Radio Frequency Compatibility of VLBI, SLR, and DORIS at GGOS Stations

Details Radio Frequency Compatibility of VLBI, SLR, and DORIS at GGOS Stations Radio Frequency Compatibility of VLBI, SLR, and DORIS at GGOS Stations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.g11b0638b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #G11B-0638

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[1294] Geodesy And Gravity / Instruments And Techniques, [1295] Geodesy And Gravity / Integrations Of Techniques

Scientific paper

Radio frequency compatibility must be carefully considered when co-locating VLBI, SLR, and DORIS instruments at a GGOS station. The next-generation VLBI2010 sensor, which will possess a broadband (2-14 GHz), low-noise microwave receiver, is susceptible to having its sensitivity degraded by nearby transmitters both at the frequency of the transmitted signal and at other frequencies as well. Of particular concern for VLBI at a GGOS site are the DORIS beacon, which transmits continuously at 2 GHz, and the high-power X-band aircraft surveillance radar associated with many SLR systems. Specifications must be developed by which VLBI, SLR, and DORIS may be co-located and function with minimal impact on each other. In this contribution, we discuss the maximum permissible strength of an interfering signal in a VLBI2010 system and compare it with the expected worst-case levels from DORIS and SLR radar. We demonstrate the potential for overdriving a VLBI2010 receiver using measured power levels from the DORIS and SLR radar transmitters at the Goddard Geophysical Astronomical Observatory, which is the first site in the NASA network to incorporate all three techniques. Finally, we present potential solutions that ensure acceptably low interference levels for VLBI2010 while minimizing the impact on operations for all three techniques.

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