Precision Spacecraft Tracking Using In-Beam Phase Referencing

Details Precision Spacecraft Tracking Using In-Beam Phase Referencing Precision Spacecraft Tracking Using In-Beam Phase Referencing

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aero.conf....1m&link_type=abstract

2008 IEEE Aerospace Conference. 1-8 March 2008, Big Sky, MT: 1-7

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Scientific paper

The deep space network (DSN) Array of the future provides an intriguing possibility of using the techniques of in-beam phase referencing to determine the angular position of spacecraft with accuracy at the level of 0.1 nano-radian (nrad). In this paper, we discuss the prospects for carrying out such measurements at both 8.4 GHz (X-band) and 32 GHz (Ka-band). Our study suggests that at X-band in-beam calibration may be available as an astrometric tool over 20-30 percent of the sky. The prospects at Ka-band, on the other hand, are not very hopeful. We point out that these estimates depend strongly on the number density of compact sources at the 1-mJy level. We also present the results from our recent VLBA (very long baseline array) observations at X-band, which has determined the compact source density at the 10-mJy level and discuss future observations to probe weaker source population. Finally, we discuss issues related to phase cycle ambiguity resolution and potential te!
chniques to resolve them.

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