Wikipedia:Reference desk/Archives/Science/2020 April 16

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April 16

Aviation / ADS-B / which parameters are sent?

Hi! I believe, I heard in 2015, that todays airplanes transmit their intended flight level via radio frequencies, that everybody could "hear" and then decode. E. g.: The plane is at 30000ft and the pilot configures the flight computer to 20000ft and then the plane sends to the ground "<time stamp> <airline specific parameter id> <value>". Is it true? I cant find that in Automatic dependent surveillance – broadcast. Is it used now for quality assurance, so that pilots, who are too far off, win a flower pot, so that they can see how beautiful the world can be? Thx. Bye. --Homer Landskirty (talk) 14:39, 16 April 2020 (UTC)

ADSB (Automatic dependent surveillance – broadcast) sends a periodic message that provides actual position, velocity and time but, at present not pilot intent. DroneB (talk) 17:58, 16 April 2020 (UTC)

hmmm... ohoh... and ACARS? or was it fake news? they said FlightRadar24.com saw it, too... and that every airline uses its own id and scaling (e.g.: 0 meant 100ft for D-AIPX)... --Homer Landskirty (talk) 18:23, 16 April 2020 (UTC)

A few things have changed with respect to ADSB since 2015 - especially in the United States. Most prominently, the very-heavily-advertised January 1 2020 deadline has long passed; and nearly all aircraft in the United States National Airspace System now require operational ADS-B equipment when flying in "most controlled airspace". Those who need to know these things... should already know these things; and if they didn't get the memo yet, ... somebody with authority has almost surely found them by now.

Here's a few highlights from FAA's website:

• Automatic Dependent Surveillance-Broadcast (ADS-B) - a general overview
• Equip ADS-B - information for aircraft owners and operators
• Information on ADS-B Capabilities
  • ADS-B In and ADS-B Out, including TIS-B, FIS-B, ADS-R, and related technologies
  • Resources, including easy links to the relevant regulations, TSOs, and technical papers; and statements of policy

Like many aspects of aerospace engineering, the technical details of the technology that we lump together as "ADS-B" can become quite complicated. So it's really important to think about formulating your question more specifically. Are you looking for engineering resources? Legal or regulatory guidance? Information for pilots? Information for mechanics? Information for aircraft owners? Information for aeronautical or engineering students? Information for HAM-radio enthusiasts? Information for people (pilots, operators, ...) who are not in the United States? ... There are a lot of different communities who have stake in this kind of thing - and while it's very thoroughly documented, it can be hard to navigate - so let us know if we can point you to a more appropriate source.

And if you're just looking to waste time while hanging around indoors, may I recommend that you take advantage of all this free-time to start memorizing the FARs in preparation for some future day when you might want to accomplish a checkride? I guarantee that no matter how much free time you have, there are enough FARs to fill them...

Nimur (talk) 18:24, 16 April 2020 (UTC)

actually i look for proof, that it is not my delusion, when i say, that those engineers at my university r insane... my psychiatrists always say, that i am insane, although they never even spoke with those engineers (one even told me that a professor warned him, not to be too radical, because radicals just hurt, if they get to much... he always intrigued and lied IMO...)... i mean: if they talk about engineers in general, then one example should be reason enough, to reconsider the diagnosis/medication they gave me... --Homer Landskirty (talk) 18:55, 16 April 2020 (UTC)

there r the findings of flightradar24: [1]... looks like they received the config of the autopilot... right? --Homer Landskirty (talk) 18:41, 16 April 2020 (UTC)

tele video on camera phone

for shooting video on camera phone, can the rear tele camera be used? reviews only discuss video on the main camera. this is on phones with a designated tele camera, like the Realme 6 Pro. thanks! --RM — Preceding unsigned comment added by 14.194.233.88 (talk) 22:04, 16 April 2020 (UTC)

Most reviews on phones I read discuss both front and rear cameras. Certainly both can be used for video. --OuroborosCobra (talk) 02:00, 17 April 2020 (UTC)

I believe that our questioner is asking if phones with multiple cameras on the rear are able to take video from all of them. For instance, the specifications for the aforementioned Realme 6 indicate that is has four rear facing cameras:

64 MP, f/1.8, 26mm (wide), 1/1.72", 0.8µm, PDAF

8 MP, f/2.3, 13mm (ultrawide), 1/4.0", 1.12µm

2 MP, f/2.4, 22mm (macro), 1/5.0", 1.75µm

2 MP B/W, f/2.4, (depth)

but does not indicate which can record video, saying only:

2160@30fps, 1080p@30/60/120fps, gyro-EIS

-- ToE 13:31, 17 April 2020 (UTC)

I don't know why this is on the science desk. But I can say that my Huawei P30 can record video from any of the 3 rear cameras. While multiple rear cameras are starting to get more common, I would be surprised if here is any phone that is flawed enough that it cannot record video from any normal rear camera. (Specialist cameras like depth ones may be more complicated although they are probably sometimes used for video, as opposed to recording video.) I would suggest a more careful look at the review would probably reveal if it can record using all rear cameras at least if it's a decent review. E.g. if screenshots show the option on the camera app when recording video, or if review discusses how each camera performs at video. The review may also have samples of video from the different camera. Nil Einne (talk) 22:58, 17 April 2020 (UTC)

As I claimed see e.g. this review for the Realme 6 [2] which does discuss video of both the ultrawide and wide cameras. To be fair it also strongly implies the macro camera cannot be used for video, but that's sort of a specialist camera even if it can be used directly for photos, so this isn't that surprising. Note that this review also demonstrates the point I was trying to make. The video quality can vary quite a bit depending on the camera used. So any decent review should look at the different cameras. (Although it does look like the review failed to look at video for the front camera. An interesting omission in this time of lockdowns in many places including India.) Nil Einne (talk) 23:04, 17 April 2020 (UTC)

thanks! --RM