Database Develop

Assisted GPS

Is this function in our Kaiser? I've enable it from the Kaiser Tweak but today i tested it when i was in a tunnel....it did not work at all and the tunnel was 4 KM long....it should have had enough time to get a fix if it was working.
Is the Assisted GPS what i think it is?

How do you expect to get a GPS fix in a tunnel???
AGPS is basically what the QuickGPS app. does: it downloads sat. data (satellite locations) via a network connection from a server, so that TTF (time to fix) is reduced, since the device doesn´t have to download above data from the satellites themselves - which is slow....
Hope I was not too unclear, doing a search will give you much more and detailed info about how GPS works......and it doesn´t in tunnles....

As mentioned above, the AGPS uses server information (via cellular network) to locate the GPS satellite for a quicker fix and hash conditions. For a 4KM tunnel, I'm sure that your phone would have lost both GPS and network signal.

michi123 said:
How do you expect to get a GPS fix in a tunnel???
AGPS is basically what the QuickGPS app. does: it downloads sat. data (satellite locations) via a network connection from a server, so that TTF (time to fix) is reduced, since the device doesn´t have to download above data from the satellites themselves - which is slow....
Hope I was not too unclear, doing a search will give you much more and detailed info about how GPS works......and it doesn´t in tunnles....
Click to expand...
Click to collapse
Thats correct, there are som applications that tries to estimate where in the tunnel you are when the fix is gone. But I suppose this is a function of the application and not the GPS hardware

I stand partially corrected........ http://en.wikipedia.org/wiki/Assisted_GPS

michi123 said:
How do you expect to get a GPS fix in a tunnel???
AGPS is basically what the QuickGPS app. does: it downloads sat. data (satellite locations) via a network connection from a server, so that TTF (time to fix) is reduced, since the device doesn´t have to download above data from the satellites themselves - which is slow....
Hope I was not too unclear, doing a search will give you much more and detailed info about how GPS works......and it doesn´t in tunnles....
Click to expand...
Click to collapse
Which is why the title is "Assisted GPS".....I've done some search on AGPS and it's suppose to use the cellular to still get a fix when in the tunnel. Well....i read it sometime ago way before Kaiser was out and this was actually one of it's talked about feature in Kaiser. Using the Kaiser Tweak, one can enable this feature but i've tested it today in the tunnel with strong cellular signal, the GPS is dead until i came out of the tunnel.

I guess it also has to be supported by the particular program. Many TomTom PNAs have a dead reckoning mode which shows your position in a tunnel based on your "entry" speed for about 30 seconds, than the position freezes in the tunnel. Now that of course has nothing to do with AGPS, but it´s a way of overcoming temporary signal loss.
Best way would be to have an inertial sensor built into the phone like in fix-mounted car-navs......but then again, that would be overkill....

You have to remember that the Assisted GPS (Cellular network mode) relies on the fact the network itself supports the feature. I know most in the UK don't have it turned on in general use. They only allow it to be used by emergency services and the likes.
Perhaps that's the same in your country?

the_ape said:
You have to remember that the Assisted GPS (Cellular network mode) relies on the fact the network itself supports the feature. I know most in the UK don't have it turned on in general use. They only allow it to be used by emergency services and the likes.
Perhaps that's the same in your country?
Click to expand...
Click to collapse
Probably so.....oh well....it was worth a try
Thanks guys for the input.

[Q] GPS Standalone doubt (Clarification required too)

I know SGS has a lot of issue with GPS. Here's mine. I've cold start and standalone set-up in lbs test mode. Now the problem is it'll lock on to satellites in a matter of 20sec with 15m accuracy only when connected to wi-fi couldn't check for gprs since sgs doesn't save my apn =(. But with wi-fi switched off it doesn't speak to any satellites forget about getting a lock on them. Doubt here is, isn't standalone mode supposed to be GPS working without any data connection of any sort or am I missing something here? Kindly clarify. Also what does MS based and MS assisted mean in the test mode. Checked for GPS with Network Provider selected in test mode. I get accuracy of 3.8km here at my home....
Thanks & Regards

Bump to the top....
Sent from my GT-I9000 using XDA App

I just tested indoors (rainy here) and the SGS did get a lock. I've switched off cellular data and wifi, cleared the AGPS data with "GPS Status", and it took a long time (few minutes) to get a lock.
But that was indoors, where it always takes a bit longer to get a lock.

