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Questions tagged [ads-b]

ADS-B (Automatic Dependent Surveillance - Broadcast) is a surveillance technology that works by broadcasting GNSS position, velocity and identity to interested parties. It can be used as a supplement to or alternative to radar systems for tracking aircraft. It is a component of the FAA's NextGen ATC improvements, as well as the European SESAR programme.

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Where does FlightAware obtain the filed flight plans under the "Flight Data" section?

Visit the FlightAware page for a random flight, say https://www.flightaware.com/live/flight/QFA570 Now under the "Flight Data" section, sometimes we'll see an entry called "Route" ...
iaexo's user avatar
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6 votes
3 answers
131 views

ADS-B - Measure distance from position on ground to an aircraft

I have a docking station for autonomous drones in the field. It is equipped with a Raspberry Pi, an 1090 MHz ADS-B stick, and it knows it's geometric position from a previously done precise ...
user3792852's user avatar
0 votes
0 answers
64 views

Calculating True Altitude from ADS-B Data [duplicate]

I am working on a project and need to determine the altitudes of airplanes (trying to determine when they are landing/doing a touch and go). I have an ADS-B receiver receiving data from the airplanes. ...
Spencer Thomas's user avatar
1 vote
2 answers
164 views

How impactful could an ATC-specific speech-to-text AI model be for the aviation industry?

Various initiatives, such as the European SESAR 3 program, the Airbus Speech Recognition Challenge, or Appareo's technology, highlight a growing interest in tailored Automatic Speech Recognition (ASR) ...
A R's user avatar
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0 votes
2 answers
63 views

Mode-C & ADS-B Out rings around class Bravo airspace

My ADS-B Out unit (and EchoUAT), is broken, (wifi out) and I need to send it back to be repaired/replaced. While it is out, I will only have a legacy Transponder with Mode-C. Can I fly over (above) ...
Charles Bretana's user avatar
3 votes
1 answer
201 views

N-Number to ADS-B mode s code relationship

I just changed my n-Number. The new n-Number was approved on 21 December. I have already put the new n-Number on the plane, and I want to fly with it, but I read that the ADS-B aircraft identification ...
Charles Bretana's user avatar
2 votes
0 answers
49 views

ADS-B for satellite Tx in Canada

Can simple rod transponder antennas be used to satisfy the Canadian requirements for a top antenna to communicate with ADS-B satellites? (eg. RAMI AV-22)
prhutson's user avatar
1 vote
1 answer
96 views

Reasons for ADSB PAPR Report Altitude Errors

We have just test flown a new 1090 ADSB installation, using Apareo Stratus ESG Transponder, which has internal GPS. The PAPR for the test flight show both Baro Alt and Geo Alt errors in the Missing ...
The Doc's user avatar
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0 votes
0 answers
390 views

garmin gdl 52 vs foreflight sentry?

Does it make sense to go with a garmin ADS-B with sirius XM or a regular foreflight sentry ADS-B? I am using garmin pilot but do not mind shifting to foreflight. On the flipside, i read that the ...
sam's user avatar
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5 votes
1 answer
735 views

Can I fly NYC Hudson River SFRA without ADS-B?

My Canadian PA28 doesn't have ADS-B. If I fly around and below A/B/C airspace, can I fly the NYC Hudson River SFRA? Or must I fill the ADAPT authorization form?
Tchedjan's user avatar
1 vote
0 answers
88 views

Mode S Transmission from Boeing 737 Integrated Standby Flight Display (ISFD) data?

During a recent flight, while in communication with London control*, we received a query about our RVSM (Reduced Vertical Separation Minima) compliance. Both the Captain's and First Officer's ...
tedioustortoise's user avatar
3 votes
1 answer
199 views

What was the FAA's official rationale for the ADSB mandate?

