Accuracy Estimates of 1 deg x 1 deg Mean Anomaly Determinations from a High-Low SST Mission.
OHIO STATE UNIV COLUMBUS DEPT OF GEODETIC SCIENCE
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The method of least squares collocation is used to estimate the accuracy and correlation of 1 degree x 1 degree anomalies that could be determined from a high-low satellite to satellite tracking mission. The observed data is taken to be the line of sight acceleration which can be computed from the range rate data. Variables considered in this study were a the spherical distance from the center of the 1 deg x 1 degree block within which data is selected for use b the accuracy of the observed accelerations c the height of the low satellite and d the data density or interval. Typical results indicate the at a low satellite height of 200 km, a data noise corresponding to a range accuracy of or - 0.015 cmsec, would yield a 1 degree x 1 degree anomaly to an accuracy of about or - 8 mgals with an average error correlation coefficient between adjacent blocks of -0.6. Lowering the satellite to 150 km reduces the accuracy to about or - 5 mgals but increases the correlaton to about -0.9. This study does not consider the effects of orbit error, nor errors in the degree 12 reference field. In addition, some results could not be obtained when stable matrix inversions could not be obtained. This occured when dense data andor low data noise was being used. Author
- Spacecraft Trajectories and Reentry