Citation
Abstract
This article discusses ways in which failure can occur in reduced-order, orbitdetermination filter, error covariance calculations. In the context of this article, reduced-order filters denote nonoptimal filters which include fixed levels of uncertainty in some parameters of the measurement models or in the spacecraft dynamical model which are not explicitly estimated in the filter equations. Failure is defined herein as an increase in the orbit determination covariance with the addition of data or as an unreasonable growth in the covariance with time, Le., nonasymptotic behavior of the covariance. Some simple, known cases of failure are discussed along with their traditional remedies. In addition, more modern remedies are discussed which are currently under development at the Jet Propulsion Laboratory. The article first describes the known problems of reduced-order filters when they are employed for orbit determination, and their traditional remedies. Then, having defined these, the relevancy and desirability of the more modern remedies are made apparent.
Details
- Volume
- 42-114
- Published
- August 15, 1993
- Pages
- 34–42
- File Size
- 587.9 KB