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gpspassion

94154 Posts

Posted - 26 janv. 2006 :  02:00:30  Show Profile  Visit gpspassion's Homepage  Reply with Quote
UPDATED 20090301

Mio A701 : 1. "synthetic" (SIF only) Warm Fix 2. "Mixed Fix" -> details

News Item on the portal
The idea behind "Offline AGPS" (or "AGPS over the internet") is straightforward but effective : instead of downloading the ephemeris data from the satellites, something that takes 30 seconds at best, requires a good signal level (>28 dB-Hz) and needs to be done every 4 hours, you download a 50kb ephemeris file valid for 3/7/10 days. Acquisition time in the morning goes down to 10 seconds from 40 seconds in good environments and remains at 20/30 seconds on average in challenging environments (coated windshield, dense urban environment) versus several minutes, if at all possible, without AGPS.

When you turn on your AGPS enabled GPS receiver, synthetic ephemeris data is used first and then there is a gradual switch to live ephemeris data as it becomes available (30 seconds in a perfect environment). Once live data has been downloaded it is valid for about 4 hours and it gets updated continually, but if you turn off your receiver for 4 hours, then you start from scratch again.

LIST OF COMPATIBLES DEVICES - December 5th, 2008
  • Globallocate's LTO :
    • GPS PDAPhones : HP hw6515 and HP hw6915 - GL20000 chipset

    • AIOs : TomTom ONE v3/v4, TomTom ONE XL v1/v2 - Hammerhead chipset - review

  • Nemerix's NeX : no systems so far


  • Qualcomm gpsOneXTRA (see PDF documentation) : 40Kb file valid for 7 days, provides for very fast warm TTFF, about 8 seconds with a good view of the sky and as low as 20 seconds in dense urban environments, as tested on the HTC TyTn II - see topic for more details.
    Also on Samsung i780, HTC Touch Cruise, HTC Touch Diamond


  • SiRF's SiRFInstantFix v1 :
    • GPS PDAs : Fujitsu N560

    • GPS PDAPhones : Asus P750, Eten G500/X500/X500+/X800/X600/X650/M700/M800/M810, HTC P3300/X7500, Mio A701/A501/A702

    • AIOs : Asus R300/R700, TomTom ONE v1/v2a, TomTom GO x10/x20/x20/x30/x40, Dash Express

  • MTK v2 (MTK 3329) company site : iBlue 747A+, Qstarz Q1000X, Qstarz Nano - Bluetooth GPS dataloggers

  • Skytraq AGPS : Wonderpoud BT100Y and BT760Y - Bluetooth GPS receivers - see this topic

  • uBlox AssistNow® Offline : no systems so far



Updated September 2007 : Skytraq AGPS available on Wondeproud Bluetooth receivers, more details >> here <<

Updated March 2007 : NemeriX launched NeX in February at 3GSM, more details >> below <<

Updated January 17th, 2007 : 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 canyons, 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. uBlox chipsets are not currently used on consumer GPS systems, but their SuperSense enabled Antaris 4 will power Navigon's upcoming Porsche Design 9611 AIO.

Updated June 14th - SIF (SiRFInstantFix) that works wonders on the Mio A701 as Globallocate's LTO does on the HP hw6515 will also become available on the Eten G500 via a ROM upgrade (see below) during the summer. At the 3GSM show, Fujitsu also mentioned SIF for the Loox T830 announced for this summer as well. On the other hand, TomTom is still showing it as being "available soon" although the GO x10 series have been available for a couple of months now. Let's stay tuned for more...

Updated 05/23/2006
According to their website and based on testing of the shipping x10 series, TomTom has postponed the launch of QuickFix.

SIF is deployed on the Mio A701 GPSPDAPhone though, see the review for more details.


