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A UHF Tactical Air Navigation beacon (TACAN) is a navigation system developed by military and naval forces providing, as far as the navigating pilot is concerned and for suitably equipped aircraft, the same indication as a VOR/DME system (i.e. it provides bearing and range distance information).
Henc, for a TACAN the following additional properties defined in PANS-AIM for the minimum AIP dat aset for radio navigation aids are relevant:
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The diagram below shows the AIXM classes, including the relevant data types, needed to encode that information The main class is the TACAN which is a specialisation of the NavaidEquipment.
TACAN Channel
The channel of the TACAN system is coded using the TACAN.channel attribute.
In case a TACAN is collocated with a VOR (i.e. for a VORTAC), certain requirements have to be taken into account regarding frequency pairing.
Elevation
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Elevation
As the TACAN provides distance information the elevation of its antenna is relevant. It is coded using for the TACAN.location using the ElevatedPoint.elevation will be coded attribute.
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| The ElevatedPoint.elevation for the Navaid.location has not to be coded. |
Depending on the type of DME different accuracy is required (According PANS-AIM Appendix 1, Table A1-5, for DME.type equal-to 'PRECISION' 3m accuracy is required for all other types it is 30m (100ft).
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As TACAN is not covered by PANS-AIM no accurcy value is defined for its elevation. However, AIXM provided the possibility to code it using the ElevatedPoint.verticalAccuracy attribute.
Navaid Component
VORTAC
A TACAN may be co-located with VOR. Such a VORTAC will be coded as a Navaid with two correspondning NavaidEquipment instances, a VOR and a TACAN.
The For both NavaidEquipment the NavaidComponent.collocationGroup for both navaidEquipment will be coded with will be equal-to '1'.
If the VOR is the navigable location of the navaid when the navaid is used as significant point:
the NavaidComponent.providesNavigableLocation for the VOR will be equal-to 'YES' and the NavaidComponent.providesNavigableLocation for the TACAN will be equal-to '1NO'.
When using a VORTAC for civil purposes, in general, the VOR provides the bearing information, whereas the TACAN is used for the distance information.
Coding Rules
TBD
Coding Examples
See topic Navaid [NAV].TBD