Windows Mobile smartphone sports single-chip GPS

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Jun. 07, 2006

Fujitsu Siemens has incorporated a single-chip version of SiRF's flagship SiRFstarIII GPS receiver into its Pocket Loox T Series smartphones, the company announced on June 7. SiRF's new GSC3f single-chip GPS receiver has over 200,000 correlators and can track 20 satellites at once, SiRF says.

Fujitsu in February debuted the Pocket Loox T (shown at right), a Windows Mobile handheld that combines the functions of 3G UMTS phone, PDA, still and video cameras, MP3 player, and GPS navigation. The device also boasts the combination of both WiFi and Bluetooth wireless, a QWERTY keyboard, and Microsoft Direct Push email support.

Single-chip GPS

According to SiRF, the GSC3f delivers exceptional sensitivity and extremely fast time to first fix (TTFF). The chip's SiRFstarIII architecture is able to track more than 20 satellites, and that it can achieve a remarkable TTFF of one second for aided starts in outdoor GSM environments and acquires signals down to -159 dBm, making real-time navigation practical in challenging environments such as urban canyons and dense foliage.

Unlike the lengthy sequential search process of traditional GPS architectures, the SiRFstarIII architecture, with the equivalent of more than 200,000 correlators, enables fast and deep GPS signal search capabilities, resulting in significant improvement over today's architectures that contain a few hundred to a few thousand correlators, SiRF claims.

GSC3f system architecture
(Click image to enlarge)
According to SiRF, the GSC3f comes in a compact, 7 x 10 mm BGA (ball grid array) package that combines:

A complete A-GPS digital baseband processor
An RF front end
An ARM7TDMI CPU "to enable user tasks"
1 megabit of battery-backed SRAM
4 megabits of flash memory
2 UARTS
A high speed serial bus
10 general-purpose digital I/O lines

Additionally, according to the company, patented SiRFLoc location technology allows networks to move beyond basic "find and locate" applications to support a wide range of location-based services (LBS) such as navigation and real-time routing with minimal network bandwidth requirements.

Fujitsu Siemens did not disclose precisely which Loox T models currently include, or will incorporate, the single-chip GSC3f.

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