maemo.org - Talk - View Single Post - Why aGPS in N810, iPhone ?

lardman	2008-09-04 , 13:33
Posts: 2,102 \| Thanked: 1,309 times \| Joined on Sep 2006	#22

I have offered gps solutions for iPhone/Apple (Skyhook)
better, faster, more efficient algorithms for AGPS .

I'm interested in that, do you have any papers published?

size is not an issue - what is a size of aGPS chip in N810, iPhone ?
have you done size comparison ?

No, though you obviously have, what are the relative sizes of the Ti 5300 (iirc) chipset vs any one of the Sirf Star III chipsets (even one of the ones which supports AGPS)?

price is not an issue - Sirf III chip $10 a piece (wholesale price much lower)

<snip>

battery life is not an issue - you can still offer 2 models , one with full GPS and one aGPSed.

By the same token, you have presumably done research on the price and power consumption of the Ti chipset vs one of the Sirf Star III chipsets. I'm certainly interested to see this data.

Think twice.
aGPS was offered for non-gps enabled iPhone by Skyhook
as add-on, not mainstream gps solution.
The idea was great and it worked as it worked.

We've obviously got mixed up between what Skyhook call AGPS (presumably done from a db of cell towers or wifi access points?) and what most people accept is AGPS - namely you need a GPS chipset, one which can at least accept almanac/ephemeris data from an outside source.

Today Apple released gps enabled iPhone and still not full GPS (Sirf III).

The Sirf Star III is not the only GPS out three, it may not be the one you'd like, but as long as it has a working GPS chipset, your statement is misleading.

None of the above listed issues by you is valid.

As I said above, please show us your comparitive studies. I'm certainly very interested in the economics of chipset choice and in the power budget choices.

To me aGPS is still 3-wheel + 1 leg solution for car industry.

I'd have thought AGPS would be one of the last choices for the car industry - cars are not inside very often (at least not while trying to navigate) and will probably have troubles obtaining assistance data anyway. Mobile phone/portable networked devices are more the AGPS target - they are used in poor signal areas and have network connections through which to download the assistance data.

just visit GPS semantic www pages at
http://www.tinyurl.com/iDarius

I looked here and can't find any comparison of the various chipsets, could you give a specific URL please?