Miniature interferometer terminals for earth surveying
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A system of miniature radio interferometer terminals is proposed for the measurement of vector baselines with uncertainties ranging from the millimeter to the centimeter level for baseline lengths ranging, respectively, from a few to a few hundred kilometers. Each terminal would have no moving parts, could be packaged in a volume of less than 0.1 m3, and could operate unattended. These units would receive radio signals from low-power (<10 w) transmitters on Earth-orbiting satellites. The baselines between units could be determined virtually instantaneously and monitored continuously as long as at least four satellites were visible simultaneously. Acquisition of the satellite signals by each terminal would require about one minute, but less than a second of signal integration, and the collection of only a few kilobits of data from two receiving units would suffice to determine a baseline. Different baseline lengths, weather conditions, and desired accuracies would, in general, dictate different integration times.
KeywordsGlobal Position System Elevation Angle Intermediate Frequency Global Position System Satellite Satellite Signal
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- 2.D.S. ROBERTSON,et al.: Recent Results of Radio Interferometric Determinations of a Transcontinental Baseline, Polar Motion, and Earth Rotation, in Proc. of IAU Symposium No. 82, (in press), 1978.Google Scholar
- 5.B.W. PARKINSON: “NAVSTAR Global Positioning Systems (GPS)”, presented at the 1976 National Telecommunications Conference in Dallas, Texas (I.E.E.E. Catalog Number 76 CH 1149-4 CSCB).Google Scholar
- 6.International Telecommunications Union, “Radio Regulations” (International Telecommunications Union, Geneva, 1968).Google Scholar
- 7.A.E.E. ROGERS:Proc. I.E.E.E., 59, 1617, 1971.Google Scholar
- 8.C.C. COUNSELMAN, and H. HINTEREGGER:Proc. I.E.E.E., 61, 478, 1973.Google Scholar
- 12.C.W. MURRAY, and J.W. MARINI: GSFC Technical Memorandum, 1976.Google Scholar
- 13.B. ELSMORE, and M. RYLE:Mon. Not. Roy. Astron. Soc., 174, 411, 1976.Google Scholar
- 14.L.W. SCHAPER,et al.:Proc. I.E.E.E., 58, 272, 1970.Google Scholar
- 15.J.M. MORAN, and H. PENFIELD: Final Report, Contract NASS-20975, 1976.Google Scholar
- 16.P.F. MacDORAN: Presented at the International Symposium on the Use of Artificial Satellites for Geodesy and Geodynamics, Lagonissi, Greece, 29 May–6 June 1978.Google Scholar