## Abstract

A program in FORTRAN 77 is designed to compute satellite orbit error due to geopotential model error. The program is self-contained and is based on an approximate analytical orbital theory that describes the radial, along-track and cross-track positional perturbations of a satellite in a near-circular orbit. Use of the approximate formula reduced programming effort in computing eccentricity functions and the transformation coefficients from Keplerian perturbations to radial, along-track and cross-track perturbations. With this program, the RMS orbit errors due to the EGM96 model error are estimated to be 0.56 m for ROCSAT-2, 64.09 m for COSMIC at a 400-km altitude, and 1.69 m for COSMIC at a 800-km altitude, respectively. The EGM96 model will yield an orbital accuracy consistent with the ground resolution of ROCSAT-2's optical camera, but will not yield the required sub-meter level orbital accuracy for COSMIC in the operational phase, which is for retrieving meteorological data.

Original language | English |
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Pages (from-to) | 357-367 |

Number of pages | 11 |

Journal | Computers and Geosciences |

Volume | 28 |

Issue number | 3 |

DOIs | |

State | Published - 1 Jan 2002 |

## Keywords

- Cosmic
- Geopotential model
- Linear perturbation
- Orbit error
- ROCSAT-2