Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991tdar.nasa...69u&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 69-82 (SEE N94-29613 08-32)
Astronomy and Astrophysics
Astronomy
Deep Space Network, Galileo Spacecraft, Io, Jupiter (Planet), Radio Emission, Radio Telescopes, Telemetry, Very Large Array (Vla), Antenna Arrays, Electromagnetic Interference, Magellan Spacecraft (Nasa), Radio Astronomy
Scientific paper
Work is in progress to determine the feasibility of using the Very Large Array (VLA) radio telescope to receive telemetry from Galileo during its close encounter with Io on 7 Dec. 1995. The VLA was used previously to receive telemetry from Voyager 2 at Neptune. However, Jupiter's strong radio emission is an additional complication in the case of the Galileo encounter. This article analyzes the effect of Jupiter's radio emission on the phase-adjustment procedure ('autophasing') used to maintain coherence among the 27 VLA antennas. Results of an experiment designed to mimic the Io encounter are presented. As expected, Jupiter's strong radio emission has a considerable effect on the autophasing procedure. A simple emission model is found to give a good approximation to the fringe-visibility plots derived from the VLA data, and that successful model is used to estimate the VLA's ability to autophase on Galileo during the Io encounter. The effect of Jupiter should be small for projected baselines longer than approximately 800 m and completely negligible for projected baselines longer than approximately 1.1 km. The most extended configuration of the VLA (the A configuration) probably can be used successfully for telemetry reception during the Io encounter. Further analysis and testing of the effect of correlated noise from Jupiter is necessary before a final decision can be made about the feasibility of using the second largest (B) configuration of the VLA for reception of Galileo telemetry. Use of the B configuration could simplify the upgrades needed to support the Io encounter. Tests to help choose the preferred VLA configuration could be performed by using the VLA to observe the Magellan spacecraft at Venus during Jul. and Oct. 1991. Examination of the effects of planet noise on the VLA have implications beyond the use of that telescope for supporting the Io encounter. The effects of planet radio emission on spacecraft data received by antenna arrays are relevant to choosing the exact locations of antennas that might be built by the Deep Space Network in coming years.
No associations
LandOfFree
Phasing the Very Large Array on Galileo in the presence of Jupiter's strong radio emission does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Phasing the Very Large Array on Galileo in the presence of Jupiter's strong radio emission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phasing the Very Large Array on Galileo in the presence of Jupiter's strong radio emission will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1041294