Updated 03/10

Yet another system applet ? No, because Quick Position lets you download the SiRF ephemeris data, and can remind you to update too


At the end of January, SiRF announced SiRFInstantFix (SIF), an AGPS over the internet solution to speed up the first time to fix and in some cases make it possible, like Globallocate's does on the HP hw6515. We now have some more information about it:
  • There is no planned upgrade path for existing SiRFstarIII based systems unfortunately

  • First PDAPhone with SIF: Mio A701 with "Quick Position"

  • First AIO with SIF: TomTom 510/710 and 910, with "QuickLocate"

  • The TomTom .ee file weighs about 57Kb for a 7 days lifespan

  • On the SiRF simulators at the 3GSM show, a "warm" fix took about 13 seconds with SIF vs 40 withough it.

  • Unlike Globallocate's solution that can get a fix without satellite time, SIF, needs at least one satellite in view with a decent level of signal (142dBm) to get the time. According to SiRF this is achievable in almost all environments.


  • I'm looking forward to the first live testing with either the Mio A701 or the new TomTom 910 to see how it improves the user experience as much as Globallocate's LTO on the 6515.


    [Updated 02/08
    Activity is clearly ramping up in the field of A-GPS over the internet with the recent announcement by u-Blox of their own solution. After Globallocate's LTO implemented on the HP hw6515 (see the full review), SiRF's announcement of SiRFInstantFix, this is the third A-GPS via the internet solution that relies on the prediction of ephemeris data to make the initial "fix" nearly instantaneous. This makes sense as live ephemeris downloading has now become the most time-consuming element (30 seconds) with powerful chipsets that can compute a fix very quickly once that hurdle has been overcome. The only consumer solution currently based on a uBlox chipset is Socket's V2 Bluetooth GPS.

    Posted 01/26
    Hot off the wire, SiRF have just announced the launch of SiRFInstantFix, a "unique service that minimizes the start-up wait time for GPS systems. SiRFInstantFix provides consumers with the ability to turn on their SiRF-based navigation devices and achieve the first fix in as fast as eight seconds...SiRFInstantFix eliminates the initial time-consuming task of obtaining precise GPS satellite location data -- ephemerides -- from the satellites themselves. Instead, the SiRFInstantFix server uses a sophisticated set of proprietary algorithms to predict seven days of ephemerides and distills them down to a small file which SiRF-based navigation systems can use to pinpoint every GPS satellite".

    Not that it's related, but it seems my wish of seeing a GPS solution combining the power of SiRFstarIII (tracking down to 14dBhz or -159dBm) and the LTO (Long Term Orbit) technology of Globallocate (website), first used on a consumer device on the HP hw6515, to overcome the physical requirement of a minimum and uninterrupted signal level from the satellite of 28dBhz to download ephemeris data, is about to come true. Great news for the end user, although one has to wonder how SiRFInstantFix will play along with Globallocate's LTO/"Extended Ephemeris" patents that seem to cover this field. The PR does not mention any cooperation between the two companies.

    According to the PR, SiRFInstantFix is "available now", but it is not clear if and which current SiRFstarIII based devices can benefit from it or whether an upgrade will be required or available.

    Here is a real life example of the impact of using stored ephemeris data, the other day I couldn't get a fix with my SS3 based RBT-2010 waiting for my plane to take off to update my position on my tracking server because my ephemeris data was outdated (> 5 hours) and the signal level was below 28dBhz, meaning no fresh ephemeris data download, so I took out my 6515 and it was able to get a fix thanks to the data stored in its memory. What's appealing with SiRFIII is that it can track down to 14dBhz while I haven't seen the 6515 go below 22/23 dBhz.


    On the left the SiRFstarIII RBT-2010 sees 11 satellites but signal level is too low to download ephemerides, so no fix
    On the right the Globallocate 6515 sees fewer satellites but relied on its stored ephemeris data to get a fix
    Reported dBhz levels can vary but tests done within a few seconds

    We'll have to see how low a SiRFIII GPS can get a fix with SiRFInstantFix, probably won't be as low as 14dBhz, but it's bound to be a massive improvement compared with the current 28dBhz, even if it's say 20dBhz that would mean getting a fix with signal that is 6 times weaker.

