SiRFstarIII breaks new ground with its incredible signal crunching power (x1000 that of SiRFstarII) that allows it to "correlate" signals that were previously unusable. As a result, performance is more predictable regardless of the environment, for instance, you no longer need to wait to get a fix before driving out of a parking garage, whether you wait or not, the fix won't take more than 45 seconds when it could take several minutes with SS2 if you got started right away
(потерял откуда)
With its rapid time-to-first-fix and high sensitivity, the SiRFstarIII architecture is designed to meet the rigorous demands of wireless and handheld LBS applications, and provides superior location performance, both indoors and out, for 2G, 2.5G, 3G asynchronous networks.
The SiRFstarIII architecture packs a performance punch, achieving time-to-first-fix of one second for aided starts in outdoor GSM environments and acquiring signals down to -159 dBm. This makes real-time navigation practical, including in many indoor environments, through urban canyons, and under 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.
The SiRFstarIII family is comprised of the GRF3w RF IC, the GSP3f digital section, and the GSW3 software that is API compatible with GSW2 and SiRFLoc.
http://www.sirf.com/products-ss3.html
