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Atmospheric Correction and Multiwavelength Ranging Session Summary

V. Luceri and S. Riepl

Title of Paper Principal Author
Two-Wavelength Satellite Laser Ranging Experiment at Shanghai Observatory Z. Zhongping
Real-Time Separation Atmospheric Tip-Tilt Signal from Lunar Surface X. Yaoheng
Effects of the Atmosphere on the SLR Precision J. Mulacova
Atmospheric Contribution to the Laser Ranging Jitter L. Kral
The Correction of SLR Data by the Nonlinear Dispersion of the Refraction Index of the Air Y. Galkin
Multiwavelength Refraction Modeling Improvements for SLR Observations G. Hulley

The session on atmospheric correction and multi wavelength ranging started with a contribution concerning the dual wavelength Raman approach at Shanghai observatory, which reported successful acquisition of LEO satellites in two colour mode: experiment started on July 2003 and more than 20 passes tracked. New plans include the acquisition of a new counter and the improvement of the Raman output energy.

The second presentation dealt with an adaptive optics experiment carried out at Yunnan Observatory. It aims at the improvement of the LLR link budget by deriving a tip tilt correction signal from lunar surface images, gathered in real time, in order to drive a compensating mirror which improves the effective transmit laser pointing stability.

Two contributions were related to the turbulence induced ranging jitter. Taking advantage of the Graz 2 kHz laser ranging facility, experiments employing a variety of ground and spaceborne targets have been carried out. Main goals were the modelling of the atmospheric turbulence and the measure of its influence on the ranges. In parallel seeing measurements were taken in order to reveal possible correlations between atmospheric conditions and turbulence-induced ranging jitter .

The session was closed by a poster presentation related to the atmospheric refraction modelling which indicated the necessity to improve both the spatial sampling resolution of atmospheric data and the spectral sampling resolution of refractivity measurements, for a better understanding of the group velocity concept applied in SLR.

 

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Last Updated: September 8, 2004