Hey SparkFun, are you folks planning on updating your [Copernicus DIP Module with the Copernicus II? The II is pin-compatible with the I; it just adds Vbat, which isn’t required (but should probably be tied to VCC). That pin is brought out with the breakout board anyhow. I’ve extracted some of the critical stats from the [Copernicus I and [Copernicus II spec sheets:
I II
freq 1 1 Hz
power 31 44 mA (3.0V)
track -152 -160 dBm
aquis -142 -144* dBm
hot 9 8** s
warm 35 35 s
cold 39 38 s
PPS +/-50 +/-350 ns
horiz <3 <2.5 m (50% of the time)
90% <8 <5 m
alt <10 <5 m (50% of the time)
90% <16 <8 m
* -148 dBm if hotstart with emphemeris
** 3s with battery backup
If SFE won’t be supplying the Copernicus II anytime soon, would I be able to order two Copernicus DIP boards populated with everything but the GPS module?
I’m working on implementing differential GPS by buying two identical modules and using one as a base station. The Copernicus series modules have the option to output 64-bit floating point lat/long, while NMEA output generally has resolution on the order of ~24cm (calculated at 34deg latitude, by taking the distance between a point and the point with both lat and long incremented by the smallest amount possible). What I’m hoping is that 64-bit floating point values will give me much better resolution than standard NMEA output and even better resolution than devices which output 32-bit signed integers scaled by 1e-7 (resultant resolution: 1.44cm). Note that I’ll be subtracting the coordinates I obtain from both units at a given time step, which should remove ephemeris and atmospheric propagation errors. The units will generally be within a km of each other, so I’m hoping to get sub-cm accuracy & precision.](http://trl.trimble.com/docushare/dsweb/Get/Document-501977/022542-012D_63530_00_Copernicus-II_DS_0211_US.pdf)](http://trl.trimble.com/docushare/dsweb/Get/Document-446384/Copernicus_DS.pdf)](Copernicus DIP Module - GPS-08146 - SparkFun Electronics)