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Tacan    
战术空中导航系统

战术空中导航系统


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  • navigation - How does TACAN work? - Aviation Stack Exchange
    A TACAN can be installed on ships or mobile stations The TACAN antenna is externally similar to a conventional VOR A TACAN in Alaska during an exercise: (Source: Wikipedia) The cylinder contains the rotating antenna system In more modern TACAN, the mechanical rotation has been replaced by electronically scanned arrays, reducing the size:
  • Why do the military use TACANs, why not VOR DME?
    TACAN is more accurate because, instead of having a single rotating reflector producing an AM cardioid (or is it a limacon?), TACAN has 9 extra rotating reflectors Rather than using an omnidirectional FM signal, TACAN uses timing pulses: a 'Master Reference Burst' and others that tie in with the small reflectors
  • Why doesnt civil navigation equipment support TACAN?
    The TACAN station produces signals in response to the TACAN interrogation to determine range (by time measurement from the aircraft interrogation to the time of response receipt at the aircraft) and receives phase shifted signals to determine azimuth (bearing), whereas the (L-Band frequency) DME only produces range and the VOR operating at a
  • What are the differences between a VOR and a VORTAC?
    TACAN stands for TACtical Air Navigation, a military system that is similar to VOR but with higher accuracy It works on frequencies between 960 and 1215 MHz Part of the TACAN is DME (Distance Measurement Equipment), which works in the same frequency band The DME used in TACAN is the same that can be used by civil aircraft
  • Is it possible for a civilian to use a VORTAC station?
    Totally legal to tune it up use it If it is a VORTAC, it will work just like every other VORTAC out there If it is a TACAN, you may be able to get DME from it, but you won”t get bearing from it without a TACAN receiver Many, perhaps most VOR’s out there are in fact VORTAC’s — the TACAN station is colocated with the VOR
  • Formulae Tacan channel to VOR frequency - PPRuNe Forums
    The formula to get the DME(VOR) frequency from a TACAN channel is the following: There are two 'keynumbers' - 1063 and 1053 - which you have to add to the TACAN channel to get the DME frequency Up to channel 59 you have to add 1063 From channes 70 on you have to add 1053 Example: TACAN channel is 44: 44 + 1063 = 1107 = 110 7MHz TACAN channel
  • How does a TACAN signal change with bearing from the station?
    A TACAN or VOR station actually transmits two signals: a reference signal whose phase shift is independent of azimuth angle; a signal that is phase shifted, where phase shift (0-360°) equals the azimth angle; At the receiver side the phase difference of both signals is determined The phase difference equals the bearing
  • When was TACAN (or DME?) Y mode introduced?
    If I understand correctly, originally DME and the equivalent distance measurement aspect of TACAN had only the "X" channels where the pulse pairs are 12 μs apart, and later the "Y" channels were introduced (to TACAN only?) with 30 μs separation When did this happen, in the late 60s 70s era?
  • Tacan [Archive] - PPRuNe Forums
    TACAN bearing system works in a similar way to a VOR by sending out multiple signals from which the receiver can determine the radial by measuring the phase difference in the signals However, the TACAN's phase difference is repated every 40 degrees thus making it (in theory) nine times more accurate
  • accidents - If the VOR works and the TACAN works, why doesn’t the . . .
    DME transponders and interrogators are abbreviated TACAN transponders and interrogators Civilian aircraft only use DME but that just means they ignore the rest of the TACAN ground station broadcast when they interrogate a TACAN ground station A ground station will never have both DME and TACAN transponders: if it has TACAN, DME is redundant





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