Hi all,
I am using Navigon6 for navigation but while driving in a tunnel navigon says "you have reached the destination" after the tunnel it starts navigating as usual. I now activated "assisted GPS" with the Kaiser Tweak but now? How does it work now? What do I have to do?
Thanks
Michael
micha2802 said:
Hi all,
I am using Navigon6 for navigation but while driving in a tunnel navigon says "you have reached the destination" after the tunnel it starts navigating as usual. I now activated "assisted GPS" with the Kaiser Tweak but now? How does it work now? What do I have to do?
Thanks
Michael
Click to expand...
Click to collapse
You do nothing! Some people say the tweak works and some don't. It seems to have worked for me. I don't lose signal at this road will lots of trees now (I used to lose signal before I had this tweak applied).
Hi, so I tried the Kaiser with activated A-GPS and Navigon6. As I said I had the problem that Navigon gave the message "Destination reached" while driving through a tunnel. I expected that Navigon, because of a signal from A-GPS, won't bring these message. In the first moment I was happy because the Icon didn't turn to red in a tunnel but then there was the message again. But there is another problem, with activated A-GPS there seems to be some kind of signal (icon doesn't turn red) and because of this Navigon doesn't start routing after the tunnel. So it seems that A-GPS doesn't work together at least with Navigon6. Any ideas?
Cheers
Michael
Hi
I expected that Navigon, because of a signal from A-GPS, won't bring these message.
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Click to collapse
As far as I know A-GPS (QuickGPS on Kaiser) is just for getting initial fix for GPS applications. This helps avoid the initial delay in getting your location, after that it will perform exactly the same.
Regards
Phil
Hi Phil,
OK, I understood what A-GPS does but Navigon should proceed navigation after a tunnel (when GPS signal is back) again even A-GPS is turned on or not?
Cheers
Michael
PhilipL said:
Hi
As far as I know A-GPS (QuickGPS on Kaiser) is just for getting initial fix for GPS applications. This helps avoid the initial delay in getting your location, after that it will perform exactly the same.
Regards
Phil
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Click to collapse
PhilipL said:
Hi
As far as I know A-GPS (QuickGPS on Kaiser) is just for getting initial fix for GPS applications. This helps avoid the initial delay in getting your location, after that it will perform exactly the same.
Regards
Phil
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Click to collapse
QuickGPS is indeed a form of Assisted GPS used to quick the initial fix. However, he is talking about the Assisted GPS tweak for use _while_ navigating. It already requires a fix and lets your phone keep on tracking when going through tunnels or when satellite reception is too low. If it works by simple extrapolating direction and speed or uses some sort of GSM tower triangulation technique nobody seems to know. All we know is that the signal doesn't get lost so quickly with it As always with stuff like that, YMMV.
Are we all sure about the definition of "Assisted GPS" - 'cos QuickGPS is not my understanding of it and neither is extrapolating position using GSM tricks when the GPS signal fails.
As far as I am concerned, Assisted GPS is the term to cover a variety of techniques aimed at improving the accuracy of a fix over and above what is possible from just the received satellite signal. WAAS (EGNOS in Europe) is the most common way of doing this but on a device with a built in data connection there are other options. The basic idea is that a variety of factors including interference to the satellite signals as they come through the ionosphere and GPS satellites being out of adjustment can reduce the accuracy of the calculated location. With Assisted GPS, there are a number of base stations dotted around the world at locations which have been very accurately determined by traditional surveying techniques. GPS receivers at each of these locations are continuously calculating their GPS based locations, comparing them with the known, correct location and generating hints in a defined format which other GPS receivers can use to improve the accuracy of their calculations.
The issue then is how to get these hints out in near real-time to the remote GPS receivers. WAAS and EGNOS use dedicated satellites to transmit them back to earth, but these only cover the US and parts of Europe. With a GPS in a mobile phone, you obviously have the possibility of using the data channel to distribute the correction data - a lot cheaper than launching satellites. The EGNOS correction data is already published on their web site - not sure about WAAS - I tend to assume that enabling Assisted GPS on a Kaiser just sets the receiver to downloading the correction data stream off the internet...
