Questions tagged [dme]
DME (Distance Measuring Equipment) is, as the name suggests, a system for measuring the slant distance between a suitably-equipped aircraft and a ground-based transponder station; DME stations are often colocated with VOR or ILS installations.
22
questions
4
votes
1
answer
141
views
What are the modulation parameters of a DME?
I am having difficulties finding specific information about DME pulse pair modulation. As far as I understand, the gaussian shaped pulse pairs are modulated using amplitude modulation. The carrier ...
- 43
0
votes
1
answer
142
views
Although the missed approach point in the profile view is 1.1 DME-400 feet, the GS out reference altitude is given as 410 feet in 1.0 DME. HOW?
Although the missed approach point in the profile view is 1.1 DME-400 feet, the GS out reference altitude is given as 410 feet in 1.0 DME. HOW?!
Based on GS out reference altitudes, we are expected ...
- 2,049
1
vote
1
answer
91
views
Why don't the Altitude-DME values in the approach profile match the Groundspeed-FPM values in the conversion table?
Why don't the Altitude-DME values in the approach profile match the Groundspeed-FPM values in the conversion table?
When the calculation is made with the values given in the conversion table, the ...
- 2,049
4
votes
3
answers
368
views
is DME groundspeed slightly inaccurate due to slant range?
When DME is calculating aircraft ground speed, is it doing it based off of the slant range? Wouldn't this mean that if the aircraft is at sea level and the DME is at sea level that the GS would be ...
- 886
9
votes
2
answers
507
views
"w/o DME" minimums on DME required approach
I've found this ILS-Y 26 EPBY approach, where there are two LOC minimums: With D3.0 and w/o D3.0 on Jeppesen chart. On the original AIP charts it says "When stepdown fix not received", but ...
- 91
3
votes
1
answer
274
views
How does increasing the rate of pulse pairs in DME 'search' mode help?
From How does an airborne DME unit differentiate itself?
The higher rate in SEARCH [150 PP/S] gives it more opportunity to detect the replies as it has no knowledge of range in search and thus has to ...
- 689
4
votes
1
answer
285
views
How do you calculate the deviation from an RNAV waypoint radial?
As a clarification at the beginning: I'm talking about non-GPS, pure VOR-DME based RNAV devices here.
On RNAV devices that use just the selected VOR-DME, not GPS, the phantom radio station is set up ...
- 1,374
5
votes
1
answer
504
views
What does a DME indicator do in HOLD or RNAV mode?
I found this DME indicator on the Cessna 210. Its mode switch has four positions - NAV1, NAV2, RNAV and HOLD. NAV1 and 2 are clear - it uses the NAV1 and 2 freq respectively. I'm wondering what the ...
- 1,374
0
votes
0
answers
117
views
Can an IFR civilian aircraft use a TACAN for DME distances? [duplicate]
Flying the KRDR LOC RWY 35 approach. How do I get my DME distance to HONNE or CANLI? can we pick up DME distance from a TACAN? Just used GPS Overlay but can we get distance from the TACAN?
- 73
8
votes
2
answers
1k
views
Are there two navaids on the same frequency close enough to be confused?
Several RTCA DO standards require checks for bad navaid tuning including, "In lieu of using ground-based navigation aid designated operational coverage (DOC), the system should provide, checks ...
- 6,725
13
votes
2
answers
3k
views
How can the A320 receive 3 DME signals if it has only 2 DME receivers?
How can the A320 receive simultaneously 3 DME signals (VOR1 + VOR2 + ILS) if it has only 2 DME receivers (and antennas)?
Does it multiplex them in some way? If yes, does it mean if one DME receiver ...
- 1,944
1
vote
1
answer
160
views
How does a VOR or a VORDME affect the coding decision between CF or IF-TF respectively?
I was reading of the following case in ARINC 424-17 spec. Unfortunately the image is copyrighted and I can't paste it here, so here is a low(er) quality image of mine replicating the situation:
The ...
- 6,970
1
vote
1
answer
250
views
How is DME station ident coded in ARINC 429?
I understand that labels 242,244, 246, 247 are set for DME Station Id or DME Station Ident. they are marked as discrete. How should I convert the station code from alphabet to these 'discretes'? The ...
- 11
1
vote
3
answers
863
views
What button do I push on the instrument panel to activate DME in VOR navigation? [closed]
For some strange reason I cannot seem to find any information about what button to push on the instrument panel to active the DME. There is plenty of information about how DME works with ...
- 1,107
2
votes
2
answers
361
views
What does it mean to "lock on" to a DME ground station?
I was just reading about the working of the DME the other day and then I read a para which said:
The aircraft interrogator "locks on" to the DME ground station once it
recognizes a particular ...
- 1,703
4
votes
2
answers
2k
views
Why don't aircraft have DME that can automatically convert the slant range to ground range?
Knowing that $a^2 = b^2 + c^2$ where $a = \text{slant range},\ b= \text{ground range},\ c = \text{height}$.
Why can't the DME equipment which calculates the slant range then just convert it to the ...
- 103
8
votes
1
answer
847
views
How does an airborne DME unit differentiate itself?
The FAA's IFR handbook glosses over a keypoint:
The aircraft DME transmits interrogating radio frequency (RF) pulses, which are received by the DME antenna at the ground facility. The signal ...
user14897
0
votes
3
answers
3k
views
How can I know DME distance? [closed]
When I fly 12000ft, how can I know a distance from DME station?
Is there any formula to know or measure distance from DEM?
- 477
0
votes
1
answer
2k
views
What is the available range for DME, and why do we need EFC?
How far from the station can a DME signal be picked up, and why do we need EFC?
- 477
8
votes
1
answer
2k
views
How can I triangulate a position using two DMEs?
What is the formula for determining an aircraft's position (latitude, longitude) using barometric altitude and the ranges to two DMEs?
- 93
0
votes
1
answer
433
views
Do UAVs use ground-based navaids?
When I Googled it seems it is not common to use Vortac like systems from UAVs as a backup to GNSS outages, like in manned aircraft. And also I haven't seen any equipment designed for just UAV ...
- 93
5
votes
1
answer
1k
views
Are there benefits in training instrument students how to fly a DME arc?
With more instrument approach procedures being designed for RNAV/GPS equipped aircraft, and considering the high level of radar coverage currently available, is there a need to spend valuable training ...
user22445