This might have been obvious at the time, but I can't find any articles that discuss the FAA's official standpoint on requiring all GA planes to equip. There was and still is a hefty cost to ADSB ...
Kenn Sebesta's user avatar
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0 votes
0 answers
79 views

How does ADS-B get pressure altitude? [duplicate]

I have learned that ADS-B out broadcasts both Pressure altitude and GPS Altitude. GPS altitude is, obviously, available from the GPS, but where and how does it determine pressure altitude? Does it ...
Charles Bretana's user avatar
17 votes
2 answers
6k views

Why are Search & Rescue aircraft looking for the OceanGate Titan submarine not visible on ADS-B Exchange?

Currently, there is an ongoing Search and Rescue mission being conducted by Canada, the United States, and commercial operators to find and rescue the crew of the OceanGate Titan submersible vessel (...
End Anti-Semitic Hate's user avatar
3 votes
1 answer
719 views

What frequencies are used to transmit ADS-B messages?

Presently, ADS-B messages are broadcast on 1090 Mhz Mode S Extended Squitter VHF Data Link Mode-4 (VDL-4) Universal Access Transceiver (UAT) 978 Mhz First 2 Frequencies have relevant ICAO standards ...
Krishna Kanth's user avatar
1 vote
1 answer
140 views

Who are the audience of ADS-B?

If an aircraft has only Mode-A xpdr, then ATC with the help of Primary radar (for Position determination) and secondary radar (for receiving squawk), places a blip(only squawk code/callsign, position-...
Krishna Kanth's user avatar
0 votes
1 answer
145 views

Why the ADS-B out doesn't broadcast the True air speed in its ES message?

The ASTERIX (version 2.1) items of ADS-B GS cat 21 contain True air speed but when we check the Asterix data that we recieved by GS we did not find the True air speed value, why ?
Uniform's user avatar
  • 153
1 vote
1 answer
180 views

Distinguish between planes and helicopters with ADS-B messages

Is there a way to reliably distinguish between planes and helicopters using an ADS-B receiver only (no aircraft database)? I think of using heuristics like "if ground speed > 250 mph then it's ...
Enrico Detoma's user avatar
1 vote
0 answers
92 views

Detecting plane or helicopter landing using ADS-B messages only

Let's suppose I only have an ADS-B receiver. I want to detect aircrafts landing at the receiver's location, and estimate the time they will take to land. What would be the most reliable way to perform ...
Enrico Detoma's user avatar
1 vote
2 answers
289 views

If ADS-B is on majority of aircraft, why don't we start seeing ASR dying out?

Are radars still needed, or will radars start coming down soon?
Boeing787's user avatar
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0 votes
2 answers
481 views

Will ADS-B eventually replace TCAS antennas on airliners?

I still seem to confuse myself about ADS-B. Will ADS-B eventually replace TCAS antennas on airliners? Or are those still a relevant part of the ADS-B system? And I guess just to add in, why don't ...
Boeing787's user avatar
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0 votes
0 answers
43 views

Aside from primary radar, how did ATC monitor planes' locations before ADS-B? [duplicate]

From what I understand, air traffic controllers can monitor planes with radar, often called primary radar, or with ADS-B. I've seen ADS-B called "secondary radar," although it isn't really ...
Someone's user avatar
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0 votes
3 answers
135 views

Can we calculate the range of the target from ADS-B out message?

The ADS-B systems is cooperative depending system it means that the ADS-B Ground station use only to detect and decoding the ADS-B out message. My question is can we calculate the the aircraft range ...
Uniform's user avatar
  • 153
17 votes
4 answers
6k views

Why are transponders to be turned off when in formation?

Reading through FAR AIM. I came across the ADSB section which stated that transponders should be turned off except for the lead plane. Why is this?
Boeing787's user avatar
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1 vote
0 answers
169 views

ADSB DF17 Altitude decoding

I develop ADSB DF17 messages decoding device. I see that barometric height decoding differs between documents, describing the encoding standard: https://mode-s.org/decode/content/ads-b/3-airborne-...
JWZ1996's user avatar
  • 11
7 votes
2 answers
3k views

Does baro altitude from ADSB represent height above ground level or height above mean sea level?

