Why is the satellite range restricted to a meter? Are the mobiles not capable of better accuracy or is it the limitation of the satellite?
Turn your phone into a space monitoring tool
51–60 of 92 posts
Re: Turn your phone into a space monitoring tool
#52Why is the satellite range restricted to a meter? Are the mobiles not capable of better accuracy or is it the limitation of the satellite?
The get higher accuracy requires more precise hardware / additional hardware on the receiving end which drastically drives up the cost.
Systems like this [1] which you may have seen being used on construction sites allow much higher accuracy.
Re: Turn your phone into a space monitoring tool
#53Why is the satellite range restricted to a meter? Are the mobiles not capable of better accuracy or is it the limitation of the satellite?
The get higher accuracy requires more precise hardware / additional hardware on the receiving end which drastically drives up the cost. Systems like this [1] which you may have seen being used on construction sites allow much higher accuracy. [1] https://en.wikipedia.org/wiki/Differential_GPS
Is it possible to get close to centimetre accuracy without using ground stations like DGPS?
Would you get finer resolution if a GPS receiver also used an atomic clock?
I thought this was interesting - https://www.gps.gov/systems/gps/performance/accuracy/#differ... the difference between military GPS and civilian GPS sounds like it uses 2 frequencies.
Re: Turn your phone into a space monitoring tool
#54A small personal note: I totally favor scientific crowd-experiment, but ONLY if done in FLOSS and public terms. SmartPhones these days are surveillance devices maintained and paid by the formal owner while they serve far more their vendor and other player behind, with the formal owner as the last in the pyramid. In that sense I have to refuse because I have to refuse the device used even by a formally FLOSS and publi…
it’s fairly hard to find research participants
Anything "new" and "that demand a substantial social change" is hard, at least for start and for a not so short period of time... If no one start change never happen, if someone start...
Re: Turn your phone into a space monitoring tool
#55Earlier quoted context omitted.
The get higher accuracy requires more precise hardware / additional hardware on the receiving end which drastically drives up the cost. Systems like this [1] which you may have seen being used on construction sites allow much higher accuracy. [1] https://en.wikipedia.org/wiki/Differential_GPS
Is it possible to get close to centimetre accuracy without using ground stations like DGPS? Would you get finer resolution if a GPS receiver also used an atomic clock? I thought this was interesting - https://www.gps.gov/systems/gps/performance/accuracy/#differ... the difference between military GPS and civilian GPS sounds like it uses 2 frequencies.
Effectively the problem is that the atmosphere (mostly ionosphere) distorts the ranges a bit. Different frequencies distort differently so you can use data from two to compensate.
IIRC, used to work in a gps accuracy firm many many years ago
Re: Turn your phone into a space monitoring tool
#56This reminds me of something I read long ago when I was just a child. A computer magazine had a project where you used an FM radio, a computer probably a Commodore, and a plotter (who had one of those?!). The FM signal could detect meteor strikes in the atmosphere, you wrote a bit of code, the plotter mapped the strikes.
Re: Turn your phone into a space monitoring tool
#57A small personal note: I totally favor scientific crowd-experiment, but ONLY if done in FLOSS and public terms. SmartPhones these days are surveillance devices maintained and paid by the formal owner while they serve far more their vendor and other player behind, with the formal owner as the last in the pyramid. In that sense I have to refuse because I have to refuse the device used even by a formally FLOSS and publi…
This is why Nokia was gutted. Sony phones with Sailfish is the furthest separation you can achieve from the freaks responsible for this situation and still remain a participant in the information age.
People don't understand the cruelty we have grown accustomed to.
Re: Turn your phone into a space monitoring tool
#58If you really want to get low-level data (past what the GPS status apps give you) Google built their own GNSS logger for android: https://play.google.com/store/apps/details?id=com.google.and... I recommend turning on Force Full GNSS measurements in android developer settings if you're going to try messing with it.
Interesting, I'm wondering why they didn't even mention this availability in their website, I would have turned on that setting just to farm more data for their app.
Re: Turn your phone into a space monitoring tool
#59The fact that they can use the delay of the satellite signal to predict rainfall, is pretty impressive. It immediately links this app to more data for weather prediction, which might lead to better weather predictions. I wonder how they would measure that on an android phone. Does android expose such low-level delays to the user? Is this not handled by a GNSS chip in hardware, or the OS driver/kernel?
Here is an example of pretty stunning amount of visual detail provided by one of popular GPS data app on Android: https://play-lh.googleusercontent.com/lT3TpHarUx89Z7HIf043aU... At least I can confirm it works will all navigation constellations on Samsung S10.
I had a lot of fun with that gps status app when I first got a smart phone - you could hold your phone up to the window while flying (to get gps signal) and see the 630mph or whatever speed you were going.
Re: Turn your phone into a space monitoring tool
#60Earlier quoted context omitted.
That's great for monitoring & setting up shots but still doesn't show up as a native device. What I usually do is hook a stream upto OBS or join via video on the phone & stay muted+silent on my laptop.
>still doesn't show up as a native device Yeah it does. You send it to a v4l2 loopback (scrcpy --v4l2-sink) and then it shows up in stuff like Firefox or chrome as a webcam.
Oh nice, will try it out with a clean camera feed probably from some WebRTC sample page.