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The FAA is planning to have complete coverage of the CONUS with VORs with their Minimum Operational Network (MON): * https://bruceair.wordpress.com/tag/minimum

• labcomputer 6y ago
  They are (were?) doing some research around using a network of DME stations. The research was mostly about how to improve the accuracy of TOF measurements by changing the envelope shape to reduce (or at least measure) the effect of multipath.
  • throw0101a 6y ago
    See: > The FAA's network of Distance Measuring Equipment (DME) NAVAIDs will provide a PBN-capable† backup to GPS; however, for aircraft without scanning DME receivers (DD) or DD with Inertial Reference Unit aiding (DDI) equipment, the FAA will provide a conventional navigation backup service based on the VOR MON. The VOR MON is designed to enable aircraft, having lost GPS service, to revert to conventional navigation procedures. * https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gbng/vormon/ https://www.faa.gov/about/office_org/headquarters_offices/at... * https://www.federalregister.gov/documents/2016/07/26/2016-17579/provision-of-navigation-services-for-the-next-generation-air-transportation-system-nextgen https://www.federalregister.gov/documents/2016/07/26/2016-17... † Performance-Based Navigation