5G und die Wettervorhersagen (Allgemein)

e=mc2, Samstag, 03.09.2022, 22:57 (vor 921 Tagen) @ Alexander Lerchl

Ab Minute 06:30 erläutert sie, dass die Konzentration von Wasserdampf in der Atmosphäre von Satelliten bei 23.80 GHz ermittelt wird, und dass dies "bedenklich nah" am 5G NR Band n258 ist (24.25 - 27.50 GHz). Das sei zwar einige hundert MHz entfernt, aber die Frequenzbänder seien nicht so scharf begrenzt ("Leakage").

Das wurde vor 3 Jahren ziemlich hitzig debattiert und war Thema einer WRC Konferenz im Jahr 2019. Auf die Schnelle habe ich aber keine neue Information dazu gefunden. Ob das bedeutet, dass das Problem gelöst ist?

Eine konzise Zusammefassung aus Wikipedia:
The concerns prompted U.S. Secretary of Commerce Wilbur Ross and NASA Administrator Jim Bridenstine in February 2019 to urge the FCC to delay some spectrum auction proposals, which was rejected.[97] The chairs of the House Appropriations Committee and House Science Committee wrote separate letters to FCC chairman Ajit Pai asking for further review and consultation with NOAA, NASA, and DoD, and warning of harmful impacts to national security.[98] Acting NOAA director Neil Jacobs testified before the House Committee in May 2019 that 5G out-of-band emissions could produce a 30% reduction in weather forecast accuracy and that the resulting degradation in ECMWF model performance would have resulted in failure to predict the track and thus the impact of Superstorm Sandy in 2012. The United States Navy in March 2019 wrote a memorandum warning of deterioration and made technical suggestions to control band bleed-over limits, for testing and fielding, and for coordination of the wireless industry and regulators with weather forecasting organizations.[99]

At the 2019 quadrennial World Radiocommunication Conference (WRC), atmospheric scientists advocated for a strong buffer of −55 dBW, European regulators agreed on a recommendation of −42 dBW, and US regulators (the FCC) recommended a restriction of −20 dBW, which would permit signals 150 times stronger than the European proposal. The ITU decided on an intermediate −33 dBW until September 1, 2027, and after that a standard of −39 dBW.[100] This is closer to the European recommendation but even the delayed higher standard is much weaker than that pleaded for by atmospheric scientists, triggering warnings from the World Meteorological Organization (WMO) that the ITU standard, at 10 times less stringent than its recommendation, brings the "potential to significantly degrade the accuracy of data collected".[101] A representative of the American Meteorological Society (AMS) also warned of interference,[102] and the European Centre for Medium-Range Weather Forecasts (ECMWF), sternly warned, saying that society risks "history repeat[ing] itself" by ignoring atmospheric scientists' warnings (referencing global warming, monitoring of which could be imperiled).[103] In December 2019, a bipartisan request was sent from the US House Science Committee to the Government Accountability Office (GAO) to investigate why there is such a discrepancy between recommendations of US civilian and military science agencies and the regulator, the FCC.[104]