I am retrieving ADSB data from Opensky-network.org. I would like to know what the baro altitude represents, is it the height above ground level or above mean sea level ?
Canis_Lupas's user avatar
2 votes
2 answers
1k views

What is the bandwidth of a 1090ES ADS-B signal?

I cannot find an official, trustworthy source on the bandwidth of the 1090 Mode S extended squitter ADS-B signal. It is not even listed in DO-260C standard. I've seen ranges from 50 kHz to 11 MHz (...
Macuser's user avatar
  • 123
10 votes
2 answers
1k views

Why does ADS-B altitude from multiple landed planes vary so much from one plane to another?

When viewing ADS-B data from sites like FlightAware and Flightradar24 (and also from a personal antenna), the landed altitudes vary greatly from one aircraft to another. What accounts for this ...
bhamjman's user avatar
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1 vote
1 answer
129 views

Is it appropriate to determine approximate flight altitudes based on ADS-B landed altitude compared to runway elevation?

For small aircraft flying below 2,500 ft. AGL, is it appropriate to compare the landed ADS-B altitude (pressure calibrated AMSL) to the elevation of the runway in order to compute a reference offset ...
bhamjman's user avatar
  • 115
0 votes
0 answers
72 views

Quality indicators ADS-B out & Ground Station receiver

I have a question about quality indicators parameters: I discussed with a pilot about quality indicators . We talked about NIC and NACp parameters I received his quality indicators in my ADS-B Ground ...
Oussama SDR's user avatar
-1 votes
1 answer
330 views

What is the relation between ADS-B MOPS & quality indicators? [closed]

I have some questions about ADS-B & MOPS, What is MOPS, What is the relationship between MOPS and ADS-B out and Ground Station Does the ADS-B have MOPS If we have Ground Station with different ...
Oussama SDR's user avatar
-1 votes
1 answer
310 views

How to interpret the Message amplitude in ASTERIX CAT 021 out of an ADS-B receiver? [closed]

As we know that the ADS-B use only in the reception so it's has own dynamic range. The ADS-B ground station receives a signal from an aircraft and after the processing its will convert it to ASTERIX ...
Oussama SDR's user avatar
9 votes
1 answer
2k views

Does ADS-B use its own antenna?

In the aircraft we have: ADS-B out/in using 1090ES A/C or Mode S transponder for SSR grounding interrogation. Does the ADS-B out use the same antenna as Mode S or does it use its own antenna?
Oussama SDR's user avatar
1 vote
3 answers
688 views

What does “ADS-B IDENT” mean?

What do pilots do when ATC tell them "ADS-B IDENT" (for an Airbus A-330)? It happened when the aircraft flew into Singapore FIR at FL350. At the first contact with ATC, they are told "...
William Cat's user avatar
6 votes
2 answers
471 views

Can ATC provide vectors and separation service to and between IFR aircraft in areas where radar coverage does not exist using ADS-B only?

In the U.S., can ATC provide vectors and separation service to and between IFR aircraft in areas where radar coverage does not exist using ADS-B only? If so, are the separation standards the same as ...
user avatar
1 vote
1 answer
21k views

Why do some military flight appear on Flightradar but some not?

I often see military flights in the sky, which do not appear on FlightRadar24. I do understand that low-flying military airplanes do no necessarily get picked up by these trackers, and that some ...
U_flow's user avatar
  • 3,655
4 votes
1 answer
717 views

Does the ATC not receiving Mode C and intermittently other transponder information imply that the Mode S transponder itself has an issue?

I had ATC report to me inflight today that they were not receiving my Mode C (altitude data). Intermittently, they also reported they were not seeing any other transponder information. My transponder ...
Charles Bretana's user avatar
2 votes
1 answer
547 views

Is ADSB required in Class C airspace when the tower is closed?

