Has anybody got a good felling about this sub meter accuracy gps.... it's pricey... Is it a waste?
I figure it could help with keeping a stable waypoint fix.
G.
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On ArduPilot Mega code (for airplanes) we now have nice command line interface (CLI) to control logfiles etc many other functions. These same features will be available on ArduCopter. It just takes awhile untill we can start adding more fancy features on ArduCopter. Also with rather small modifications even current code can start control camera gimbal and other camera mounts that can compensate tilt/pan/yaw movements.
Even logging time can be done to memory. It's just matter of programming issues what to log and how to use gyro outputs :)
Compensating those movements are done by onboard gyros and because we use gyro output already, it will be really easy to use their output for other things too.
I personally don't see any real reasons to get that expensive GPS. If you want to have higher update rate than what MTEK provides, I've just tested new uBlox LEAH 6 chips and we got really good update rates and accuracy with that. Downside is that those new GPSes are not our yet so it will take awhile untill we have them.
It you let us know a bit more about your application, maybe we can point towards right direction.
If you read the notes at the end of all the marketing blurb - and it becomes clear that the sub-meter accuracy referred to is subject to certain conditions - as it is with most modern day GPS modules with half decent firmware and onboard filter config i.e. it is capable of sub-meter accuracy, not that you will get sub-meter. accuracy. GPS accuracy can only ever be as accurate as the L/L2 downlink timings are - and they are subject to all the usual multi-path problems that stem from the condition of the atmosphere they have to travel through
Notes
1. SVs > 5, HDOP < 2, short baseline from reference station, and low multipath environment.
2. Dependant upon ionospheric activity and multipath
Add RTK and now you can achieve sub-1" accuracy and sub-2" repeatibility! (95% of the time - the rest of the time it will drift a couple inch either way) - ask any John Deere tractor driver who has StarFire/RTK GPS system on his tractor.
G.
The GPS fix is a big one for me....