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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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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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-...
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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 ?
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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?
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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-...
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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 ?
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 "...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Was NextGen simulated/tested against alternatives?
Researchers in aviation usually test systems in simulated environments to find out the pros, cons, challenges, etc. Now ADS-B is a key component of NextGen and its European counterpart. And I've seen ...
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Why weren't SA-On GPS units updated to become SA-Aware?
SA = Selective Availability (gps.gov)
SA-On and SA-Aware are widely used in current air transport aircraft (...)
GPS that behave as if SA is still active (SA-On)
GPS that behave as if SA has been ...
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What is the accepted ADS-B quality indicator value from EASA/FAA?
I'm doing research that has to do with the ADS-B quality indicators. With the ADS-B quality indicators I've received, I want to compare them with EASA's or FAA's requirements for each ADS-B Version (...
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Relation between Squawk code and ICAO adress
I can see in ADS-B downlink format 5 or 21, it is possible to answer squawk code. I am wondering how ATC will know which squawk code is coming from which aircraft? There is no possibility to encode ...
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Can military aircraft send out false ADS-B tracking information?
Can most military and VIP aircraft out of Andrews AFB transmit false ADS-B signals?
Here is the ADS-B tracking of Navy P-3 Orion that seems to be violating Iranian air space tonight if the ADS-B is ...
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How will the update from DO-260A to DO-260B improve safety and efficiency in air traffic management significantly?
From what I know, the version update from DO-260A and DO-260B offers new features such as on-ground vs airborne source selection logic, ADS-B failure annunciation, the split of the quality indicators ...
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FIS-B lookahead for SUA Status
While reading over the recent FDC NOTAMs, I saw this interesting entry come up:
...
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What is the broadcast rate of an ADS-B message?
From what I know, ADS-B (DF=17) message structure is 112 bits long. In terms of type of messages it transmits, there are aircraft identification, surface position, airborne position with baro altitude ...
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