形星载激光模拟信号经数字化处理后的量化误差带来的激光测距提取精度不高、稳定性低的问题,本文提出一种全波形星载激光测距误差抑制的滑动窗口高斯拟合算法。该方法利用滑动窗口剔除波峰附近似噪声点,并基于高斯曲线拟合优化波形峰值,从而精化激光测距值。然后以高分七号国产星载激光测高仪为试验对象,利用冰面、内陆湖面和平坦陆地地表进行激光高程相对和绝对精度对比验证。结果表明,相对于一般峰值方法,本文算法使得激光测距精度提升了7.5 cm;基于本文方法提取的测距值,计算的激光高程相对精度提升4.2 cm;利用机载LiDAR点云数据验证,高程绝对精度提升了4.5 cm;充分说明本文方法可作为有效减少星载激光测距随机误差的一种方法,为高分七号卫星亚米级高程测量精度处理提供了不可或缺的基础。

关键词: 星载全波形激光, 测距精度, 一般峰值法, 滑动窗口, 相对精度, 绝对精度

Abstract: The ranging accuracy of spaceborne laser altimeter is one of the main sources that affect the geometric calibration and processing accuracy of the laser.Aiming at the issues of laser ranging extraction lower accuracy and the stability, caused by the quantization error of the full-waveform spaceborne laser analog signal after digital processing, so a sliding window Gaussian fitting algorithm for ranging error suppression of full-waveform spaceborne laser is proposed.This method uses a sliding window to eliminate noise points near the peak, and optimizes the peak value of the waveform to extract a more accurate ranging value.Finally, the GF-7 laser altimeter was used as the test object, the relative and absolute accuracy of laser elevation were compared and verified by using the ice surface, inland lake and the flat ground.The results indicate that, the laser ranging accuracy of the paper algorithm is improved by 7.5 cm compared with the general peak method. Based on the ranging value of the paper method, the relative accuracy of laser elevation is improved by 4.3 cm. The absolute accuracy of laser elevation is increased by 4.5 cm verified by airborne LiDAR point cloud data. Which fully shows that the method in this paper can be used as a method to reduce effectively the random error of laser ranging, and provides an indispensable foundation for the sub-meter elevation measurement accuracy of the GF-7 satellite.

Key words: full-waveform spaceborne laser, ranging accuracy, waveform peak method, sliding window, relative accuracy, absolute accuracy

中图分类号: