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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40
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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?
29
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1answer
5k views

Why are commercial flights not (publicly) trackable in some locations?

Flying BA15 from London to Sydney, I noticed that the flight is not tracked over Turkmenistan and Afghanistan, except for a short ping. Is this for security reasons? Do planes disable their ADS-B, or ...
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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 ...
27
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2answers
5k views

What are these vehicles with no callsign used for?

I keep seeing these land based vehicles whenever I am looking airports on flightradar24, like in the image below: Why do they come up on the radar? Do they have a transponder? What is the purpose of ...
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?
21
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1answer
6k views

How does ATC radar/ADS-B ground stations not get confused with signals sent from multiple aircraft?

I understand that the radar sends a 1030 MHz interrogation signal to an aircraft and the aircraft's transpoder responds using 1090 MHz. When it comes to Mode S squitter, the transmissions are ...
16
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1answer
1k views

Why are there so many ADS-B ground towers in western Colorado?

I was reading up on Appaero's new ADS-B OUT transponder and clicked over to the Stratus coverage page for some reason. Then I glanced at the map, and noticed something interesting: Western Colorado ...
15
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3answers
2k views

Do pilots ever use the aircraft's ICAO 24-bit address when communicating with ATC?

Do pilots know the unique ICAO 24-bit hexadecimal code for their aircraft? Do they ever give it directly to ATC? For example, to controllers who make the flight strips with destination, departure, ...
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 ...
14
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1answer
3k views

Will a portable ADS-B unit, like Stratus, meet the requirements for my aircraft to be ADS-B equipped by the 2020 mandate?

There is a lot of confusion around what it means to have ADS-B. What is the minimum equipment required to meet the mandate? Can I use a Stratus to meet that requirement?
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 ...
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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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 ...
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 (...
10
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2answers
347 views

What will create a “traffic puck” on the UAT band?

I know that for ADS-B in the US to receive TIS-B information you need to be a participating aircraft (ie ADSB-Out). My question is more specifically, if you are flying an aircraft with a 1090ES ...
9
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2answers
12k views

What is the difference between ADS-B UAT and ADS-B ES?

Why would an owner decide to put in an ADS-B UAT transceiver versus an ADS-B ES transceiver? What are the advantages and disadvantages of both systems?
9
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2answers
202 views

Received ADS-B TC=31 message with non-existent version 3?

On several dates, my ground station received some airborne operational status ADS-B messages (TC=31) where the version number was reported as 3. As far as I know, ...
8
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2answers
671 views

Will 1090 Mhz band become too congested in the future?

1090 Mhz is currently used for SSR Mode A/C replies and Mode S communication(ELS-EHS replies and ADS-B broadcasts) by civilian aircraft and some of military IFF modes. With the infamous 2020 ADS-B ...
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?
7
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1answer
998 views

Is it recommended to have an ADS-B transponder in ALT mode on the ground? [duplicate]

Early on in training I was told that unless the airport specifically noted it on the chart, that the transponder was turned to ALT (altitude) mode just prior to taking the runway for take-off (lights, ...
7
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1answer
344 views

Will ICAO 24 bit addresses suffer the same fate of IPv4?

As we know; both IP addresses and Mode S (ICAO) addresses are relatively short. With local networks and NAT (Network Address Translation), there is not an urgent need for transition to IPv6. But how ...
7
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2answers
1k views

What are Mode C requirements with ADS-B 978?

ADS-B out is available on the 1090 (Mode S) band, and can even be implemented as a firmware update to some Mode S transponders. In the case of 978 ADS-B Out, I believe that it is still necessary to ...
7
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1answer
628 views

Is this a glitchy ADS-B signal? [duplicate]

I was looking through my virtual radar logs one of the days and found this "glitchy" ADS-B behavior. I am almost 100% sure that this is not due to my antenna or setup since two independent different ...
7
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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 ...
7
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3answers
170 views

TIS-B anonymous address

I could not understand what is the difference between ADS-R with anonymous address (CF=6, IMF=1) and TIS-B CF=5, which on ICAO Doc 9871 is described, for Version 1 as: Fine TIS-B Message AA field ...
7
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1answer
2k views

How do military fighter aircraft identify themselves and each other?

I live in an area where there is much NATO military activity. Often there are various fighter aircraft fly-overs. But none of the common websites such as flightradar24, flightaware and ...
6
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2answers
2k views

What kind of ADS-B identification code is FFxxxx, where xxxx are numbers i.e. FF0024?

I live near an airbase and use an ADS-B receiver that picks up aircraft using regular ICAO assignments. They do not include flight path details or position info, but can be identified by the ICAO ...
6
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3answers
155 views

NEXRAD—why is it 2D?

If you paid attention to NEXRAD training, you know that the colors of pixels show the maximum activity at any altitude in that air column. (It’s a “composite” view.) NEXRAD itself samples in three ...
6
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4answers
3k views

What are the options for installing ADS-B OUT in a Cessna Citation to meet the regulations?

