Cairol wo habe ich denn bitte schön den Sirf2 Chip erwähnt oder genannt?
ich habe wenn dann an den Lea 4-T gedacht und der ist nunmal genauer (mit der entsprechenden Software dahinter).
OEM Receiver Boards (1-2 cm)

These GPS receivers are intended to be incorporated into other devices. You can't buy them at the local store, but you can order them online from the manufacturer or a special distributor. They are raw circuit boards. You have to provide power, a USB or RS232 interface, and a box. You might have to solder cables. (Note that Kinematic can currently only do 20-50cm positions.)
*Thales AC12.
*u-blox Antaris and *Antaris LEA-4T. (The "T" is important.)
Furuno GT8032.
ITrax 03
Superstar II with the right options.
Allstar, a discontinued version of Superstar
Motorola Oncore, an older receiver.

Some of these receivers give 5 or 10 Hz updates, which would be very useful for dynamic situations (say monitoring a race car or guiding a model aircraft).

"Raw" Consumer Grade Receivers (20-50cm)

Consumer grade receivers are widely available, often at a very low price. Most are complete and ready-to-use, although some are boards intended for the consumer market. While these receivers provide phase measurements, the measurements are generally not good enough to calculate a "fixed" solution. Still, they can be coaxed into providing good "float" positions at a very low cost.
*Sirf II. (Note: Sirf III does not provide carrier phase.)
*Garmin GPS18usb.
Other Garmin units. There is a free Garmin-->Rinex converter available.
*Trimble Lassen IQ. Does not provide phase, but the Doppler measurement can be integrated to provide "phase-like" information. (to be verified)
Quelle: http://www.precision-gps.org/Hardware.htm