| タイトル | A ground track control algorithm for the Topographic Mapping Laser Altimeter (TMLA) |
| 本文（外部サイト） | http://hdl.handle.net/2060/19930015518 |
| 著者（英） | Mcintosh, R.; Cooley, J.; Blaes, V.; Roszman, L. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1993-02-01 |
| 言語 | eng |
| 内容記述 | The results of an analysis of an algorithm that will provide autonomous onboard orbit control using orbits determined with Global Positioning System (GPS) data. The algorithm uses the GPS data to (1) compute the ground track error relative to a fixed longitude grid, and (2) determine the altitude adjustment required to correct the longitude error. A program was written on a personal computer (PC) to test the concept for numerous altitudes and values of solar flux using a simplified orbit model including only the J sub 2 zonal harmonic and simple orbit decay computations. The algorithm was then implemented in a precision orbit propagation program having a full range of perturbations. The analysis showed that, even with all perturbations (including actual time histories of solar flux variation), the algorithm could effectively control the spacecraft ground track and yield more than 99 percent Earth coverage in the time required to complete one coverage cycle on the fixed grid (220 to 230 days depending on altitude and overlap allowance). |
| NASA分類 | ASTRODYNAMICS |
| レポートNO | 93N24707 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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