Many Class C airspaces do not have a full-time tower and the airspace reverts to Class E or G when the tower is closed. The wording in CFR Part 91 § 91.225 doesn’t specifically say whether ADSB is ...
JScarry's user avatar
  • 7,464
0 votes
1 answer
2k views

Can single engine/smaller aircraft turn off ADS-B?

I was just looking at the adsbexchange website, and was wondering if it was possible for smaller, private aircraft to turn off their ADS-B? I was wondering this because id figure that maybe not ...
Obama. The real obama.'s user avatar
7 votes
2 answers
11k views

What's the relation between ADS-B and MODE S

I know that ADS-B uses 1090ES or UAT to transmit their signal, and 1090 ES is related to MODE S. Here's my questions. What's the 1090 ES? If a aircraft uses 1090 ES as their ADS-B out, Does aircraft ...
Min's user avatar
  • 661
1 vote
0 answers
199 views

Are ERA5 Pressure Level and ADS-B Geometric Height comparable?

I have two wind data sets that I want to compare: a) Aircraft derived data (ADS-B and Mode-S). b) ERA5 Reanalysis data. To compare both I need altitudes to be comparable. On data set a) I have the ...
Marius Marinescu's user avatar
3 votes
2 answers
509 views

Does 'RADAR' include MLAT or ADS-B, etc?

Nowadays, There are many surveillance systems other than PSR or SSR, such as ADS-B or MLAT, etc. And ATC system such as ARTS uses various surveillance sensors including ADS-B to indicate track for ...
Min's user avatar
  • 661
4 votes
1 answer
324 views

Can pretty much anyone run/operate a primary radar? [closed]

Thinking about increasing the amount of information one receives beyond that from one's own 1090 MHz ADS-B in receiver when following aircraft as a hobby, is it perceivable and possible to operate a ...
Martin's user avatar
  • 143
22 votes
4 answers
4k views

My N number showed up on another plane's flight on FlightRadar24. How does that happen?

My Cessna 150F has never had ADS-B out. It has had the same N number since 1967. But yet, FlightRadar24 shows a flight a few weeks ago, perfectly tracing the coast north of San Diego, 2,000 miles from ...
David Hempy's user avatar
4 votes
1 answer
948 views

Does ADS-B signal contain the aircraft type?

I am working on the construction of an atmospheric model that calculates GHG emissions from aviation transport in France, as input I need an aviation traffic report as well as information on the type ...
MigueL's user avatar
  • 43
3 votes
1 answer
2k views

What does prevent installing an ADS-B transponder on a vehicle?

FlightRadar24 indicates they also track ground vehicles: Ground vehicles visible on Flightradar24 are generally those that are most active in the movement areas of an airport, like airport rescue and ...
Furkan Karaman's user avatar
3 votes
1 answer
309 views

Why would my ADS-B airborne position decoding sometimes result in a latitude offset?

I am implementing my own ADS-B decoding station, mainly following Junzi Sun's work "The 1090 MegaHertz Riddle", and I am having an issue from time to time, with the latitude value having an ...
Eak'Lon's user avatar
  • 33
2 votes
1 answer
3k views

What is the difference between SSR and ADS-B?

Can someone explain what is the difference between SSR transponder and ADS-B. From what I know ADS-B is a capability that can be incorporated into a transponder, but I do not understand the difference ...
Konrad's user avatar
  • 1,983
0 votes
2 answers
286 views

Would one expect Canadair CL-215 or CL-415 planes to be equipped with a working ADS-B transpoder?

In a forrest fire in Greece, on which according to news sources eight such planes are operating as firefighters, no planes can be seen on Flightradar24. Only a fire service's helicopter can be seen ...
Diomidis Spinellis's user avatar
7 votes
1 answer
643 views

Question about congestion of the 1090MHz frequency

I'm no expert so there's likely to be a lot of mistakes in this post. ADS-B - Automatic Dependent Surveillance - Broadcast, (out) transmits (in) receives position data from/to other aircraft and to ...
Rory McDonald's user avatar