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Many Federal agencies use radio frequency spectrum to perform vital operations. NTIA manages the Federal government's use of spectrum, ensuring that America's domestic and international spectrum needs are met while making efficient use of this limited resource. NTIA carries out this responsibility with assistance and advice from the Interdepartment Radio Advisory Committee and by:
In accordance with Section 1.106(f) of the Commission’s Rules, this letter seeks leave to file Technical Memorandum TM-20-536 on behalf of NTIA in order to supplement its pending Petition for Reconsideration or Clarification submitted on May 22, 2020.
This technical memorandum provides the results of a compatibility assessment between terrestrial GPS L1 coarse/acquisition (C/A) code receivers operating in the 1559-1610 MHz RNSS band and terrestrial operations in the 1526-1536 MHz, 1627.5 1637.5 MHz, and 1646.5-1656.5 MHz bands. The Interdepartment Radio Advisory Committee (IRAC) Technical Focus Group (TFG) assessed compatibility between different categories of GPS L1 C/A code receivers and the proposed terrestrial deployment by examining the degradation in carrier-to-noise density ratio (C/N0), loss-of-lock, position error, and increase in acquisition/reacquisition time for GPS receivers.
Keywords: electromagnetic compatibility (EMC); GPS; spectrum sharing; harmful interference; 1526-1536 MHz; 1627.5 1637.5 MHz; 1646.5-1656.5 MHz
This Technical Report provides details about protection of federal operations in the 5.850-5.925 GHz (5.9 GHz) band from new operations considered by the Federal Communications Commission (FCC) as part of the agency’s comprehensive review intended to allow for the highest and best use of the band. As part of its ongoing effort to accommodate new commercial wireless services, the National Telecommunications and Information Administration (NTIA) worked with agencies that operate federal systems in the band to determine the protections needed to permit new commercial services to operate without causing impact to incumbent operations. To facilitate the FCC’s expeditious review of the record, NTIA already submitted to the FCC a letter setting forth the relevant protection requirements derived from the numerous details provided in this Technical Report.