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CSR's SiRFstarIV GSD4t GPS Chipset used in Samsung Galaxy S II
Posté le 25 mai 2011 à 15:01:00 par gpspassion. EN - Hardware
Source :

Updated May 25th, 2011
The SiRFstarIV chipset was first shown by CSR at the MWC show in Barcelona in early 2010 with some impressive demos but had not seemed to gain much traction on the market since. Only the Garmin Forerunner 110 watch was announced as using the chip and it's thought the Blackberry Torch and the TomTom Nike watch use it too, but no digital camera so far. In this context, the Samsung Galaxy S II appears as their first major win.

The highly anticipated Google Android based successor to the Samsung Galaxy S, labeled again as an "iPhone killer", uses the hosted version of the SiRFstarIV chipset, the GSD4t. Given the GPS reception problems of the Galaxy S (although it uses the same Broadcom BCM4751 chip as the iPhone 4 and iPad), people should be impressed with GPS on the SII. You can use the SiRF 2011 Platforms : Prima, AtlasV, SiRFstarIV in the "GPS and Mobile News" forums to discuss.

Updated February 23rd, 2010 - The MWC show in Barcelona last week was a good opportunity for CSR and SiRF to demonstrate the new SiRFstarIV chipset. I was also able to talk to Kanwar Chadha, a SiRF co-founder, and he shared some interesting information on...

... SiRFstarIV that comes in two versions : GSD4t (hosted) and GSD4e (autonomous).

The new chip is not only more frugal but it also benefits from new features that should be very useful for an improved user experience. SiRFGeoRecov can improve the accuracy of a position after the fact (useful for digicams) and SiRFAware constantly updates vital information for the immediate availability of a fix. The demo of SiRFAware was quite impressive in this respect. More details in the SiRF 2010 Platforms : Prima, AtlasIV, SiRFstarIV topic in the "GPS and Mobile News" forums.

Updated July 28th, 2009 - CSR/SiRF have just announced the SiRFstarIV GSD4t architecture specifically designed for general consumer electronics (phones, cameras, gaming consoles, etc...) as it has optimizations for that type of platform : always on, micro power, RF interference "anti-jammer"......

First thoughts: We'll have to see how it performs in the field, but it is certainly very exciting, first with the intrinsic performance of the new GPS engine rated at -163dBm (if the less sensitive -161dBm SiRFAtlasIV engine I started to test, see this comparison, is anyting to go by) and also with the specific enhancements for mobile platforms, an area where GPS performance has been seriously lagging, case in point the Apple iPhone. It's generally accepted that GPS performance on diminutive mobile devices is degraded by a tiny antenna, strong RF interference (i.e. "GPS Jammer") and battery life constraints. With SiRFstarIV GSD4t, SiRF have an answer for all these problems : a powerful GPS engine, an active jammer remover (filters out RF interference to feed "clean" GPS signals to the GPS engine) and advanced power management (SiRFaware) that mimics the standby/talk modes we are used to on mobile phones.

This looks perfect on paper and based on SiRF's track record (SiRFstarII "started" mobile navigation in 2002 and the high-sensitivity SiRFstarIII made GPS "easy" after 2005) there is no reason it won't play out in the field, let's stay tuned for more! In the meantime we can use the SiRF 2009 Platforms : Prima, AtlasIV, SiRFstarIV to discuss.

Posted July 6th, 2009 - It's been nearly 5 years since the breakthrough SiRFstarIII GPS chipset was first shown inside the Leadtek 9553 Bluetooth GPS at ION GNSS 2004 and now the first AIOs based on the new SiRFAtlasIV platform are available, the Takara GP30/53/54 or Navigon 3300/4300 in Europe and the Nextar Q4-MD in the US. In the process we've moved from a "simple" GPS Chipset to a full platform with an ARM11 CPU...

...SiRFAtlasIV is the entry level version of the SiRFPrima platform announced at 3GSM 2008, but the GPS part shares the same specs (vs SS3) : 64 channels (20), 1 million correlators (200,000), -161dBm (-159dBm) sensitiviy, and Galileo compatibility. You can use the First GPS Systems with SiRFAtlasIV shipping of the "GPS and Mobile News" forums to discuss. Stay tuned for some comparison testing with SiRFstarIII, MTK, Globallocate HammerheadII and STMicro Cartesio.

Updated March 18th, 2005 - While the LR9553 was the first SIRFstarIII GPS to be shown (at ION GNSS 2004) it was not the first one to be released, the Globalsat BT-338 beating it to the punch. Still, it is now available at Semsons for $179...... and GpsPasSion Club members get an extra 10% off.

The LR9553 is probably the first "wearable" GPS with it's large clip and diminutive size and form factor, the flipside being a short battery life. More pictures and details >>HERE<< in the forums.

Posted 09/20/04
Thanks to tolvman, for sharing his great find on the Leadtek site: the 9553 Bluetooth GPS that will be remembered as the first GPS receiver sporting SiRF's new SiRFstarIII chipset......PDA GPS receivers were made possible by the arrival of the SiRFStarIIe chipset in early 2002, followed by the IIe/LP (low power) version in late 2002, and then came the XTrac version in early 2003 and more recently the Xtrac 2 version. The SiRFstarIII chipset announced at the 3GSM in Cannes in February of this year offers a drastic power boost aimed at making GPS performance more consistent regardless of the environnement (outdoor, indoor, urban canyon, etc...) comparable to what the current generation offers when given a good view of the sky.

Great news, and a quick analysis of the specs of the 9553 gives some insight into what GPS at the "power of III" will be like! Read about it in this thread of the News section of the forums.

Lu : 25122 | Suite de l'article... ( mots)

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