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gpspassion
93427 Posts |
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gpspassion
93427 Posts |
 Posted - 16 janv. 2007 : 23:38:18
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uBlox have just launched AssistNow® Offline - 14 days wirth of orbit predictions.
Nearly a year after SiRF, uBlox are also launching their "AGPS over the internet" solution, called AssistNow® Offline. In the same way as Globallocate's LTO and SIRF's SiRFinstantFix, the idea is to predict the orbit of the GPS satellites to speed up the time to first fix in the morning and in difficult environments (urban canyon, coated windshield, indoors, etc...). They're going one step further though with a lifespan of 14 days versus 10 for Globallocate and 7 for SiRF and there will be a free version and a premium version.
There will be a free version and a premium version, in comparison SiRF's SiRFInstantFix has to be licenced by the manufacturer/system maker.
As can be seen in the sketch above, uBlox refer to "AlmanacPlus Differential", not ephemeris alhtouhg that's what's needed for a fix. I wonder if the term ephemeris was not left out to avoid the "wrath" of Globallocate who recently sued SiRF over SiRFInstantFix.
Let's hope there will soon be systems using AssistNow so we can compare it to LTO and InstantFix. |
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gpspassion
93427 Posts |
Posted - 23 janv. 2007 : 15:55:17
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On a related topic, posted in the sat-nav NG
January 22, 2007
CENTIMETER-LEVEL GPS ORBIT ACCURACY ATTAINED BY NGS
The daily GPS orbit solutions generated by NOAA's National Geodetic Survey
for high-accuracy positioning applications have recently attained
a new level of accuracy, approaching 1 cm. The satellite
ephemerides are generated using a global network of more than 150
stations every day and released within 17 hours. The work is done
in collaboration with other analysis groups of the International GNSS
Service (IGS), which also coordinates the global tracking network.
Over the past year, numerous model upgrades and strategy changes have
been applied in the GPS data analysis bringing the daily RMS orbit
errors down to about 2 cm. On 17 January 2007, the orbits did even
better, at about 1 cm, as a new network strategy was implemented |
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gpspassion
93427 Posts |
Posted - 13 mars 2007 : 12:13:13
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NemeriX launch NeX
NemeriX launched their own extended ephemeris solution at the 3GSM Show in Barcelona in February 2007. I was able to try it on the demo machines and even in the degraded environment of the hall it was able to achieve a Warm TTFF of about 10 seconds, similar performance to LTO and SIF and better than AssistNow (about 20 seconds on the Socket BT GPS). They claim it can work for up to 21 days (SIF is 7 days, LTO 10, AssistNow 14).
The Full PR is on their site.
"NemeriX launches NeX Extended Ephemeris Solution
- Delivers twice the location accuracy of competing solutions
- Time-to-first-fix in less than one-fifth the time
- Innovative implementation allows transmission over a multitude of media
- Offered free as part of the NemeriX GPS solution" |
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gpspassion
93427 Posts |
Posted - 13 mars 2007 : 12:15:31
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SiRF has recently made a new version of the SiRFdemoPPC tool available with support for SiRFinstantFIX and it's interesting because it shows the satellites that use synthetic ephemeris (purple) and those that have live ephemeris (green). Here is an example with a warm fix on the MIO A701 GPS PDAPhone, TTFF happens in 12.1 seconds and after about 20 seconds some live ephemeris data has been downloaded :
Warm Fix -> TTFF : 12.1 --- ~20 seconds --->
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fastbike
United Kingdom
11 Posts |
Posted - 14 mars 2007 : 23:10:14
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quote:
Originally posted by gpspassion
SiRF has recently made a new version of the SiRFdemoPPC tool available with support for SiRFinstantFIX and it's interesting because it shows the satellites that use synthetic ephemeris (purple) and those that have live ephemeris (green).
Ooh, I know this is an obvious question BUT...
How to download, please ? I'm using an ETEN X500 and I'd like to use this.
- Steve |
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gpspassion
93427 Posts |
Posted - 14 mars 2007 : 23:18:30
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Good point, I added the link ;-)
It works on the Eten M700 so the X500 should be ok too. Just make sure to do a "factory reset" when you exit the program as switching back to NMEA put the GPS module in a "loop" and I had to take the battery out for 24 hours to get it back ! |
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vettedude
USA
18 Posts |
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gpspassion
93427 Posts |
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gpspassion
93427 Posts |
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gpspassion
93427 Posts |
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gpspassion
93427 Posts |
Posted - 20 sept. 2007 : 20:04:33
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| Qualcomm : HTC 4550/TyTn II/AT&T 8925/Kaiser - 6 day autonomy - "The GPS Quickstart program comes loaded in the programs folder and it has only 3 settings, 1-Remind Me when data expires, 2-Auto download when data expires, 3-Auto download when connected to a PC via activesync. The prog downloads about 6 days of satellite data from the internet to speed the fix and is basically invisible." - see topic for more details. |
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eginko
2 Posts |
Posted - 01 nov. 2007 : 15:01:56
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Hi!
Can you pls. give me a hint how to setup my A701 to get the "purples"?
I'm using the GSP Settings to choose the hardware port and the program port. I dowloaded the emphersis data, but after the start, I only get blue after a while, no purples.
Where's the problem?
Thanx
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4700,5550,3970;BT-338,10Deluxe,Brodit Active;TomTom5,AutoMapa (PL),GPMapa (PL)
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gpspassion
93427 Posts |
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eginko
2 Posts |
Posted - 01 nov. 2007 : 15:35:10
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Thanx for the quick reply.
But still I cant find the menu to load the file into the app.
But anyway, I dont need to see the Purples, I just want to know hot to set up my device to be able to use SIF. (when it has the ability, why not to use it)
What is the most gentle way to set up virtual COM4? I searched the miousers forum and got a lot of information, from which I am more confused than before...
thank you! |
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