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X/ka celestial frame improvements: vision to reality
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Moll, V. E. Proctor, R. C. Sovers, O. J. Bagri, D. S. Tucker, B. C. Britcliffe, M. J. Lowe, S. T. Jacobs, C. S. Rogstad, S. P. Horiuchi, S. Wang, D. Soriano, M. A. Goodhart, C. E. Garcia-Miro, C. Franco, M. M. Clark, J. E. Skjerve, L. J. Navarro, R. Sigman, E. H. White, L. A. |
| Copyright Year | 2010 |
| Description | In order to extend the International Celestial Reference Frame from its S/X-band (2.3/8.4 GHz) basis to a complementary frame at X/Ka-band (8.4/32 GHz), we began in mid-2005 an ongoing series of X/Ka observations using NASA s Deep Space Network (DSN) radio telescopes. Over the course of 47 sessions, we have detected 351 extra-galactic radio sources covering the full 24 hours of right ascension and declinations down to -45 degrees. Angular source position accuracy is at the part-per-billion level. We developed an error budget which shows that the main errors arise from limited sensitivity, mismodeling of the troposphere, uncalibrated instrumental effects, and the lack of a southern baseline. Recent work has improved sensitivity by improving pointing calibrations and by increasing the data rate four-fold. Troposphere calibration has been demonstrated at the mm-level. Construction of instrumental phase calibrators and new digital baseband filtering electronics began in recent months. We will discuss the expected effect of these improvements on the X/Ka frame. |
| File Size | 1386919 |
| Page Count | 5 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110011829 |
| Archival Resource Key | ark:/13960/t9m37t34r |
| Language | English |
| Publisher Date | 2010-12-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Errors Deep Space Network Rates Per Time Ultrahigh Frequencies Celestial Reference Systems Radio Telescopes Spaceborne Telescopes Declination Extragalactic Radio Sources Position Errors Digital Filters Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