    Questions, comments ?
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    rancho1

    354 Posts

    Posted - 26 janv. 2006 :  02:54:33  Show Profile  Reply with Quote
    It says you need to connect to "InstantFix Servers" to download the files.
    So, your GPS device has to have internet access and rely on access to servers that need to be maintained by a third party and may go up and down periodically? And they plan to provide these servers forever for free?
    Is the data for all gps satellites in North America and Europe going to be available in these downloaded files?

    Edited by - rancho1 on 26 janv. 2006 02:58:25
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    gpspassion

    94154 Posts

    Posted - 26 janv. 2006 :  03:08:58  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Well the good thing about the ephemeris data is that it is the same worldwide and yes you would have to download that data onto your GPS as HP hw6515 owners already via QuickConnect by connecting to Globallocate's servers.

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    rancho1

    354 Posts

    Posted - 26 janv. 2006 :  06:37:38  Show Profile  Reply with Quote
    Having to manually download files from their servers and then install them on the GPS weekly is clunky and not user-friendly. It will be a turn-off for people wanting a seamless experience.
    Too bad it cannot automatically download and save the info into ROM directly from the satellites.
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    gpspassion

    94154 Posts

    Posted - 26 janv. 2006 :  09:59:09  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Well that's what it does for live ephemeris data, you mean have the satellites send the 7 day predictions ? That wouldn't be possible as the transmit speed is very slow at 50bps.

    It depends on the device of course, with a PDAPhone like the 6515 it's really easy and even with a PDA, just drop it on the cradle at night and it will likely sync automatically. Downloading that data is not a requirement for current GPS based SiRFstarIII receivers to work so people who enjoy the improved TTFF can use it and others can pass, but the ability to get a warm/cold fix almost anywhere should make it worthwhile in my opinion, see the example I added above.
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    Sam Ontario

    USA
    169 Posts

    Posted - 27 janv. 2006 :  15:10:14  Show Profile  Reply with Quote
    How about with PDA maintained on and put into the AC charger with GPS Receiver on all the time at the window, thereby, the GPS signal is updated all the time. We, therefore, don't need the SiRFInstantFix.

    However, just a thought over my head, it will be nice if there is a programme/software within a GPS navigation software to calculate the locations/orbits of all satellites with respect to the PDA present time and the last time tracked satellite locations. When the PDA is switch on or the navigation application is activated, the appropriate satellites are tracked immediately (say within a few seconds) and received updated signals thereby reducing the cold fixing time. Is it feasible?

    Sam
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    gpspassion

    94154 Posts

    Posted - 27 janv. 2006 :  15:21:16  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Sure, if you keep your GPS on at all times it updates the ephemeris data in real time as fresh ones become available, i.e. every 30 minutes. The problem is that this rarely going to be the case. As to calculating the orbits locally, I don't know, but I suspect it might require quite a bit of processing power that is easier to deploy on a server, with the server then feeding the data to clients.

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    bteasley

    USA
    23 Posts

    Posted - 02 févr. 2006 :  05:32:59  Show Profile  Reply with Quote
    Just felt like posting something...

    For the time being, this does not seem all that useful to all that many people. For true enthusiasts (anyone who uses gpspassion)it is interesting and there are some benefits. But as mentioned above, for most users it is not a seemless experience at the moment. For them it won't be worth the hassle.

    However, when a major player with a working network that provides internet access to a device gets this new service working (and the SIRF chips in their 'private labelled' devices)... then they'll have something for the masses.



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    gpspassion

    94154 Posts

    Posted - 08 févr. 2006 :  16:01:40  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Activity is clearly ramping up in the field of A-GPS over the internet with the recent announcement by u-Blox of their own solution. After Globallocate's LTO implemented on the HP hw6515, SiRF's announcement of SiRFInstantFix, this is the third A-GPS via the internet solution that relies on the prediction of ephemeris data to make the initial "fix" nearly instantaneous. This makes sense as live ephemeris downloading has now become the most time-consuming element (30 seconds) with powerful chipsets that can compute a fix very quickly once that hurdle has been overcome. The only consumer solution currently based on a uBlox chipset is Socket's V2 Bluetooth GPS.


