Initial Orbit Determination

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