Questions tagged [surveillance]
The surveillance tag has no usage guidance.
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What frequencies are used to transmit ADS-B messages?
Presently, ADS-B messages are broadcast on
1090 Mhz Mode S Extended Squitter
VHF Data Link Mode-4 (VDL-4)
Universal Access Transceiver (UAT) 978 Mhz
First 2 Frequencies have relevant ICAO standards ...
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According to which rule, the maritime patrol aircraft are categorized?
Generally, maritime patrol missions are conducted by several types of fixed wing and rotor wing aircraft according to its endurance, capabilities and other features such as weapons, sensors ...
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To what extent is modern "maneuverable spy balloonery" really a thing?
There's a high altitude balloon in the news recently. It seems to have come from the Pacific, passed over Canada and is now over the US. I don't have any official tracking data but notional ...
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Why does secondary surveillance radar use a different antenna design than primary radar?
In radar surveillance we use primary and secondary surveillance radar for different purposes.
I'm wondering about the antenna that use in both system:
Secondary Radar uses an array antenna
Primary ...
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Why do we need to enter squawk code when mode-s has ICAO 24-bit address?
Mode-S transponder was introduced to to eliminate reduced codes available to designate aircraft (4096 squawk codes) in a congested airspace.
With the introduction of mode-S transponders, unique ICAO ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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