Comments on: Dear Nokia: Check out this GPS chip that works indoors http://www.intomobile.com/2007/02/01/dear-nokia-check-out-this-gps-chip-that-works-indoors.html Cell Phone News, Information, and Analysis Wed, 25 Nov 2009 22:02:56 -0600 http://wordpress.org/?v=abc hourly 1 By: Jeff Huang http://www.intomobile.com/2007/02/01/dear-nokia-check-out-this-gps-chip-that-works-indoors.html/comment-page-1/#comment-11591 Jeff Huang Mon, 19 Feb 2007 01:06:29 +0000 http://www.intomobile.com/2007/02/01/dear-nokia-check-out-this-gps-chip-that-works-indoors.html#comment-11591 Typically G-Mouse or Bluetooth type of GPS receiver has better performance than Smart-Phone embedded GPS and Personal Navigator Devices. This is due to much higher interference within those devices. Although ublox5 is touting 50 channel 1 million correlator -160dBm sensitivity design, it might not perform significantly better than the SiRFstarIII. There are many unstated conditions for the "1M correlator", "-160dBm sensitivity" to be valid; wich is normally not clearly stated in their marketing announcements. With no common test standards, the GPS specification listed by chipset manufacturers is becoming quite useless. Ones needs to actually test GPS receivers using a particular chipset in order to fully understand its performance. Typically G-Mouse or Bluetooth type of GPS receiver has better performance than Smart-Phone embedded GPS and Personal Navigator Devices. This is due to much higher interference within those devices.

Although ublox5 is touting 50 channel 1 million correlator -160dBm sensitivity design, it might not perform significantly better than the SiRFstarIII. There are many unstated conditions for the “1M correlator”, “-160dBm sensitivity” to be valid; wich is normally not clearly stated in their marketing announcements.

With no common test standards, the GPS specification listed by chipset manufacturers is becoming quite useless. Ones needs to actually test GPS receivers using a particular chipset in order to fully understand its performance.

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