Re:Back-ups for GPS: Satellite-navigation systems at risk of...
by throw0101a on Friday May 07, 2021 @10:24PM
(#27083140)
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-operational-netwo...
600 VORs will give complete coverage at 5000' AGL.
Re:Back-ups for GPS: Satellite-navigation systems at risk of...
by labcomputer on Saturday May 08, 2021 @01:52AM
(#27084301)
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.
Re:Back-ups for GPS: Satellite-navigation systems at risk of...
by throw0101a on Saturday May 08, 2021 @07:39AM
(#27086191)
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/at...
* https://www.federalregister.gov/documents/2016/07/26/2016-17...
† Performance-Based Navigation
[Edit/Add] I think that the FCC should include ground based navigation beacon transmitting as part of any terrestrial base station licensing. If every AM, FM, TV, Cell Phone station transmitted location/timing information that would greatly increase the number of sources to cross check, and increase coverage. With everything being SDR driven these days, it's just a software update.