QVLBI Doppler demonstrations conducted during Pioneer 2 encounter and solar conjunctions

Details QVLBI Doppler demonstrations conducted during Pioneer 2 encounter and solar conjunctions QVLBI Doppler demonstrations conducted during Pioneer 2 encounter and solar conjunctions

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976dsn..nasa...54c&link_type=abstract

In its The Deep Space Network p 54-66 (SEE N76-18163 09-12)

Physics

Deep Space Network, Doppler Navigation, Spacecraft Tracking, Trajectory Optimization, Differential Interferometry, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Polystation Doppler Tracking System

Scientific paper

During the Jupiter encounter of Pioneer 11 in December 1974, a limited amount of simultaneous two way and three way Doppler was obtained. It was demonstrated that, based on a very short arc of differenced Doppler (quasi very long baseline interferometry or QVLBI Doppler), the B-plane predictions were as good as 200 km at E-1 day and 400 km at E-3 days. During the two solar conjunctions of Pioneer 10 and 11, which occurred in March 1975, several passes of QVLBI Doppler were obtained and analyzed. The data quality of QVLBI Doppler was found to be two to three times better than the conventional two way Doppler when the sun-earth-probe angle was less than 5 degrees.

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