So I have a friend that works for a company that owns a Cessna Citation. His company is looking to comply with the ADS-B regulations. He has been given the task of making a business case for actually ...
6
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1answer
418 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 ...
6
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1answer
1k views

What's required for the ADS-B to function? A GPS or Mode S Transponder?

Jeppesen defines the ADS-B as a surveillance system broadcasting GPS-derived positions and other information such as velocity over the data link. Yet, the Wiki article on ADS-B relates it to the Mode ...
6
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1answer
823 views

What do the radiation patterns of ADS-B transmissions on large airliners tend to look like?

In the recent article Flightradar24 gears up for a new wave of flight tracking I've read about FR24's experimental Wave Glider ADS-B receiver - essentially a self-propelled, solar power buoy as a ...
6
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2answers
414 views

When will the Canadian ADS-B satellite system be implemented?

It is interesting that ADS-B is not mandated in Canada as of yet. If you fly in the US you quickly realize the benefits. Now as I understand it Nav Canada is the largest shareholder in Iridum but ADS-...
6
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2answers
1k views

Where are US FIS-B UAT ground facilities located?

In the US there are Flight Information Services Broadcast (FIS-B) transmitters strategically located to provide WX, NOTAMS and other flight information utilizing the ADS-B infrastructure. ADS-B has ...
5
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2answers
525 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?
5
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1answer
657 views

How can I determine takeoff and landing from an ADS-B feed?

An ADS-B feed consists of a series of latitude, longitude and altitude points, without any "start" or "end" markings as such. Using this data, which can contain arbitrary gaps and errors, what's ...
5
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2answers
1k views

Can ADS-B DF-17 messages with a non-zero remainder after CRC check be used?

For fun I've been using an AirSPy SDR (Software Defined Radio) to receive and decode ADS-B packets, primarily DF-11 and DF-17 messages. The code is written in C++ and works reasonably well. It ...
5
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2answers
1k views

Why does the 1090 ES use the same frequency for both uplink and downlink?

The 1090 ES is the transponder system used in ADS-B. Why does the 1090 ES use the same frequency (1090MHz) for uplink as well as downlink? 1090 ES is an extension of Mode S. The Mode S used 1030MHz ...
5
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1answer
115 views

What kind of input is used by NASA's TASAR?

I've found the Aviation SE to be a really interesting read so far, I'm excited to be here! I'm fairly new, but I'm also old! What are the inputs for TASAR to crunch flight path optimization? Is it ...
5
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1answer
435 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 ...
5
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1answer
183 views

What is the minimum set of registers to fill for ADS-B?

I am researching about Automatic Dependent Surveillance-Broadcast mode of Mode S currently. On a third party document, I encountered a list of transponder registers to be filled; 05, 06, 07, 08, 09, ...
5
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1answer
804 views

How can I correctly decode CPR positions from ADS-B frames?

I am decoding Compact Position Reporting (CPR) positions from ADS-B frames (the airborne position and surface position frames). Most of my results give realistic longitude/latitude values, but some ...
5
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1answer
532 views

How does FlightAware correlate flights to Part 91 flight plan data?

I'm looking at some flights in FlightAware. With the scheduled air carrier flights, their call-sign can be crossreferenced with a flight schedule database to determine the origin and destination. How ...
4
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2answers
1k views

On an ADS-B In display, do the pilots see the squawk code or call sign for other aircraft?

If I understand correctly, with a ADS-B In equipment or TCAS equipment on board, the pilots could see the surrounding traffic with its assigned squawk code like "4653", is that right? But could the ...
4
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1answer
799 views

How to leverage Lynx NGT-9000's integrated GPS/WAAS?

I’m inheriting an IFR capable 1964 Cherokee 235 that is not equipped with a GPS. I’m looking at installing a Lynx NGT-9000 to get ADS-B compliant and gain the traffic and weather information. Is ...
4
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1answer
542 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 ...
4
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1answer
660 views

What ICAO codes are reserved for TIS-B use?

Using my ADS-B receiver, In the past few months I've seen a lot of what I think are TIS-B contacts. They seem to cycle through a few different ICAO ID prefixes, but I see a lot that are of the form (...
4
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3answers
398 views

Has anyone been able to verify ADS-B works without radar?

I know that one of the biggest advantages of ADS-B is "supposed" to be that it will directly communicate between equipped aircraft without ground support. Has anyone actually seen that in action? That ...
4
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2answers
379 views

Is ADS-B UAT required below 18,000 ft for ADS-B ES equipped aircraft?

If an aircraft is flying in the USA with 1090 MHz Extended Squitter (ES) and it is below 18,000 feet, does it then need to also have 978 MHZ Universal Access Transceiver (UAT) so that aircraft flying ...