Direct recovery of mean gravity anomalies from satellite to satellite tracking
Abstract
The direct recovery was investigated of mean gravity anomalies from summed range rate observations, the signal path being ground station to a geosynchronous relay satellite to a close satellite significantly perturbed by the short wave features of the earth's gravitational field. To ensure realistic observations, these were simulated with the nominal orbital elements for the relay satellite corresponding to ATS6, and for two different close satellites (one at about 250 km height, and the other at about 900 km height) corresponding to the nominal values for GEOSC. The earth's gravitational field was represented by a reference set of potential coefficients up to degree and order 12, considered as known values, and by residual gravity anomalies obtained by subtracting the anomalies, implied by the potential coefficients, from their terrestrial estimates. It was found that gravity anomalies could be recovered from strong signal without using any apriori terrestrial information, i.e. considering their initial values as zero and also assigning them a zero weight matrix. While recovering them from weak signal, it was necessary to use the apriori estimate of the standard deviation of the anomalies to form their apriori diagonal weight matrix.
 Publication:

Unknown
 Pub Date:
 December 1974
 Bibcode:
 1974drmg.rept.....H
 Keywords:

 Gravity Anomalies;
 Relay Satellites;
 Satellite Tracking;
 Ats 6;
 Data Acquisition;
 Geos 3 Satellite;
 Gravitational Fields;
 Mathematical Models;
 Signal Processing;
 Geophysics