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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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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Is RTCA DO-260 Change 1 the same as DO-260A?

I am a bit confused as to the history and the naming for 260 documents. This is the timeline I perceived. From earliest to latest: DO-260 ( September 13, 2000 ) DO-260 Change 1 ...
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In RTCA DO-260B, what were the reasons GVA was added ? Is it a replacement for something?

After digging up and reading through many documents, I have a rough picture of the evolution of DO-260 versions, particularly for its ADS-B Quality Indicators. For instance, in DO-260 (Version 0) ...
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Why do ADS-B outages occur without simultaneous RAIM outages?

If you check the ADS-B prediction tool and the RAIM prediciton tool on SAPT.FAA.GOV you will see far more ADS-B outages. What causes ADS-B outages to occur at different times than RAIM outages? Are ...
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Converting lat long & altitude into a line of sight target? [closed]

I want to design a long-range ADS-B receiver with a directional antenna (like a Yagi), but in order to maximize its range, I'll need to orient the antenna towards a target (plane) based on existing ...
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63 views

FIS-B Product Registry Location

I'm a software engineer that's interested in decoding raw FIS-B data. DO-267A (E.1) points me at http://fpr.tc.faa.gov/default.asp as the location of the FIS-B Product Registry. However, I have been ...
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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-...
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Is ADS-B required for flight under class B airspace but outside the Mode C veil?

In the U.S., can a non-ADS-B equipped aircraft legally fly under class-B airspace extensions that are outside of the 30nm Mode-C Veil circle?
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What is an approved weather source for flying an instrument approach into an airport with no working ATIS?

What can you use as viable weather information landing at an airport with ATIS inoperative due to the tower being closed after hours? Let's assume the approach secondary weather source is also ...
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Is ADS-B anonymous mode deterministic?

From what I can tell, this is the method of creating a temporary ICAO address in the 978Mhz UAT protocol: From https://www.icao.int/safety/acp/Inactive%20working%20groups%20library/ACP-WG-C-UAT-2/UAT-...
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Would FAR 91.227, or any other regulation, forbid use of ADS-B-out in an unregistered ultralight?

Would FAR 91.227, or any other regulation, forbid use of ADS-B-out in an unregistered ultralight? Could the N-number field simply be left blank, without violating any regulation or law? One possibly ...
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How does the ADS-B signal transmission randomization work?

As the FAA mentions, the ADS-B messages like Identification, Position and Velocity are transmitted randomly uniquely between $ 04 \pm 02 $ sec. How does the transmitter define that randomization? Is ...
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Does ADS-B In receive track or heading angles?

I am reading this: https://mode-s.org/decode/ehs/bds50-track-n-turn.html I am wondering the Track angle which ADS-B In recieve is really the track angle (derived from line joining the previous and ...
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What information an aircraft responder must give to mode S ground receiver

What is the minimum set of information (for ex.: aircraft registration, position, altitude ... and what else) that a transponder in an aircraft must provide after being interrogated by a ground ...
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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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Does turning off WAAS turn off ADS-B out as well?

I'm a CFII and for training GPS approaches with advanced students, I like to occasionally turn off the WAAS receiver on the 430/750/G1000/etc. when they are not looking, to simulate a WAAS failure and ...
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Does the TIS-B “hockey-puck” contain VFR mode-C targets with unconfirmed altitude?

When receiving TIS-B traffic via ADS-B In, I'm curious what mode-C targets are included. Is it only mode-C traffic with confirmed altitude in contact with ATC services (presumably with a transponder ...
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323 views

What is the difference between ACARS and ADS-B?

What is the difference between ACARS and ADS-B? For weather information in-flight or pre-flight which one is used?
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Do ferry flights to the US that are not ADS-B Out equipped require a special ferry permit from 1 Jan 2020?

The aircraft is not compliant with ADS-B Out DO 260B and will be parked in Arizona after return. Can this aircraft fly to the State for ferry flight only to US without ADS-B Out DO 260B? Should I ...
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What is the relationship between ADS-B IN/OUT and different mode transponders?

What is the relationship between ADS-B IN/OUT system and different mode transponders? Can a aircraft with mode A or C transponder have the ADS-B in/out capability, that is getting more detailed ...
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131 views

How could I match the surrounding traffics displayed with their radio communication

If I have a traffic display I could see the traffics in proximity of my aircraft and meanwhile I could listen to their voice communication. So how could I match the traffic shown in the display with ...
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Is there any current and/or upcoming technology that alerts Air Traffic Controllers in case of loss of aircraft separation?

Currently doing an assignment and it to analyse an accident where older atc systems could have been at fault. In 1995 there was an incident where two aircraft came closer than the then current ...
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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 ...
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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 ...
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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 ...
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136 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 ...
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371 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 ...
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Can ADS-B used for voice communications?

Everyone knows the radio communications doesnt sound great altough they work perfectly. But can the brand new ADS-B communications be used for carrying audio signal? Would it be clearer? The ADS-B ...
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How to know which data came from Mode S and which came from ADS-B (FIS-B)?

I'm dealing with recorded ADS-B data as a part of my thesis (programming-oriented). I have a table of ADS-B communication of an aircraft (image below) - I know, that some of these recorded data in ...
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What benefits does Automatic Dependent Surveillance bring to continental ATC over Mode S?

In particular, to the extent that there are mandates for it in USA and Europe? I checked various posts here and official descriptions (e.g., faa.gov), but I can't figure out the following: For ...
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562 views

When is squawk 1000 assigned in USA?

From Are squawk codes used with ADS-B?: Yes, squawk codes are still used and required with ADS-B. The post is 3 years old though. And from Wikipedia List of transponder codes: 1000: Used ...
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Getting data from Existing ADSB Receivers

Is there any way to get data from existing ADSB receivers installed around the world?
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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-...
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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, ...
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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 ...
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Will a non-certified GPS source work the same in ADS-B mandated airspace?

What happens if you use a non-WAAS GPS position source in ADS-B mandated airspace? Doesn't it work the same, except for the positional accuracy?
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How can I use an ADS-B receiver to make my aircraft visible in Flightradar24?

I recently bought a SENTRY ADS-B receiver for the aircraft in order to track the flight. How could I make Flightradar24 or Flightaware show my aircraft and how to register my aircraft on the website?
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What is the current state of the practice regarding surveillance and surveillance data integrity?

I am experiencing difficulties in finding out exactly how air traffic surveillance works in practice, and more specifically what is done to verify the integrity of surveillance data. ADS-B and other ...
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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)....
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Why do I missing 1090 Rebroadcast Traffic (ADS-R) Targets from Ground Station as part of 978 Uplink?

For context I have an ADS-B 1090 OUT and 978 IN. I also have a Stratus portable Dual channel receiver in my plane, so I have the option of comparing the traffic between systems. What I’ve been ...
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423 views

What are the radius of containment (Rc) and horizontal protection limit (HPL) and how are they related to Type Code?

In ICAO Document 9871 (Technical Provisions for Mode S Services and Extended Squitter) page 30 they have mentioned it in the form of a table. But they haven't explained HPL and Rc in detail.
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285 views

What is the difference between ICAO and non-ICAO flight address?

In document 260B, "Minimum operational performance standards for 1090Mhz Extended Squitter", on page 47 of the pdf, in the DF18 format they have mentioned for a particular CF(code format), "non-ICAO ...
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741 views

What accuracy is required in todays ADS-B position reporting?

I would like to know what accuracy is required for ADS-B position reporting. For example, mobile phones A-GPS capable have 10 meter position error with perfect conditions. Is this similar with ADS-...
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Why doesn't ADS-B use satcoms like ADS-C?

With ADS-C, in the middle of remote areas (like ocean), we can send position report via satellite data link. So, why ADS-B systems on airplane uses ground based stations (VHF datalink) rather than ...
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426 views

ADS-B receiver, dongle vs SBS-3 or Garmin

Is there any differences between FlightAware Pro Stick USB and Kinetic SBS-3 or Garmin for aircraft tracking purpose? Something like: SBS-3 can receive twice more data.. is there any benefits? Assume, ...
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501 views

What is the unit for ground speed reported by ADS-B?

Strangely enough, I'm having trouble finding the unit reported by ADS-B on the Internet. Many sites simply refer to it as "ground speed". Is it measured in KPH?
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Can an ADS-B In/Out equipped aircraft increase ground station coverage? [duplicate]

Suppose a ground station can detect aircraft in a 200 km radius with ADS-B In. There is a plane A at 180 km, and another one B at 250 km, both equipped with ADS-B In/Out. If ground station receives A,...
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352 views

How to know that ADS-B position messages are not spaced more then the 1/2 zone limit?

I am doing some ADS-B compact position reporting (CPR) decoding at the moment and one of the things that is described is; "1/2 zone limit" from the last successfully decoded message. I understand ...