Initial Orbit Determination (IOD) methods have the following characteristics:

Initial Orbit Determination | |
---|---|

Property | Manifestation in IOD |

Input | Tracking measurements with tracking platform locations |

Output | Spacecraft position and velocity estimates |

A priori orbit estimate | Not required |

Output error magnitudes | Large |

Methods | Nonlinear, relatively trivial to implement |

Measurement editing during calculations | Not typically performed |

Sources | LaPlace, Gauss, Lagrange, Lambert, Gibbs, Herrick, Williams, Stumpp, Lancaster, Blanchard, Gooding, Smith |

Operationally, the orbit determination process is frequently begun, or restarted, with IOD.

ODTK 6.5