QUOTE(Pip_X @ Oct 22 2008, 09:01 AM)
1st of all, no matter what super power mower phone you have, 3G AND GPRS WILL induce charges. That is why you have crappy yet expensive data package from Maxis and Celcom.
yes, usage of GPRS will charged according to the amount of data used.
QUOTE(Pip_X @ Oct 22 2008, 09:01 AM)
A(ssisted)GPS and E(nhanced)GPS the same. HP even call it QuickGPS if I not mistaken. They all use data.
well aGPS and eGPS are 'technically' the same thing. eGPS is newer technology and superior than aGPS. QuickGPS is just the software to utilize those technology, it could be name differently by different vendor. here's some insight of both aGPS and eGPS;
aGPS» Click to show Spoiler - click again to hide... «
Conventional GPS has difficulty providing reliable positions in poor signal conditions. For example when surrounded by tall buildings (resulting in multipath), or when the satellite signals are weakened when a GPS device is indoors or under trees. Some newer receivers are better at handling these situations.
In addition, when first turned on in these conditions, some non-assisted GPS units may not be able to download the almanac and ephemeris information from the GPS satellites, rendering them unable to function until a clear signal can be received continuously for up to one minute.
An A-GPS receiver can address these problems in several ways, using an assistance server:
* The assistance server can locate the phone roughly by which cell site it is connected to on the cellular network.
* The assistance server has a good satellite signal, and lots of computation power, so it can compare fragmentary signals relayed to it by cell phones, with the satellite signal it receives directly, and then inform the cell phone or emergency services of the cell phone's position.
* It can supply orbital data for the GPS satellites to the cell phone, enabling the cell phone to lock to the satellites when it otherwise could not, and autonomously calculate its position.
* By having accurate, surveyed coordinates for the cell site towers, it can have better knowledge of ionospheric conditions and other errors affecting the GPS signal than the cell phone alone, enabling more precise calculation of position.
As an additional benefit, it can reduce both the amount of CPU and programming required for a GPS phone by offloading most of the work onto the assistance server. (This is not a large amount for a basic GPS – many early GPSs utilized Intel 80386-class 16MHz CPUs or similar hardware.)
A typical A-GPS-enabled cell phone will use an internet connection to contact the assistance server. Alternatively, it may use standard non-assisted GPS, which is slower and less accurate, but does not lead to network charges for data traffic, which can be considerable.
source : wikipedia
eGPS» Click to show Spoiler - click again to hide... «
Enhanced GPS (or E-GPS, EGPS, trademarked as eGPS) is a technology designed for mobile phones on GSM and W-CDMA networks, to augment GPS signals to deliver faster location fixes, lower cost implementations and reduced power and processing requirements. It is being developed by CSR who has partnered with Motorola – together they intend to create an open industry forum.
According to CSR, EGPS delivers a "universal positioning capability that will not only work reliably indoors and in zero GPS signal conditions, but greatly speed time to fix in poor GPS reception areas where most handsets are used." More specifically, it can "exploit data available from the cellular network to speed GPS fixes and provide complementary, fast, and reliable location sensing when GPS signals are weak or unavailable." CSR is hoping to add eGPS capabilities to handsets for under $1 per unit.
E-GPS combines CSR's "Matrix" technology with GPS – when a user initiates a location request they get a Matrix location instantly using cell tower information, accurate to within 100m. Then CSR's "Fine Time Aiding" helps the device know where to look for a GPS signal, to quickly acquire satellite information within seconds. Fine Time Aiding enables a more aggressive search and is claimed to be equivalent to 6 dB more sensitivity than can be achieved by any GPS hardware correlator in the terminal.
CSR claim that this enables software-only GPS solutions to operate reliably in all environments, and that eGPS is superior to Assisted GPS. EGPS technologies are due in 2008.
source : wikipedia
How QuickGPS works» Click to show Spoiler - click again to hide... «
QuickGPS does not "triangulate" using cellular networks, not even close. Let me start by telling you how a GPS gets a fix on its location, and then explain how QuickGPS offers a shortcut.
The GPS chip receives a synchronized timed signal from the satellites the US DoD launched into orbit. Each satellite uses a different channel. With a good signal from three or more satellite, GPS starts to get a fix. It does this by calculating the time difference between the reception of the different signals, then calculating the relative distances to each of the satellite, then figuring out where it sits in the middle of the satellite.
The GPS calculates four spheres, and its located somewhere on the surface of each of these spheres. There is only one point where these four spheres intersect. That's you.
If you're good at geometry, you might think that it needs 4 satellites to get a fix, but in fact, if the GPS assumes that you are on earth, that provides another sphere, so it only requires 3 satellite to get a decent fix. More adds altitude and accuracy.
But the GPS needs to know where each of the satellite is before it can decide where it is. That information is not calculated, but is available in a detailed download of orbital data provided by the DoD called ephemeris data. It is transmitted...from the satellite to your GPS. For a cold start, your GPS needs to download the entire file, without interruptions in the signal - BEFORE it can even start getting a fix. In fact, the GPS may not even know which channels to tune into, since it doesn't yet know which satellite are currently overhead. This causes a slow first fix.
QuickGPS, is simple. Ephemeris data is passed thru WiFi or cellular data connection ahead of time, and you never have to wait for it to download over the satellite.
...correct me if i'm wrong...
QUOTE(Pip_X @ Oct 22 2008, 09:01 AM)
Please brush up your knowledge, a mod shouldn't be so uninformed like this.
bro, please remove/amend this statement. Being mod is no different like all of us here except his/her duty is to ensure the smooth going of forums they are in charge in and to prevent any conflicts between members from starting. mod have at their discretion a right to moderate any thread that are found to be inappropriate or in violation with board or sub-forum rules.
mod are selected based on responsible postings and substantial contributions on the boards. bro Baronic has proven his time and his enormous contribution in this forum particularly in PDA section! [ maybe bro Baronic make some mistake earlier, but hey...we all do make some mistake right? ]
note : shouldn't this GPS discussion be discuss in the pinned thread?
Oct 22 2008, 10:48 AM
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