I tried it outside last evening and it would only see the sat's no lock =|

[Q] could wifi be the problem with samsung captivate's gps issues

anyone else notice that when using the Samsung captivate & navigation that is recommends turning on WiFi. it doesn't make sense, but i notice it makes a huge difference in speeding up satellite connection time with WiFi on.
could this be the issue with the GPS??
please confirm this.
-Alex

This is not a fix. Turning WFi on will help give your phone another source to determine your location. The key thing here is that WiFi cannot determine your location as accurately as GPS can. If you look again, you'll probably see that your phone will "lock" onto your position much faster, but it's probably not going to be accurate enough to be usable.

norcal einstein said:
This is not a fix. Turning WFi on will help give your phone another source to determine your location. The key thing here is that WiFi cannot determine your location as accurately as GPS can. If you look again, you'll probably see that your phone will "lock" onto your position much faster, but it's probably not going to be accurate enough to be usable.
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you must have read the title before i edited it.
im not using the WiFi as a location source since i don't have any WiFi internet on the road.
but i notice that the GPS locks on quicker than without the Wifi on.
my nexus one never suggest to turn on WiFi when using navigation

Its not necessarily wifi based location but it can use wifi to download gps data. For a date lock. Its just a suggestion, I don't see why out would make a difference with out a wifi signal.
I prefer to not have network location or sensor aiding enabled. Sensor aiding really doesn't work. Made my my tracks results erratic. Network location gets me within 2 miles, not exactly good for navigation, having it on only allow something to fall back on of you lose gps signal but the whole process of the phone switching from one source to the other and back again takes to long. Keeping network location off forces it to only try to get a gps lock and in my opinion works better.
As far as wifi, if you believe it works better that way then do what every you think helps. It really should only download the data and once it has it it is done with wifi un till it needs new data which usually won't be for several hours.
Sent from my SAMSUNG-SGH-I897

[Q]online gps tracker/navigation(not using direct gps satelite but via data plan)

is this possible? i mean this would be a great advantage for those samsung galaxy s 2.1 gps issue? the online internet provider provide the gps tracking via satelite not our devices. sorry for my bad english. thank u >.

lyrad12 said:
is this possible? i mean this would be a great advantage for those samsung galaxy s 2.1 gps issue? the online internet provider will provide the gps tracking via satelite not our devices. sorry for my bad english. thank u >.<
Click to expand...
Click to collapse
Not sure what you mean.
GPS uses satellites. Phones use data plan to load maps. Some applications like TomTom load 1.5GB of maps on the SD card, but still use GPS chip to talk to satellite. If you don't use GPS you don't use satellites. You can use AGPS that uses cell phone towers, but it is not very accurate.
In summary. If you don't use satellites, you won't be very accurate. You can get basic location, but never use phone for turn by turn navigation.

[Q] WiFi Only GPS Questions

I was curious as to why there is a button in the notifications menu to turn GPS on and off. I started to look in to it and discovered that there is indeed a GPS chip in the wife only version, or there seems to be anyway!
My question is, what does that chip exactly do? Does it only pick up your location? I can't seem to find any places around me with wifi off. I'm assuming that means all the map and location data is delivered over the internet through 3g or wifi. Is there anyway to use my device as I would a regular GPS device? I know it has all the features but can they work through the GPS chip like they do in a GPS device? Or is there anyway to get this to work?

spyderz said:
I was curious as to why there is a button in the notifications menu to turn GPS on and off. I started to look in to it and discovered that there is indeed a GPS chip in the wife only version, or there seems to be anyway!
My question is, what does that chip exactly do? Does it only pick up your location? I can't seem to find any places around me with wifi off. I'm assuming that means all the map and location data is delivered over the internet through 3g or wifi. Is there anyway to use my device as I would a regular GPS device? I know it has all the features but can they work through the GPS chip like they do in a GPS device? Or is there anyway to get this to work?
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Click to collapse
Ok the wifi is mainly just for accessing networks either open or via ssd and password. You can also connected with mobile AP if your mobile has this option.
The GPS on the other-hand is for mapping and location based services like navigation etc (you can use copilot and several other gps based apps with the P1010). Some of these apps will also piggy back any Bluetooth and or wifi connections that are available for further triangulation if needed. So if you have any apps like various weather and navigation then the GPS is required (but also your location can be shared via your wifi and opt in to give this info through google).
Hope this helps

spyderz said:
I was curious as to why there is a button in the notifications menu to turn GPS on and off. I started to look in to it and discovered that there is indeed a GPS chip in the wife only version, or there seems to be anyway!
My question is, what does that chip exactly do? Does it only pick up your location? I can't seem to find any places around me with wifi off. I'm assuming that means all the map and location data is delivered over the internet through 3g or wifi. Is there anyway to use my device as I would a regular GPS device? I know it has all the features but can they work through the GPS chip like they do in a GPS device? Or is there anyway to get this to work?
Click to expand...
Click to collapse
you can find your location via wifi, enable your wifi and turn gps on, you'll find your coordinates, but not that accurate compare to 3g