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    altden2002

    93 Posts

    Posted - 08 févr. 2006 :  22:28:42  Show Profile  Reply with Quote
    The more the merrier, I say. :)

    I swear I have seen it somewhere that Globallocate and Sirf used to partner together - Globallocate was producing the quartz or some other timing thing that Sirf used. Now that I googe it I can't find it. Weird.

    At any rate I see an ugly lawsuit between Sirf and Globallocate in the future. Let's hope it does not turn into another RIM/NTP kind of ugly :(


    Edited by - altden2002 on 08 févr. 2006 22:32:06
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    gpspassion

    94154 Posts

    Posted - 08 févr. 2006 :  23:57:36  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Dunno, if uBlox are coming out with their own solution, maybe they are considering this is a "public" concept, time will tell, I do hope legal issues don't prevent us from enjoying this breakthrough technology.

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    akribie

    United Kingdom
    4 Posts

    Posted - 05 mars 2006 :  19:28:19  Show Profile  Reply with Quote
    InstantFix sounds like a useful facility for SIRFIII users, but not if we can't get hold of it!

    Any hints on how to access the download/update system (I have a Mio A201)?
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    gpspassion

    94154 Posts

    Posted - 05 mars 2006 :  19:31:26  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Yes, very useful, unfortunately it doesn't look like there will be an upgrade path at this point...The first IF capable unit should be the Mio A701.

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    gpspassion

    94154 Posts

    Posted - 10 mars 2006 :  23:55:34  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    First message updated with some new information about "SIF".

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    Adams

    Poland
    5 Posts

    Posted - 11 mars 2006 :  02:12:34  Show Profile  Visit Adams's Homepage  Reply with Quote
    And what about this InstantFix one...? :-)
    http://www.xaiox.com/instantfix.htm


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    gpspassion

    94154 Posts

    Posted - 11 mars 2006 :  02:33:01  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    hum...totally unrelated of course, no AGPS there, wonder if they took the name before or after though ;-)

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    gpspassion

    94154 Posts

    Posted - 23 mai 2006 :  22:40:02  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    According to their website and based on testing of the shipping x10 series, TomTom has postponed the launch of QuickFix.

    SIF is deployed on the Mio A701 GPSPDAPhone though, see the review for more details.


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    Oki

    Spain
    19 Posts

    Posted - 04 juil. 2006 :  13:13:39  Show Profile  Visit Oki's Homepage  Reply with Quote
    Dear ETEN G500 users,

    097 ROM for eten G500 is out and supports SIF. Direct Download here:
    http://www.eten.ru/support/files/ETEN_G500_WWE_R11_101_0097EE.zip

    You may need also the GPS firmaware update:
    http://www.eten.ru/support/files/G500_GPS_firmware_update.zip.

    I can not test those files since I have a Mitac Mio A701.

    The page where I took those links from is:http://www.eten.ru/support/files.php?type=rom

    Cheers!
    Oki

    EDIT: you can find mo info and and comment about ETEN G500 ROM at:
    http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=51409&whichpage=4#347839

    Edited by - Oki on 04 juil. 2006 13:26:25
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    Oki

    Spain
    19 Posts

    Posted - 04 juil. 2006 :  14:02:17  Show Profile  Visit Oki's Homepage  Reply with Quote
    These are, so far, my findings about SIF:

    - SIF works only with COM4 because the ephemeris control algorithm runs in the PDA and not in the GPS, so it requires concurrent access to the SiRFStarIII chipset in order to control it while other GPS application is running.

    - I have seen that Quick Position downloads the file Packedephemeris.ee from Mio and stores it in the \windows folder.

    - When COM4 is opened by any application such as spGPSView, SirfTech or VisualGPSce, the Packedephemeris.ee file disappears and a bigger file is created with the unpacked ephemeris called ephdata.clm in the same folder, \Windows.

    - The registry entries regarding these activities are inside HKEY_LOCAL_MACHINE/Software/EE.

