- Joined
- Jan 18, 2009
- Messages
- 3,172
- Reaction score
- 1,383
Last I looked - and it's been a few years - the MEMS couldn't match the stability (normal G) and output purity of true XTALs.
The reasoning was based on an actual flight this summer.John, can you provide anymore specifics or reasoning on that? Is this assuming a UBLOX M9N? I recall last year you mentioned the acceleration limitations can be improved with using satellites on the oblique (non overhead) to reduce the doppler freq change rate the module has to deal with - so is it safe to assume a better antenna opens out a wider angle of available sats? Also, with a "proper" antenna, are we looking for better gain or better filtering or both?
TP
I still have the log file but I haven't done the analysis you suggested, which is a good one. Often I forget the step to analyze the data to figure out why something worked.... ;-).Very interesting John. Did you capture all the GNSS data or enough to post process to determine the position of the satellites that remained in lock? ie. were/are you able to verify the ones that stayed in lock were low or close to the horizon? This feedback/advice is priceless - thanks!
TP
Hey Troy, not sure how much it'll help but this post got me to dig up my TeleGPS eeprom file from my MD L flight at the last Thunda and export it to CSV. You can see the results below. I took the liberty of deleting columns and rows that weren't very valuable imo.Very interesting John. Did you capture all the GNSS data or enough to post process to determine the position of the satellites that remained in lock? ie. were/are you able to verify the ones that stayed in lock were low or close to the horizon? This feedback/advice is priceless - thanks!
TP
Drew, that's also very interesting and quite helpful. That's one heck of an aggressive fight profile! Very interesting that you maintained lock with 4 sats through the eyeball-pulling phase. You don't by any chance have the NMEA GPGSV data for that flight? That would be really interesting to see what satellites held lock. Any special antenna used?
Enter your email address to join: