9
votes
What aircraft would have these tail numbers?
I'm convinced this numbers were fligtradar-internal identifiers, nothing concerning the flights themselves. The following is not an answer, just what I know about flightradar data records and where to ...
- 7,277
8
votes
What's the relation between ADS-B and MODE S
Your questions answered shortly
What's the 1090 ES?
SSR protocol is used to manage transmissions on SSR frequencies (1030 and 1090 MHz). Mode S is a part of this protocol to manage data exchange ...
- 80.9k
8
votes
Accepted
What's required for the ADS-B to function? A GPS or Mode S Transponder?
ADS-B, Automatic Dependent Surveillance - Broadcast, is a broadcast of the aircraft's position and other information.
The position is determined by a GPS receiver. It is possible to use another ...
- 84.5k
7
votes
What aircraft would have these tail numbers?
Aircraft equipped with Mode S transponders transmit a unique 24 bit aircraft ID, in addition to a 4 digit transponder code (squawk). There are two ways of displaying this unique ID, as an 8 digit ...
- 7,504
6
votes
Can ADS-B DF-17 messages with a non-zero remainder after CRC check be used?
Messages with Downlink Format 17 are, as you know, ADS-B messages that do not require interrogation. As such the interrogator ID will be zero.
Frequently you will see that, after applying the CRC ...
- 84.5k
6
votes
Is a Mode S address changed when an aircraft is sold to another country?
A new Mode S address will have to be assigned by the new authority:
Aircraft addresses will be assigned in keeping with the following principles:
[...] when an aircraft changes its State of Registry,...
- 58.3k
6
votes
Why do we need to enter squawk code when mode-s has ICAO 24-bit address?
Mode S was not introduced because of a shortage of Mode A (squawk) codes in congested airspace, but to improve the radar performance.
In congested airspace, a Mode A/C radar suffers from two technical ...
- 84.5k
5
votes
Accepted
N-Number to ADS-B mode s code relationship
In the United States, the ICAO hex code and the tail number are related algorithmically. The code A00001 (in hex, 50000001 in octal) is given to tail number N1, A00002 to N1A, and so on in ...
- 18.2k
4
votes
What is the minimum set of registers to fill for ADS-B?
ADS-B IN systems do require information from the 0x6X registers. These registers hold information like ADS-B protocol version, system design assurance level and position source quality indicators.
...
- 84.5k
4
votes
Accepted
What aircraft would have these tail numbers?
The two aircraft in question were actually only one. Apparently it was a glitch in the FR24 system. It was an Embraer ERJ-190AR, registration number N949UW on flight AA1678 from ATL to LGA.
This ...
- 28.7k
4
votes
Accepted
What benefits does Automatic Dependent Surveillance bring to continental ATC over Mode S?
ADS-B is more accurate. SSR calculates the distance to a target based on when it receives a reply from the transponder, which is inherently imprecise, and calculates the azimuth by the sweep, which ...
- 27.9k
4
votes
Why is a Mode S transponder required to be installed and working for TCAS II to be operational?
Short answer
That's a good question since a TCAS II could send and receive coordination messages using its own transceiver and antennas. Why does it use another mean of communication in the first ...
- 80.9k
3
votes
Why does secondary radar interrogate Mode S or A/C transponders using intermode?
Mode S transponders are designed to be backwards compatible. If you send a mode A/C interrogation like an older radar would, then mode S transponders will respond just like A/C transponders would, ...
- 18.2k
3
votes
What is the difference between RTCA and EUROCAE standardisation?
Yes, EUROCAE and RTCA do work closely together when there is an interest of both European and American industries to standardise something in a certain area.
Typically this would be the case for ...
- 84.5k
3
votes
What's the relation between ADS-B and MODE S
What's the 1090 ES?
1090MHz is the frequency used for replies by Mode A/C/S transponders when they are interrogated on 1030MHz.
ES stands for “Extended Squitter”.
Extended refers to supporting 112-...
- 27.9k
3
votes
Relation between Squawk code and ICAO adress
The ICAO 24-bit aircraft address is encoded in every ADS-B (Downlink Format = 17) message. It is the primary means of associating messages to the same aircraft in ADS-B.
What you have in your question ...
- 84.5k
2
votes
Accepted
What needs to be done when experiencing severe turbulence at an altitude of FL270 with No ATC and Mode C failure?
In case of imminent danger remember these three words: aviate, navigate communicate. In that order.
Aviate: make sure you keep flying the aircraft, and keep it flying in one piece.
Navigate: know ...
- 84.5k
2
votes
What are the radius of containment (Rc) and horizontal protection limit (HPL) and how are they related to Type Code?
Mode S ADS-B messages use DF17 or DF18. The type code field with the DF17/DF18 is set to reflect the current navigation performance.
The Containment Radius (Rc) is the radius that there is a 95% ...
- 20.2k
2
votes
How to extract the interrogator ID from a DF11 message?
Your calculation of $this->_pi just ORs the three parity bytes together,
which certainly doesn't make any sense. I'm not sure what you hope to get out of that. ...
2
votes
Accepted
How to know which data came from Mode S and which came from ADS-B (FIS-B)?
All the recorded transmissions you have, seem to come from the same aircraft. They come all from the onboard (Mode-S) transponder.
All transmission with Downlink Format (DF) 17 are ADS-B. Those with ...
- 84.5k
2
votes
Can ADS-B DF-17 messages with a non-zero remainder after CRC check be used?
According what I could find in Annex 10, DF-17 messages are always supposed to have zero interrogator IDs -- so if you get any of those that don't pass the parity check, they must have been garbled.
...
2
votes
Can you use a mode 3AC interrogator in EU airspace?
Partial answer:
Is the backwards compatibility seamless and simultaneous?
Yes.
Able to reply to both mode S and mode 3 interrogators in real time?
Yes.
Or a toggle switch between modes, in ...
- 4,640
2
votes
How are Mode 2 pulses encoded?
I think the problem is that you see a Mode 3/A (identity) reply, but you try to interpret it as Mode C (altitude reply).
In Mode C, altitude is Gillham encoded, using all pulses except for D1 and X. ...
- 84.5k
2
votes
What is the purpose of MCP/FCU and FMS selecte altitude?
Both are altitude inputs for the autopilot of the aircraft.
The FMS Selected Altitude is the Altitude selected by the Flight Management System (FMS). The FMS hold the flight plan as well as Standard ...
- 84.5k
1
vote
Accepted
What is the unit of the DAP MCP/FCU Selected Altitude as transmitted by the transponder?
It's the altitude in feet or meters, depending on the display setting. It is the value displayed in the MCP - either entered by the pilot or provided from the FMS depending on which is the active nav ...
- 20.2k
1
vote
Why do we need to enter squawk code when mode-s has ICAO 24-bit address?
In some countries, if the equipment codes in the flight plan indicate mode S capability, the computer will assign a squawk code of 1000, which is a special code that causes the transponder to not ...
- 27.9k
1
vote
Does the ATC not receiving Mode C and intermittently other transponder information imply that the Mode S transponder itself has an issue?
Flight Radar 24 and similar websites connect the dots so you won't see short interruptions. ATC would see your on screen symbol change for every interruption and restoration of Mode C signal. Enroute (...
- 2,634
1
vote
How to know which data came from Mode S and which came from ADS-B (FIS-B)?
ADS-B has two defined datalinks, 1090ES and UAT978.
UAT978 is, so far, only available in the US.
FIS-B is weather radar and similar data, and is only available on UAT978.
1090ES datalink is an ...
- 27.9k
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