Which couple of navaids have the better accuracy, DME/DME or VOR/DME?
Many thanks.
Comments (5)
DME/DME is more accurate. FMS INS systems will use the priority of GPS, DME/DME, VOR/DME, IRS for their position solution.
DME is more accurate & is the reason that a number of them will be located in areas requiring a higher degree of accuracy.
Many thanks for your answers.
We may say that the PBN enacts the use of the GNSS in the continental enroute phase with the support of the DME/DME Wich provides accuracy and also integrity (you may compare) of the GNSS signal and the use of the GNSS+INS in the oceanic enroute phase, providing GNSS to INS accuracy and INS to GNSS integrity.
The modern/contemporary FMCs use hydrid GPS inertial data and when GPS is not available revert to hybrid radio inertial data, usually including DME/DME, VOR/DME and ILS (LOC).
For example for the 737NG/MAX, the FMC position updates from navigation sensor positions are used in the following priority order: GPS, DME/DME, VOR/DME, LOC/DME and LOC.
Many thanks Robert, and I understand the 737NG/MAX when taking the data coming from GPS, that data is generated really by the GPS+INS system, or as you mentioned before the hybrid GPS inertial data system.
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