[20200528]IF11558_频谱干扰问题：Ligado、L波段和GPS.pdf

https:/crsreports.congress.gov May 28, 2020Spectrum Interference Issues: Ligado, the L-Band, and GPSOn April 20, 2020, the Federal Communications Commission (FCC) unanimously approved a controversial application by Ligado Networks, a U.S. satellite communications company, to deploy a terrestrial nationwide network using L-Band radio spectrum. Ligados stated intent is to offer a combined satellite and terrestrial communications network that will enable other telecommunications carriers to deploy 5G services and provide wireless internet to support industrial networks. The Ligado case has triggered debate within the federal government about priorities for use of the radio spectrum and the framework in which spectrum decisions are made. Federal agencies including the Departments of Defense (DOD), Homeland Security, and Transportation and many members of the Armed Services committees in both Houses of Congress object to the FCCs decision. They argue that “loud” signals from Ligados high-power terrestrial transmitters will overpower “soft” signals from Global Positioning System (GPS) satellites operated by DOD, potentially disrupting military operations. GPS device manufacturers, the a