On-Line Parameter Updating for Mars Stratosphere and Troposphere Using Minimal Measurements,
Abstract
A technique is developed for on-board computation of the Mars atmospheric parameters ahead of an entry vehicle based upon discrete measurements of density and temperature gradient utilizing a maximum likelihood sequential estimation scheme. An atmospheric model suitable for describing both adiabatic and isothermal atmospheric regions has been derived. A rapid estimation scheme is introduced which permits a rapid reevaluation of the covariance matrix of the atmospheric parameters when passing through a changing atmospheric environment. A parameter transition detection scheme is developed which is suitable for determining a region of atmospheric alteration which cannot be known prior to atmospheric entry. A digital computer evaluation demonstrates the rapid estimation scheme is clearly superior to standard Kalman filtering throughout both the stratosphere and troposphere.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0717108
Entities
People
- C. N. Shen
- J. C. Duke
Organizations
- Rensselaer Polytechnic Institute