The DMA/GPS Earth Orientation Prediction Service
Abstract
Since mid-1984, the Defense Mapping Agency (DMA) has been computing predictions of pole position (x and y) and time difference (UT1-UTC = delta UT) to support the NAVSTAR/GPS orbit determination process. These predictions are based upon the 'derived Earth orientation parameters' published in the U.S. Naval Observatory's Earth Orientation Bulletin (Series 7) and are obtained by fitting these data to a set of models specified in the DMA/GPS Interface Control Document. This paper presents a review of the models and processes by which the Earth orientation predictions are computed at DMA. The results of a study to assess the accuracy of these predictions are also presented. Finally, several proposed methods for improving the prediction accuracies without altering the basic models are discussed and evaluated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 28, 1986
- Accession Number
- ADA166830
Entities
People
- John A. Bangert