AN ACCURACY STUDY OF THE INITIAL CONDITIONS GENERATOR USING VERLORT DATA
PHILCO CORP PALO ALTO CA
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The propagation errors of the initial condition generator are studied in two ways 1 by comparing observational data on one pass with predictions from initial conditions generated on a previous pass of the same satellite, and 2 by statistically comparing the elements generated by different passes of the satellite. These two methods are found to agree. Excluding one set of poor data, it is found that the propagation error has a position standard deviation of about ten nautical miles perpendicular to the orbit plane, and of about fifty nautical miles in this plane. The period error is found to have a standard deviation of about seventy-five to one hundred seconds. A means of reacquiring the satellite on the basis of this analysis is presented and linearized equations for the antenna program are listed.
- Spacecraft Trajectories and Reentry