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<div><span class="gmail_quote">On 7/6/06, <b class="gmail_sendername">Christopher Schmidt</b> <<a href="mailto:crschmidt@crschmidt.net">crschmidt@crschmidt.net</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On Thu, Jul 06, 2006 at 09:59:28AM +0100, Jon Stockill wrote:<br>> Nick Black wrote:<br>><br>> >RE GSM/Sirf II - I stand corrected! I've emailed Sirf to see what they
<br>> >have to say about it, but it does seem to mean that the chips *can* be<br>> >used with GSM signals. I don't think that this is A-GPS though.<br>><br>> ISTR there's a requirement in the USA for newer 3G phones to be able to
<br>> provide a position when an emergency call is made - this could be why<br>> the manufacturers are pushing this chipset, since it actually has a<br>> chance of being able to provide a fix while indoors. When used in this
<br>> way it's not unreasonable to assume that the GSM cell data will be used<br>> to help with GPS positioning.<br><br>As far as I know, the requirements for location are only triangulation<br>based, under the E911 legislation, and have been completed for several
<br>years.</blockquote>
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<div><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: EN-GB; mso-bidi-language: AR-SA">E911 legislation originally required that from October 2001, all wireless service providers in the
USA should be able to locate a user with an accuracy of 100m in 67% of cases and 300m for 95% of cases. The method used was not specified - triangulation, dead-reckoning, GNSS etc were all good. A-GPS (GPS reception augmented by correction signals broadcast via GSM towers) emerged as the front runner.
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<div><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: EN-GB; mso-bidi-language: AR-SA"></span> </div>
<div><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: EN-GB; mso-bidi-language: AR-SA">Chris: Has this now been implemented in the US? Six months ago it was going to be six months until the E112 legislation came into force and we all had A-GPS enabled cell phones in Europe. Very little sign so far...
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<div><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: EN-GB; mso-bidi-language: AR-SA"></span> </div>
<div><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: EN-GB; mso-bidi-language: AR-SA"><span style="mso-spacerun: yes">
Nick</span></span></div><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">--<br>Christopher Schmidt<br>Web Developer<br><br>_______________________________________________<br>talk mailing list
<br><a href="mailto:talk@openstreetmap.org">talk@openstreetmap.org</a><br><a href="http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk">http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk</a><br></blockquote>
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