Pathfinder - A technique for improving the targeting accuracy of Giotto

Details Pathfinder - A technique for improving the targeting accuracy of Giotto Pathfinder - A technique for improving the targeting accuracy of Giotto

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984adans..54.1243c&link_type=abstract

IN: Astrodynamics 1983; Proceedings of the Conference, Lake Placid, NY, August 22-25, 1983. Part 2 (A84-30526 13-13). San Diego,

Astronomy and Astrophysics

Astronomy

Ephemerides, Flyby Missions, Halley'S Comet, Optical Tracking, Orbital Elements, Space Navigation, Covariance, Data Transmission, European Space Agency, Giotto Mission, International Cooperation, Satellite Transmission, Soviet Spacecraft, Vega Project, Very Long Base Interferometry

Scientific paper

A 'pathfinder' plan to improve Halley's Comet targeting accuracy of ESA's Giotto spacecraft is proposed, by which optical data and orbit information from Soviet VEGA spacecraft are used to produce an updated ephemeris for Halley's Comet. Two versions of the plan are described and the increased targeting accuracy is determined through a linear covariance analysis. In both versions of the plan, NASA Deep Space Net VLBI measurements of VEGA position are exchanged for information from VEGA about its optical pointing angle and Doppler and ranging measurements which are then transmitted to Giotto. In the covariance analysis of targeting accuracy, it is found that by using pathfinder the error in Giotto-Halley targeting can be reduced from 500 to within 100 km. It is predicted that pathfinder will thus substantially improve the amount of data that Giotto will gather from its fly-by of Halley's Comet March 14, 1986.

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