In EESS radiometer systems, RFI levels are cumulative. Therefore, impacts from adjacent signals described by Piepmeier and Pellerano,4 coupled with the additional impacts from spurious and OOB emissions in the above analysis, suggest that a single ARSR-type radar operating in full compliance with FCC §27.53 can impact the operation of EESS radiometers operating in the 1.4 GHz protected region.

This analysis has assumed that the OOB emissions from the radar are at the maximum allowable level (−43 dBW/MHz) throughout the entire 27 MHz radiometer bandwidth; that the radar transmits its peak power over its pulse width, which lies entirely within the radiometer integration period; and that the antennas are oriented so that 15 dB below maximum antenna coupling occurs.

4

J.R. Piepmeier and F.A. Pellerano, “Mitigation of Terrestrial Radar Interference in L-Band Spaceborne Microwave Radiometers,” in Proceedings of the 2006 International Geoscience and Remote Sensing Symposium (IGARSS), Denver, Colorado, 2006, pp. 2292-2296, DOI 10.1109/IGARSS.2006.593.



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