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SYMBIAN GPS讨论区(Garmin 4和5教程+官方/MFM地图)
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发表于 20-12-2007 02:33 PM
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发表于 20-12-2007 07:42 PM
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原帖由 quantum^_^ 于 20-12-2007 02:33 PM 发表 
泰国地图很难找
不过
我找到了
我要
几时去泰国? |
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发表于 20-12-2007 08:25 PM
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楼主 |
发表于 21-12-2007 10:45 AM
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和大家分享一下
从malsingmaps和一个网友的帖子
From Wikipedia, the free encyclopedia
(Redirected from A-GPS)
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GPS is a satellite based positioning system. Assisted GPS, or A-GPS was introduced to enhance performance. The development of A-GPS was accelerated by the U.S. FCC's E911 mandate requiring the position of a cell phone to be available to emergency call dispatchers. [1]
Conventional GPS then had difficulty providing reliable positions in poor signal conditions. For example when surrounded by tall buildings (as a result of multipath), or when the satellite signals are weakened by being indoors or under trees. Some newer receivers fare better.
In addition, when first turned on in these conditions, some non-A-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 what 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.
* 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. (See also Wide Area Augmentation System)
Some A-GPS solutions require an active connection to a cell phone (or other data) network to function, in others [2] [3] it simply makes positioning faster and more accurate, but is not required.
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 ran on 386/16 or similar hardware).
High Sensitivity GPS is an allied technology, that addresses some of the same issues in a way that does not require additional infrastructure. It notably cannot provide instant fixes when the phone has been off for some time, that some forms of A-GPS can. |
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楼主 |
发表于 21-12-2007 10:45 AM
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Just my two-cents on A-GPS a.k.a Assisted GPS, A-GPS does work in Malaysia.
Nokia's implementation of A-GPS doesn't require telcos to perform modifications to their transmission towers - instead, just like what the Wiki explains - the phone retrieves fragments of data from any locked on satellites through it's built-in GPS and transmits it via GPRS or 3G to Nokia's GPS Servers for computation. A coordinate of the sender is returned and this usually happens in split seconds.
The first N95 with older firmwares didn't support A-GPS (which among other things contributed to the slow satellite acquisition time) while the latest firmware for the N95 and N95 8GB supports A-GPS. If you've got either, you'd notice a tremendous improvement in acquisition time. It generally takes between 5-10 seconds to lock on.
Please note that with A-GPS enabled, your 3G or GPRS connection will be used. That said, A-GPS usage of your data connection isn't all that great - though it would be recommended that you monitor your phone bill in case you get nasty surprises
Best regards,
Ben |
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发表于 21-12-2007 11:01 AM
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发表于 22-12-2007 08:19 PM
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原帖由 chtan69 于 21-12-2007 11:01 AM 发表 
我是用GarminGPSmap76c的,有五年多了(当年真的好少用者)。前年开始用DopodU1000的MapKing,速度还不错啦,不会很慢.
如果要更多的GPS资讯可以去http://www.gpsinformation.net/看看.
请问你是不是malsingmaps的成员? |
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发表于 24-12-2007 10:19 AM
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原帖由 quantum^_^ 于 22-12-2007 08:19 PM 发表 
请问你是不是malsingmaps的成员?
是,很久前有参与过槟城图的更正。后来就没active了。 |
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发表于 24-12-2007 06:48 PM
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回复 511# 的帖子
原来是前辈  |
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发表于 27-12-2007 12:51 AM
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现在用着 V215
有机会就testing testing一下
不过这次unlock map的方法有点特别 |
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发表于 27-12-2007 02:11 PM
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刚买了nokia n82,如果我想用gps,大家有什么receiver可以介绍?多少钱? |
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发表于 27-12-2007 07:22 PM
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发表于 28-12-2007 02:11 AM
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发表于 28-12-2007 10:09 AM
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我現用N81 好像也有GPS 但我不懂用
要甚麼setting醬的
有誰可以教教我嗎? |
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发表于 28-12-2007 12:34 PM
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原帖由 dannydanny 于 27-12-2007 02:11 PM 发表 
刚买了nokia n82,如果我想用gps,大家有什么receiver可以介绍?多少钱?
n82内建gps,要使用garmin可以购买memorycard 的garmin版本就行了。 |
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发表于 28-12-2007 04:28 PM
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有gps的问题想请教你。
我刚拥有二手的GPS接受器。
我想问如何操作garmin que和update map。
硬件:HP1940 + Holux GPSlim236B
软件:Garmin Que with GPS10 2.9 + GPSGate 2.01
*有些急用*
谢谢。 |
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发表于 28-12-2007 08:16 PM
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发表于 28-12-2007 08:19 PM
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原帖由 dannydanny 于 28-12-2007 02:11 AM 发表 
如果我旧的K800也可以用这garmin吗?
sony ericsson ?
这个好像不能
因为不是symbian / windows mobile
如果java 就不知道 |
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发表于 28-12-2007 08:23 PM
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发表于 28-12-2007 08:51 PM
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quantum^_^ 兄。
请问Malsingmaps怎么样奉献?他写的英文我不太懂。可以解释一下吗?想要用最新的地图。
谢谢。 |
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