Satellite Constellations Face Spectrum Interference Challenges

The increasing number of satellite constellations is creating a spectrum crunch, raising concerns about interference with critical weather forecasting instruments. NOAA's Jordan Gerth emphasizes the importance of quantifying interference through observing system experiments to inform discussions with the National Telecommunications and Information Administration and regulators. The potential for broadband communications to disrupt microwave sounders on weather satellites is a significant threat to accurate weather prediction.

NASA's experience with the Soil Moisture Active Passive (SMAP) satellite, which employs RFI detection and mitigation algorithms, highlights the growing prevalence of radio frequency interference. The FCC's proposal to increase use of the Upper Microwave Flexible Use Service (UMFUS) bands is a particular point of contention, with meteorologists worried about the impact on the Advanced Technology Microwave Sounder on the Joint Polar Satellite System.

Resolving these spectrum conflicts requires a collaborative approach, balancing the needs of the expanding satellite communications industry with the imperative of maintaining reliable weather forecasting capabilities. Failure to do so could have serious consequences for public safety and economic stability.

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