Martin
No, that's not Assisted GPS. That's Differential GPS.
Assisted GPS is designed to allow GPS to perform in areas with poor satellite reception, augmenting the fix with information on nearby cell towers (which have known locations and ranges). Also, in most situations, A-GPS also means that the GPS pseudorange processing is offloaded from the phone to the tower (to allow for E911 on phones with insufficient CPU to calculate a GPS fix on their own), but I'm assuming this part of A-GPS is not coming into play here.
Some users from the pocketnavigation forum have the same Problem with the Kaiser/GPS-Chip. It seems to be a really big software/hardware bug.
By loosing the signal in the tunnel the gps chip stops to send any information to the Navigon-software. That's the problem: The required systemtime for further navigation is missing.
So Navigon tells you: You've reached your destination.
Any Firmwareupdates for this Problem?
Greetings
As far as I understood it, QuickGPS is downloading the satellite almanac from the internet, instead of getting it through the GPS. A GPS which has not been turned on for a while will get this almanac even without internet connection, but it takes about 15 minutes to download it (happens automatically in any GPS unit). Getting it from the internet saves you these 15 minutes, but if you have used your GPS recently for more than a 15 minutes period, QuickGPS should not make any difference.
The almananac for the GPS satellites is like a sun or moon almanac, just for satellites instead. This means that if you have a current almanac, and your GPS knows your rough position, then the almanac will tell the GPS where it should expect to see the satellites. This includes which of the satellites are visible on a given position on the earth (roughly around a third of them), and at what azimuth and elevation. GPS satellites are orbiting the Earth in intervals of just under 12 hours in certain orbits, intercepting the Equator at 55 degree angles (which means that they will cross 55 deg North/South when they are closest to either pole). Since they are more than 20000 km out, this is not a problem if you are actually on or close to either pole, but it means that you will not see satellites right above you at either pole. WAAS satellites are geostationary (which means they can only be somewhere over Equator at about 36000 km orbit), and these satellites do not transmit normal position and time information like the other satellites (SVs) in the GPS system, but precision and integrity information. Put in other words, they tell the GPS receiver 1) Is the signal in your area good or bad and 2) What vector to correct your measured position in whatever area your GPS says you are in. Similar for LAAS units, although they differ in being local area only but on the other hand, more precise. LAAS units are called pseudolites, because they act almost like satellites, though they are really not. For aviation, LAAS enables precision auto-landings in "zero weather" for the same reason, but since the LAAS station is on or close to the surface of the Earth, it only works when in line-of-sight of it.
The problem I am experiencing is if I turn my GPS off and move it a couple of hundred of miles and then turn it on again. This is usually when I am flying, and as we all know, the battery of the Kaiser is not really built for powering the unit for very long! When I turn the GPS on after for intance an hour or so, it still assumes the original position, and it will sometimes get a lock on on or two satellites only, trying desparately to maintain that position. Knowing how the GPS satellites interpolates via a time-shifting technique, I can see why this happens, as it gets a false fix. Aviation grade GPS systems will never lock on to anything less than 3 satellites for a 2D fix, and prefers 5 or 6 satellites minimum for integrity reasons (called RAIM).
What I think is the real problem is that these end user GPS systems for road use have to be more sensitive, so they can be used behind shielded windows and poor reception areas in buildings etc. Trees with many leaves can be an issue also, although clouds are no factor in this equation. Sunspots can blind the system completely if they are strong enough, and that is why eLORAN is an update to the LORAN-C system which is currently being considered for backup purposes mainly.
So, my Kaiser and other end user GPS units will be less restrictive for a good quality fix, and accept second guessing the position, where as aviation and other critical uses of GPS have to have a good position.
We need a GPS utility for the Kaiser GPS to carry out a position reset so it can do a new fix.
Hi guys,
OK I understood what A-GPS is but there is still the issue that Navigon really stops Navigation if the signal is lost when A-GPS is turned on.
