The Determination of NAVSPASUR Phase Difference Errors
Abstract
This paper describes the methodology and results of a project to determine the magnitude and amplitude dependence of the errors inherent in the full-Doppler mode NAVSPASUR phase difference data. The purpose of this work was to generate an accurate model of these errors for subsequent use in simulation programs designed to predict the performance capabilities of both the current NAVSPASUR system and various proposed upgrades. We report here on the preliminary results obtained from an analysis of full-Doppler mode data collected by the NAVSPASUR system during one four hour period. The fundamental NAVSPASUR measured quantity is the received signal phase at each antenna array at a given receiver site. The raw phases from each of the n antenna arrays at a receiver site are combined to produce n-1 phase differences, each taken with respect to the designated reference antenna. The deployment of antenna arrays along each of two orthogonal directions, together with the use of antenna pairs (hereafter baselines) with different spatial separations (baseline lengths), allows for the simultaneous determination of two direction cosines (cos alpha, where alpha is the angle between the baseline vector and the satellite position vector in station coordinates) at each receiving site.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 16, 1988
- Accession Number
- ADA198859
Entities
People
- E. J. Wadiak
- Michael D. Andrews