A Strategy for Active Remote Sensing Amid Increased Demand for Radio Spectrum (2015) / Chapter Skim
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Appendix C: Summary of the Radio-Frequency Interference Workshop
Appendix C: Summary of the Radio-Frequency Interference Workshop
Pages 218-229
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Radio-frequency interference has been increasingly observed in data recorded by several airborne and spaceborne radar remote sensing systems. The Academies established the Committee on a Survey of the Active Sensing Uses of the Radio Spectrum to study this problem.
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(by telecon) Masanobu Shimada, Japan Aerospace Exploration Agency (JAXA)
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Management of the spectrum by the national authorities is more reactive than pro-active, and pro-active management is urged. Silvestrin proceeded to describe the ESA active microwave sensor bands of inter est ranging from 0.435 GHz (P-band synthetic aperture radar (SAR)
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The tolerable interference to the Sentinel SAR would be exceeded by 30 dB, and even a single outdoor wireless RLAN would be detectable. He noted that the Sentinel design stemmed from 10 years of effort, while the request to use the new subband for RLAN arose only over the previ ous year.
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RCM launches are scheduled to begin in 2018. PERSPECTIVES FROM THE JAPAN AEROSPACE EXPLORATION AGENCY Masanobu Shimada of JAXA provided an assessment of RFI concerns to the JAXA L-band SAR missions, including ERS-1/SAR (1992-1998)
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Major increases in contaminated areas are observed from JERS-1 to PALSAR, although differences in radar bandwidth and power level would warrant a major reprocess ing effort to ensure consistency between the two data sets. FREQUENCY ALLOCATION CHALLENGES FROM UWB RADARS Frequency Allocation Challenges from ultra wideband (UWB)
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Significant loss of resolu tion occurs for current notching requirements. Bridging notched frequencies can improve resolution, as can use of cognitive radar techniques.
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JPL RADAR RFI EXPERIENCE WITH ATMOSPHERIC RADARS Steve Durden of NASA JPL provided a synopsis of airborne and satellite atmospheric radar missions. The ARMAR radar operated at 13.4 GHz, and later (APR-2)
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. JPL PERSPECTIVES ON L-BAND RADAR INTERFERENCE Mike Spencer of NASA JPL provided a discussion of the impact of RFI on L-band active remote sensing.
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JPL PERSPECTIVES ON SCIENCE DEGRADATION METRICS TO TRACK THE IMPACT OF AN EVOLVING RFI ENVIRONMENT Scott Hensley of NASA JPL provided a discussion of metrics to track the impact of an evolving RFI environment and observations of increasing RFI over the past decades of active science studies. A goal is that NASA develop a standard way of setting RFI criteria.
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An early RFI study led to a requirement for mandatory notching of all users within a 20 nmi zone from nadir to prevent communications disruption. However, the Air Force Spectrum Management Office (AFSMO)
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2. The development of a common set of standardized metrics connecting RFI levels to science product accuracies would be useful in assessing the costs of observing with increasing levels of RFI.
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