    - Every time the COM4 port is used it opens the unpacked ephemeris data file.

    - If you have a fix, receiving valid ephemerides data from the GPS constellation, then the ephdata.clm file is updated.

    - If you look closer inside the ephdata.clm you will see that it begins with the following string: 1.0-BETA-C1-B022-WinCE-ARM-R. Does this mean that it is in the first stages and we will benefit of the seven days promised by SiRF in future releases?

    - The NMEA SiRF-added messages related to SIF are PSRF107, PSRF108, PSRF151, PSRF152 and PSRF154.

    - I do not know the DLL or service which controls the SIF processes and messages yet.


    - Does SIF works while the protocol is set to Binary SiRF? iGO2006 supports SiRF protocol and it seems to run more fluid when using it. It would be nice having AGPS while iGO2006 is running in Binary SiRF mode.

    If you, the reader, have more information about SiRF or Globallocate (it provides up to 10 days of ephemeris data) then please share it with us. It could be nice having Globallocate working in the A701 too and vice-versa.

    Thanks,
    Oki
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    gpspassion

    94154 Posts

    Posted - 05 juil. 2006 :  15:40:37  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Interesting what you found about the .clm file. Not sure why they update though when there is a fix, maybe to take into account the live data for the next 4 hours, but that could be done directly at GPS module level as with standard receivers.

    I can't see Globallocate's files being compatible with SiRF's files, probably some proprietary coding.

    Based on my testing, we already have the benefit of the 7 days, you can see that if you try a warm reset or turn off your A701 for 4+ hours, it will fix in about 12 seconds with good signal, not possible without SIF.

    I don't think it switches to SiRF binary to use SIF, the fact that iGO works is probably unrelated. There might be some optimization possible if you read the SIRF binary directly but I doubt it would have much of an impact. Back in 2002, Destinator 1 ONLY worked properly in SiRF mode, feels like another lifetime ;-)

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    Oki

    Spain
    19 Posts

    Posted - 06 juil. 2006 :  00:10:40  Show Profile  Visit Oki's Homepage  Reply with Quote
    quote:
    Originally posted by gpspassion

    I can't see Globallocate's files being compatible with SiRF's files, probably some proprietary coding.

    Based on my testing, we already have the benefit of the 7 days, you can see that if you try a warm reset or turn off your A701 for 4+ hours, it will fix in about 12 seconds with good signal, not possible without SIF.

    I suppose that SIF only works if the PDA side of the algorithm matches the GPS side one. This would confirm the ROM upgrade along with a GPS FW upgrade for Eten G500. Globallocate on a SIF devoce can be done, but it would require a lot of programming in order to translate the messages.

    A warm or even a cold start will not delete the almanac but what gappens if you leave the SIF information to expire after the 3rd. day?, in other words, no Quick position undates for more than 3 days. Have you tried not to update the Ephemerides during 4 days?

    Regards,
    Oki
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    gpspassion

    94154 Posts

    Posted - 06 juil. 2006 :  16:03:38  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Yes, that's I was saying in my previous message, you get the benefit of synthetic ephemeris for about 7 days, whether you get a fix or not in the meantime. Clearly the quality of the predictions goes down over time and if there is change to the course of the satellite after you download them you're SOL of course. I think both Mio and HP are being pretty conservative with their 3 days, just got a 5 second fix with the HP hw6515 with the 10 day ephemeris data showing 15 hours left only !

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    Oki

    Spain
    19 Posts

    Posted - 11 juil. 2006 :  12:27:03  Show Profile  Visit Oki's Homepage  Reply with Quote
    It seems that Globallocate AGPS software works in the Mio A701 according to some A701 users. Read here.

    Maybe both systems use the same GPS side algorithm and communication protocol.

    I will try to confirm this.

    regards,
    Oki

    Edited by - Oki on 11 juil. 2006 12:27:49
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    gpspassion

    94154 Posts

    Posted - 11 juil. 2006 :  12:38:38  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Worth trying, but I honestly don't see how that could work. How is the GL software going to be able to connect to the SiRFstarIII module and it's not on the same COM port. I wonder is these guys aren't simply seeing a "hot fix" in action, especially since one of them says he has to download data 2/3 times a day.

