3. Ground system for the RIS experiment

The ground system consists of an optical satellite tracking system and a laser transmitter/receiver system for the spectroscopic measurement. Figure 3-1 illustrates the ground system. An active satellite tracking method using the image of RIS lit by a second-harmonics Nd:YAG laser was used simultaneously with the programmed tracking method, to achieve the tracking accuracy required for the experiments. Two single-longitudinal-mode TEA-CO2 lasers were used for the spectroscopic measurements. One of the TEA laser was used to measure absorption of atmospheric trace gases, and the other is used to record a reference signal. The method using the Doppler shift of reflected beam caused by the satellite movement is used in the RIS experiment to measure spectrum of the atmosphere. Figure 3-2(a) shows a photograph of the tracking telescope with a 1.5-m diameter at the Communications Research Laboratory, and Fig. 3-2 (b) shows the laser transmitter-receiver system.


Fig. 3-1 The laser transmitter-receiver system.



Fig. 3-2 Photograph of satellite tracking telescope (left)
and the laser transmitter-receiver system (right).


4. Results - Active tracking using image of the RIS
5. Results - Optical characteristics of the RIS
6. Results - Spectrum Measurement with the RIS
7. Results - Orbital Determination of ADEOS by laser ranging to the RIS
8. Future perspective
9. Publications

1. Outline of the RIS Experiment
2. The RIS on the ADEOS

Return to RIS home page