Questions tagged [surveillance]

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19 votes
1 answer
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Identifying WWII reconnaissance plane wing

Between 1944 and 1945, a US Photo Reconnaissance Squadron or (or something alike) did a survey of the whole Chilean territory using the Trimetrogon camera system (228 rolls of film and about 49.000 ...
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6 votes
1 answer
175 views

Why bits are mixed up (interleaved) during ATC transponder mode A and mode C reply format?

In the image above from radartutorial.eu, we can see that the sequence of bits are c1 a1 c2 a2 c4 a4 during the reply of ATC transponder mode A. Why are the bits not transmitted like c1 c2 c4 then a1 ...
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1 vote
0 answers
90 views

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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  • 137
7 votes
1 answer
630 views

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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1 vote
1 answer
79 views

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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  • 137
1 vote
1 answer
316 views

How did the USS Vincennes misidentify an Airbus aircraft? [closed]

Wikipedia indicates that the USS Vincennes misidentified Iran Air Flight 655: Crucially, Vincennes misidentified an Iran Air Airbus A300 civilian airliner, Iran Air Flight 655, as an attacking F-...
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  • 333
2 votes
2 answers
2k views

Is a Mode C or S Transponder a type of Mode 3 Transponder?

Mode A transponders are sometimes referred to as Mode 3/A transponders. According to NATO STANAG 4193 (not publicly available, summary from Wikipedia), the "3" in that description refers to the mode ...
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3 votes
3 answers
1k 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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6 votes
2 answers
498 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-...
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  • 309
0 votes
1 answer
193 views

What were DJI drones spying on? What data did they capture? [closed]

In late 2017, it was claimed that DJI (a very popular Chinese drone company) was working with the Chinese government to spy on the United States via their drones, or their drone controllers, which are ...
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4 votes
0 answers
172 views

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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3 votes
0 answers
114 views

Are ASR and PAR approaches commonly used in Europe?

How common are ASR and PAR approaches these days? Are they still practiced anywhere in Europe?
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3 votes
1 answer
435 views

Why were these Hawkeyes flying in a circular pattern?

A couple of months ago I was near the Wallops Flight Facility in Virginia, when I saw 3 or 4 planes flying in a tight circular pattern. The planes were on the larger side, prop driven and had large ...
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3 votes
2 answers
2k views

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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  • 33
4 votes
3 answers
809 views

What aircraft would have these tail numbers?

Last night I was looking at a flight radar on my phone, and I saw two blips flying close to each other over Camden, NJ. They were heading northeast at around 250 knots, and the only information ...
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19 votes
4 answers
8k views

How are aircraft separated in a non-radar environment?

In remote areas that have no radar (oceanic airspace, etc.) how is aircraft separation maintained so that airplanes don't get too close? What do areas that normally have radar do when there is a ...
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