    I know you looked at the .ee/.clm files, do they bear any similarity to GL's LTO files ?
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    Oki

    Spain
    19 Posts

    Posted - 11 juil. 2006 :  14:41:22  Show Profile  Visit Oki's Homepage  Reply with Quote
    I have more info about SIF.

    The application involved in all this is \Windows\CLMApp.exe but its original name is CLMTestApp.exe. This application is executed each time the virtual GPS port is opened.
    WinHex utility gives interesting information after a quick overview. It seems that it can be used for monitoring the SIF and general GPS activity. Its main funtions are:
    - To upload the Ephemerides to the GPS
    - To unpacks the downloaded ephemerides data into \Windows\ephdata.clm
    - To keep updated data inside the file \Windows\ephdata.clm.

    It also seems to be able to download the ephemerides data directly from Internet since it have all the strings related to download.

    The quick usage information is:

    Usage: CLMTestApp [-e] -rgps_port [-c] [-m]
    [-a[aux_port]] [-n[tcpip_port]] [-f[log_file]]
    [-sserver_address] [-pserver_port] [-dfile_name]


    It is an interesting starting point for SIF investigation.

    I am goint to do some test with Globallocate, maybe the ephemerides upload to the GPS is performed using the same communication protocol.

    Regards,
    Oki
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    Oki

    Spain
    19 Posts

    Posted - 11 juil. 2006 :  23:33:58  Show Profile  Visit Oki's Homepage  Reply with Quote
    I have just confirmed that Globallocate do NOT work in a Mio A701. Removing the ephemerides files from the \Windows folder takes the SIF away and Globallocate can not do anything.

    About CLMApp, I would like to test the ETEN G500 CLM Application from its last ROM 97EE just for fun. The HW and virtual ports are different in both machines but maybe the application is called from another module of the OS with the right port mappings.

    Regards,
    Oki
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    gpspassion

    94154 Posts

    Posted - 12 juil. 2006 :  03:00:13  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Thanks for the update, makes sense on the lack of compatibility GL/SiRF. There should be fewer compatibility problems between the G500/A701 implementations.

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    aliensquale

    126 Posts

    Posted - 05 oct. 2006 :  23:18:24  Show Profile  Reply with Quote
    can you get Sirf InstantFix to work with a Globalsat BC-337? Is SIF even out yet, I don't see any mention of it on Sirf's website... but it would definately help in my situation because currently I use the gps in my car when I leave in the morning... so it has to do a cold start because it was off all night (more than 4 hours) so the ephermiris data is outdated. Then I get the fix in about 2-5 minutes usually and go to where I need to go that day. Then I am out of my car all day for 8 hours or so, then when I get back in my car I turn on my pda again and again the ephermiris data is out of date since it's been more than 4 hours since my last use of the gps, so again it's doing a cold start and again I have to wait another 2-5 minutes for a fix. It would be great if I could download a file every 7 days and put that on my pda so the gps could use that file when it starts up.
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    gpspassion

    94154 Posts

    Posted - 06 oct. 2006 :  01:35:32  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    No, SIF is only available on GPS PDAPhones for the time being.

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    gpspassion

    94154 Posts

    Posted - 09 oct. 2006 :  14:40:40  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    quote:
    Originally posted by Oki

    The application involved in all this is \Windows\CLMApp.exe but its original name is CLMTestApp.exe. This application is executed each time the virtual GPS port is opened.

    I've come across a new type of SIF implementation on the HTC P3300, not the same as A701/G500 and in fact it seems to be broken at this time with warm starts of 30/35 seconds instead fo 12/15 seconds on the Mio A701. The exe is called QuickGPS now, not CLMapp.exe. How did you figure out the commands for CLMapp.exe, are there tools that can help with that ? Did you see anything about the COM port settings too, COM2/COM4 on the Mio ?