If A-GPS is turned of there is also the message "destination reached" but after the tunnel it starts navigating again. Any idea on this?
Cheers
Michael
micha2802 said:
Hi guys,
OK I understood what A-GPS is but there is still the issue that Navigon really stops Navigation if the signal is lost when A-GPS is turned on.
If A-GPS is turned of there is also the message "destination reached" but after the tunnel it starts navigating again. Any idea on this?
Cheers
Michael
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Click to collapse
It sounds more like a bug in Navigon more than anything, check for updates on their site.
A-GPS for Mobile devices as said by some in this thread, extrapolates from the last vector information of the GPS using also information of cell location (in some countries this info is not available due to Gov restrictions) and inserts new data available for any app when signal loss is present from the GPS unit, thus reducing the 'Lost satellite reception' on your app. On WM devices, we are not looking directly at the GPS output but at a 'handler' at com4 able to supply GPS information to more than one app at a time. This is where A-GPS and QuickGPS insert their data when needed. A-GPS just directly inserts nomal NMEA data stream whereas QuickGPS sends the latest Ephemeris data it has downloaded for satellites saving the GPS unit wasting time downloading it from the sats themselves at turn on.
It does seem that Navigon can not resume from the handover back to normal data as other apps can. The fact that it even says 'Destination reached' in a tunnel without A-GPS shows an inherent problem!
Hi everyone,
I'm running on the Nav n Go iGO 8 on the PDA Corner Ultimate XV3 (May 7th) with the 1.65.24.36 Radio and iGO is having issues. aGPS is enabled and it is able to acquire satellite signals but then it freezes when i click street name when entering the destination. However, when aGPS is disabled it cannot acquire signal period as if the GPS unit is non-existent.
HELP
A-GPS
Hi
I can't get iGo8 to work with A-GPS enabled unless I start another program that switches the GPS receiver on and wait for a fix. Even then it's buggy and I have to restart the program every now and then. It is useable though. I find that iGo8 works perfectly with A-GPS switched off. Try waiting for a valid GPS fix before starting iGo8.
Cheers
andrew-in-woking
Hello all i have disable agps, gps config to com04. and it wanna fix satellite. he found every time over 10peace. i cant using gps software.
please help.
thanks
make sure you try outside gps don't work indoors
And try to stand still while the device is establishing a satelite connection. Moving can prolong the time needed for a satelite fix.
I just got this phone a few days ago and I'm camping in Maryland now and I've been playing with it. Is the GPS on this thing true standalone GPS or is it track-you-like-a-tagged-animal-thru-the-cell-towers-GPS? The way GPSTest and Google Navigation behave gives me hope it is the better standalone type. Any confirmation?
the SGS is not standalone GPS.. But mine works well and has stopped me from getting lost a few times.
for some is works well for others it dont.
you are one of the lucky ones
Correct my understanding, are u asking that our SGS has gps capability without network signal?
If thats ur question, then the answer is Yes
/nik on MIUI
So I've got one answer for NO and one answer for YES, LOL. So does it or does it not have independent GPS hardware in it?
SGS I9000 has standalone GPS hardware .
It also has A_GPS thats the network/Wifi add on for faster GPS lock etc .
GPS on cold boot no Wifi shows 6 satellites indoors with a 10 m error .
The specifications show it .
Broadcom BCM4751 chipset
The Samsung I9000 Galaxy S comes with a GPS receiver, which got a satellite lock in about three minutes with A-GPS turned off. A-GPS can speed this up quite a bit, but requires Internet access.
jje
Check your model as their are some variants .
GPS test remove sim card turn off wireless .
Delete GPS data .
Get satellite lock or show satellites = GPS hardware as the A_GPS and Network Towers cannot work .
jje
KDOG2020 said:
So I've got one answer for NO and one answer for YES, LOL. So does it or does it not have independent GPS hardware in it?
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Yes it does, at least on the internation version. But as JJEgan said it won't lock on as quickly if you have your WiFi/mobile network turned off, as it would if you had them turned on.