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Proceedings Paper

Geodynamics Applications Of Spaceborne Laser Ranging
Author(s): Steven C. Cohen; John J. Degnan
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Paper Abstract

The Geodynamics Laser Ranging System (GLRS) is a spaceborne laser ranging instrument being developed by NASA as a facility instrument for the Earth Observing System (Eos). GLRS is to be used to study regional and local scale crustal movements. As such, it is designed to make highly precise range measurements to retroreflector targets located in geophysically interesting sites. Using a two color ranging scheme, absolute range accuracies of several millimeters are expected. Simulations based on this accuracy and the Eos orbital parameters show that length of the intersite baseline between retroreflectors can be determined to several millimeters accuracy at distances from a few kilometers to several hundred kilometers with several passes of GLRS range data collected over a few day interval. Short arc techniques are used to minimize the effects of gravity field and other force model uncertainties. Relative heights can be determined to subcentimeter accuracy over comparable distances. The accuracy depends, in part, on the retroreflector locations relative to the orbital path, the number of laser shots used, and the viewing angles from the spacecraft. GLRS is also intended as a high precision laser altimeter with an intrinsic vertical accuracy of 10 cm and a horizontal resolution of about 70 meters. The altimetric function can be used to monitor the topography and roughness of ice sheets and land surfaces. With coarser vertical resolution it can also profile cloud-top heights. This paper describes the scientific objectives of the GLRS geodynamics measurements, and presents the results of recent simulations which assess the accuracy of the instrument in determining intersite baseline lengths and relative heights.

Paper Details

Date Published: 25 July 1989
PDF: 9 pages
Proc. SPIE 1062, Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing, (25 July 1989); doi: 10.1117/12.951874
Show Author Affiliations
Steven C. Cohen, NASA/Goddard Space Flight Center (United States)
John J. Degnan, NASA/Goddard Space Flight Center (United States)

Published in SPIE Proceedings Vol. 1062:
Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing
Martin M. Sokoloski, Editor(s)

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