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    gpspassion

    94154 Posts

    Posted - 31 oct. 2006 :  18:09:30  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Well it seems the HTC P3300 still needs some fine tuning.

    SiRFInstantFix is now available on the TomTom GO 510/710/910 with the release of v6.52.

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    gpspassion

    94154 Posts

    Posted - 08 janv. 2007 :  23:44:50  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    TomTom will be using Globallocate's LTO on the Hammerhead based TomTom ONE v3 that was announced today.

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    gpspassion

    94154 Posts

    Posted - 16 janv. 2007 :  23:38:18  Show Profile  Visit gpspassion's Homepage  Reply with Quote


    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

    94154 Posts

    Posted - 23 janv. 2007 :  15:55:17  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    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

    94154 Posts

    Posted - 13 mars 2007 :  12:13:13  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    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

    94154 Posts

    Posted - 13 mars 2007 :  12:15:31  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    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  Show Profile  Reply with Quote
    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

    94154 Posts

    Posted - 14 mars 2007 :  23:18:30  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    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

    Posted - 13 juil. 2007 :  02:59:58  Show Profile  Reply with Quote
    I don't know if this has been discussed but u-blox is now offering their AssistNow® A-GPS services free.

    http://www.u-blox.com/news/free_assistnow.html

    Clock + Sextant + Charts = GPS System
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    gpspassion

    94154 Posts

    Posted - 13 juil. 2007 :  06:19:47  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Saw that announcement, but I'm not sure what's different from January ? I guess it was in beta at the time.

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    gpspassion

    94154 Posts

    Posted - 07 sept. 2007 :  03:31:02  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    "On-Board" A-GPS, i.e. no need to connect to the internet, is set to debut on the new iPaq 314, more about it here http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=96776 courtesy of Centrality's "Autonomy".

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    gpspassion

    94154 Posts

    Posted - 12 sept. 2007 :  02:12:22  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Feels a bit lonely here ;-)

    Updated September 2007 : Skytraq AGPS available on Wondeproud Bluetooth receivers, more details >> here <<

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    gpspassion

    94154 Posts

    Posted - 20 sept. 2007 :  20:04:33  Show Profile  Visit gpspassion's Homepage  Reply with Quote
  • 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  Show Profile  Reply with Quote
    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

    -------------------------------------------------------------------------------------------
    4700,5550,3970;BT-338,10Deluxe,Brodit Active;TomTom5,AutoMapa (PL),GPMapa (PL)
    [/quote]
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    gpspassion

    94154 Posts

    Posted - 01 nov. 2007 :  15:11:28  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    You need to load the ephemeris file specifically in the app, second menu if meomory serves.

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    eginko

    2 Posts

    Posted - 01 nov. 2007 :  15:35:10  Show Profile  Reply with Quote
    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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    rybshik

    Canada
    6 Posts

    Posted - 01 mars 2009 :  17:04:00  Show Profile  Reply with Quote
    Hello,

    Please recommend a good stand-alone GPS receiver with USB interface.

    Thanks.

    Dell Axim X5, Axim X51V

    Edited by - rybshik on 01 mars 2009 17:04:56
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    discord

    3 Posts

    Posted - 20 mars 2011 :  02:01:51  Show Profile  Reply with Quote
    Are all MTK v2 (MTK 3329) devices AGPS compatible? I noticed some MTK v2 (MTK 3329) based dataloggers have no mention of AGPS in their product manuals. Do 3rd party tools such as bt747 allow MTK v2 (MTK 3329) based dataloggers to upload AGPS data? Where do you aquire AGPS satellite data. I'm new to the GPS devlopments of the last 10 years.
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    gpspassion

    94154 Posts

    Posted - 20 mars 2011 :  02:38:57  Show Profile  Visit gpspassion's Homepage  Reply with Quote
    Welcome to the forums.

    Must admit I stopped worrying about AGPS on my dataloggers a while ago ;-) Good question though, but I'd suggest reposting it in the topic dedicated to the MTK chipset -> http://www.gpspassion.com/forumsen/topic.asp?topic_id=81990

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