Two-axis pointing mechanism for Earth observation system using heterodyne interferometry positioning sensor

Naozumi Tsuda; Katsutoshi Shimizu

doi:10.1117/12.328540

29 October 1998 Two-axis pointing mechanism for Earth observation system using heterodyne interferometry positioning sensor

Naozumi Tsuda, Katsutoshi Shimizu

Author Affiliations +

Proceedings Volume 3429, Current Developments in Optical Design and Engineering VII; (1998) https://doi.org/10.1117/12.328540
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The 2-Axis pointing mechanism which we developed is designed for earth observation system. This pointing mechanism is expected to work on the geostationary orbit with high resolution compare with former one. To achieve high resolution, we adopted optical heterodyne technique to mirror angle detecting sensor instead of rotary encoder. The angle of the mirror is calculated from the distance between mirror base and a certain point of reverse side of the mirror. We can get the resolution of 0.029 (mu) rad. For mirror driving mechanism, we adopted a crank mechanism because a pointing mechanism working on the geostationary orbit is not necessary to rotate whole angle. We can get about 1:10 reduction ratio with a crank mechanism in addition to the reduction gear attached to the motor shaft. We have made experimental model and validated its performance.

Citation Download Citation

Naozumi Tsuda and Katsutoshi Shimizu "Two-axis pointing mechanism for Earth observation system using heterodyne interferometry positioning sensor", Proc. SPIE 3429, Current Developments in Optical Design and Engineering VII, (29 October 1998); https://doi.org/10.1117/12.328540

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