71–80 of 205 posts
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Wouldn't the WiFi and Bluetooth beacons provide more accurate and more granular points of data than polling GPS for this purpose?
That would require calibration (this is the layout of the store, the receiver is here, reflections can occur here and so on) while a GPS system would allow owners to just connect to a centralized app and bam, here is where all your visitors walked for the last 3 months.
Crowd-sourced list of Android phones that support dual-frequency GPS: https://docs.google.com/spreadsheets/d/1jXtRCoEnnFNWj6_oFlVW...
Earlier quoted context omitted.
That would require calibration (this is the layout of the store, the receiver is here, reflections can occur here and so on) while a GPS system would allow owners to just connect to a centralized app and bam, here is where all your visitors walked for the last 3 months.
wow, that's your retort/sales pitch for GPS only tracking? it truly needs some work.
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GPS assumes* light travels in a straight line, which it doesn't due to atmospheric effects and reflections off buildings. L5 is a second frequency from the same satellites, which is affected by these problems differently, so the chip can compare the differences between the two signals and guess what's up with the atmosphere and buildings / throw out the dumber looking signal. It's also mostly independent so it's more…
The single frequency situation isn't all that bad though since there are a dozen satellites in view and tracked even in urban outdoor environments.
Crowd-sourced list of Android phones that support dual-frequency GPS: https://docs.google.com/spreadsheets/d/1jXtRCoEnnFNWj6_oFlVW...
Are there any phones that average readings from GPS, GLONASS, and GALILEO together for better accuracy?
Additionally, Beidou is still banned and blocked in firmware while in US even though the satellites are broadcasting, since this constellation lacks US approval (partially because the other constellations are 1-way systems broadcasting to receiver and Beidou is a two-way system, that can be used for tracking and likely emergency response). Here's some slides about BeiDou's technical details, specifically note the 2-way messaging since all anyone's been talking about is Spacex/Globalstar: https://www.gps.gov/cgsic/meetings/2020/geng.pdf
Crowd-sourced list of Android phones that support dual-frequency GPS: https://docs.google.com/spreadsheets/d/1jXtRCoEnnFNWj6_oFlVW...
Are there any phones that average readings from GPS, GLONASS, and GALILEO together for better accuracy?
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I though the Apple Watch had its own GPS and used that for signal?
It does have it’s own GPS. But if it tethered with your phone, it uses that instead to save battery life. The same is true for cellular Apple Watches.
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5m is within the design spec of L1 GPS, so you’re getting it as designed. GPS was never designed to be mm level accurate. The new L5 frequency aims for 30cm accuracy.
> GPS was never designed to be mm level accurate Kind of. Consumer/public GPS was never to be that accurate. Galileo for example, has the following accuracy: 1 metre (public), 1 cm (encrypted) I'm sure the same applies to other systems too.
Garmin has recently released several watches with it as well, both their high end models and some more affordable ones. They also have an auto mode that switches it on or off depending on if the current environment needs it, to save power when you can have the same accuracy without it.
Personally, I find the accuracy and sensitivity of modern GNSS devices amazing. I remember when you had to wait maybe 10 minutes to acquire a fix, the accuracy was poor and maybe within 10 meters, and if you covered the receiver with clothing you would lose satellite fix. Now my phone gets a good position in a few seconds, I can see which side of the road I ran on, and even with my phone in my pocket I can often get a reasonably accurate track indoors.
https://www.androidauthority.com/dual-frequency-gps-878169/
https://play.google.com/store/apps/details?id=com.android.gp...