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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27
votes
3answers
10k views

Why do aircraft on Flight Radar 24 jump around randomly sometimes?

I use Flight Radar 24 on my iPad to track friends/families flights when they are traveling (not paranoia, just curious). I've noticed that, quite often, their plane will jump from one location to ...
40
votes
12answers
31k views

Why don't all commercial aircraft transmit GPS data in real time?

It seems strange that trucks and taxis can be set up to transmit GPS data in real time but aircraft cannot. Wouldn't this be a useful function and feasible to implement?
23
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3answers
2k views

What is ADS-B and who needs it?

I read that ADS-B is required by the year 2020. What does this mean? What is ADS-B used for, and who needs it?
0
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1answer
111 views

What additional airspace will be off-limits to an a/c w/ no elect. system or xponder under 91.225 (ADS-B) compared to under 91.215?

Under FAR 91.225 (requirement for ADS-B-out), what additional airspace over the 48 contiguous states in the U.S. will be off-limits to an aircraft w/ no electrical system or transponder, compared to ...
14
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6answers
4k views

How can ADS-B replace primary radar when FlightRadar24, using ADS-B, is so inaccurate?

I read the following on Flightradar24.com's 'How it works' page. The percentage of aircraft equipped with ADS-B receivers is steadily increasing though, as they will become mandatory for most ...
8
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1answer
3k views

Are squawk codes used with ADS-B?

When using ADS-B are squawk codes still necessary or does the unit provide a discrete code (like a tail number or something) that is recognized by ATC?
6
votes
1answer
419 views

Is ADS-C used in practice?

Both the FAA and the EASA have decided against using ADS-C in the development of NextGen and SESAR, because of cost, scalability and ease of use. But has ADS-C actually been implemented and used in ...
3
votes
1answer
241 views

Is there a planned ADS-B update that would allow ATC to view an aircraft's traffic coverage?

ADS-B allows a plane to broadcast its GPS location to other planes and ground stations used by ATC. The range is 200nm for A/A and 180nm for A/G (source). Same SSR coverage issues would still impact ...
0
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1answer
320 views

A question about FAR 91.225(e)(2) — pertains to ADS-B-out requirement and exemption for aircraft with no electrical system

This is a question about FAR 91.225 (requirement for ADS-B-out) and where aircraft with no electrical system will be able to fly. FAR 91.225 exempts aircraft with no electrical system from many of ...
12
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1answer
4k views

How does the ADS-B compact position report NL() function work?

I'm trying to decode ADS-B messages for a school project, and I cannot reproduce the results of the NL() function as described in this document. I've seen the same formula in several other documents. ...
11
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1answer
2k views

Why did this aircraft re-route?

I was looking through my ADSB Virtual Radar outputs couple days ago and saw a weird re-route for one of the aircraft that looked out of place. Can one of the pilots/ATC guys pitch in to help me ...
10
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2answers
2k views

Is ADS-B intended to replace other traffic management systems?

What is the main purpose of ADS-B? How do aircrafts interact with each other using them? Is it intended to replace the Traffic Collision Avoidance System (TCAS) or ground based Air Traffic Control (...
5
votes
1answer
440 views

Is there any reason to have ADS-B out that is not based on GPS?

The ADS-B system is only as accurate as the location data source it uses. In the US the 2020 ADS-B mandate requires that horizontal location data be from a GPS source with minimum performance ...
2
votes
3answers
425 views

Does the 2020 ADS-B -Out requirement apply to aircraft with only a wind-driven generator (electrical system)?

Since my J3 Cub was was not originally certificated with an engine-driven electrical system it's clear the 2020 ADS-B-Out mandate (U.S.) does not apply (except where specifically noted in FAR part 91)....
13
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1answer
924 views

What is the relation between aircraft altitude and ADS-B coverage?

While reading the description of ADS-B given on the FR24 website (ADS-B How it works), I came across this sentence: The farther away from the receiver an aircraft is flying, the higher it must fly ...
11
votes
5answers
3k views

How can ADS-B be secure when it is based on self-reporting?

By all reports, ADS-B is the future of air navigation and ATC. In the simplest definition, ADS-B is aircraft self-reporting GPS position to benefit everyone. How is this secure? Seems like someone ...
7
votes
2answers
1k views

How can I get flight destination from ADS-B?

If I have aircraft details such as the callsign, transponder code, and ads-b info, how can I look up the departure and arrival airdrome? Is there an API to obtain this information in a programmatic ...
5
votes
2answers
527 views

Can I use my non-WAAS GPS receiver with ADS-B in the United States?

I have a older style Garmin 530. Can I use this GPS as the position source for an ADS-B installation?
4
votes
1answer
544 views

How many commercial jetliners are equipped with ADS–B?

The Wikipedia page for Automatic Dependent Surveillance – Broadcast (ADS–B) explains that the aircraft surveillance technology is being phased-in around the world currently, with some due dates in ...
3
votes
1answer
609 views

Where can I find examples of ADS-B surface (ground) position data?

To check my decoding it would be helpful to have some correct reference data for checking input and output as follows: Input: 19-bit Compact Position Reporting (CPR) even latitude and longitude / odd ...
2
votes
1answer
536 views

How do ADS-B and ADS-C get used on transoceanic flights?

I have three questions regarding ADS-B and ADS-C. (Hopefully you don't feel my questions are not related.) (1) What's the scope of availability of ADS-B? Let's say an airliner equipped with all the ...
0
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1answer
34 views

Does the FAA construe FAR 91.225 to prohibit aircraft w/o electrical systems w/o ADS-B-out from flying above 10,000' MSL unless below 2500' AGL?

Does the FAA construe FAR 91.225 as imposing a general prohibition on flight above 10,000' MSL (excluding airspace below 2500' AGL) in aircraft without ADS-B-out, even for aircraft without engine-...