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A comment on Back-ups for GPS: Satellite-navigation systems at risk of jamming. Parent comment

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.
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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

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