Satellite Trajectory Determination and their Expected Errors OGO-IV, GEOS-I
Precision trajectory determination, as needed for some of NASA’s spacecraft, requires a close analysis of the errors of the state vector. Particularly important is the determination and separation of the errors caused by the tracking systems from those caused by the trajectory determination process. Only a very good understanding of this effect will lead to the required decrease of trajectory errors.
In this paper, orbits from GEOS-A and OGO spacecraft are analyzed and their trajectory errors estimated using our precision Definitive Orbit Determination System. Then, a tracking systems error study is performed to determine those errors of the state vector which are due only to the tracking systems. From these it is concluded that the major contribution to the total errors in the state is due to the uncertainties in the trajectory analysis geopotential, integration procedures, etc.) rather than from the errors of our present worldwide distributed tracking stations . Therefore, future work to improve our orbit determination capability will be directed to improve our software capability.
KeywordsTracking System Orbit Determination Error Theory Tracking Station Trajectory Error
Unable to display preview. Download preview PDF.
- 1.Siry, J. W., Stewart, D. J.: Goddard Orbit Information, GSFC X-550-69-136, February 1969.Google Scholar
- 2.Vonbun, F. O., Kahn, W. D.: Tracking Systems, Their Mathematical Models and Their Errors, Part I — Theory. NASA TN D-1471, October 1962.Google Scholar
- 3.Kahn, W. D., Vonbun, F. O.: Tracking Systems, Their Mathematical Models and Their Errors, Part II — Least Squares Treatment. NASA TN D-3776, December 1966.Google Scholar
- 4.Schmid, S. F.: Users Manual, Mark II Error Propagation Program. NASA Contract No. NAS5-9700, Philco. Palo Alto, California, February 15, 1966.Google Scholar
- 5.Bonavito, N. L.: An Analysis of Satellite Position Uncertainty by Statistical Mechanics, GSFC X-552-68-465, December 1968.Google Scholar
- 7.MSC/GSFC: Apollo Mission and Navigation Systems Characteristics, NASA ANGW Report, AN-1.3, December 15, 1967.Google Scholar
- 8.Cooley, J. L., Marlow, A.: Orbital Error Studies — Tracking from a Synchronous Spacecraft, GSFC X-551-67-7, January 1969.Google Scholar
- 9.Schroeder, C. A.: Electronic Interferometer Tracking, 5th National Symposium on Space Electronics and Telemetry, September 19-21, 1966, Washington, D.C.Google Scholar
- 10.Kruger, B.: The Range Rate Error Due to the Averaging Techniques of Doppler Measurements. GSFC X-513-65-100, March 5, 1965.Google Scholar
- 11.Manned Spacecraft Center/Goddard Space Flight Center, Apollo Navigation Ground and Onboard Capabilities, ANWG Technical Report AN-2.1, September 1, 1966.Google Scholar
- 12.Krtjger, B.: Effects of Correlated Noise with Applications to Apollo Tracking Problems, NASA TN D-4121, February 1968.Google Scholar
- 13.Marsh, J. G., et al.: Intercomparison of the Minitrack and Optical Tracking Networks Using GEOS-I Long Arc Orbital Solutions, Part I, GSFC X-552-68-105, December 1967. — Schmid, P. E.: Atmospheric Tracking Errors at S-and C-Band Frequencies, GSFX X-507-65-398, October 5, 1968.Google Scholar
- 14.Wolf Research: Coordinate and Time Reference Systems Used in Astrody-namics, NASA Contract No. NAS5-9756-124, September 1968.Google Scholar
- 15.Schmid, S. F.: Application of State-Space Methods to Navigation Problems, in: Advances in Control Systems, Vol. 3. New York, London: Academic Press 1966.Google Scholar