Re: GPS receiver with Raw Data Measurements

If you're willing to do some soldering, you should consider OEM
receiver boards. Both the Antaris ($119 from www.u-blox.com) and the
Thales AC12 ($149 from www.navtechgps.com) have very good carrier phase
data. These are raw circuit boards and you have to hook up your own USB
interface. It is pretty easy if you use one of the standard USB modules
($19 from www.sparkfun.com.) and a Radio Shack prototype board.

For a ready-to-go solution, look at the Antaris LEA-4T evaluation kit.
At $350 it is not inexpensive, but it is almost as sensitive as the
Sirf III and has quality measurements. At a more reasonable price, the
Sirf II and Garmin Gps18 provide raw measurements, though I hear they
are not as precise as the Antaris and AC12.

The Sirf III chip does NOT provide carrier phase. (bummer)

I've written software to talk to these various receivers, but things
aren't working well at the moment. You're welcome to look at what I
have so far at www.precision-gps.org. My work schedule is easing up, so
I may have a chance to get back to it.

- john

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