I have a ZED-F9P GPS and the idea is to configure it only once, so that we can set it up as a Base in Survey-In mode. This equipment will be taken out into the field, installed, and the configuration cannot be changed. Therefore, I need it to be installed and powered up as soon as it leaves here, and Survey-In mode to start. Once it has fixed its position with the required accuracy and within the configured time, I need the GPS itself to take those coordinates and set them as fixed, so that if it is turned off, it does not start again from 0 in Survey-In mode.
Hi @Pablovs ,
I do not think that is possible. You need to: CFG-TMODE3 with mode set to 1 (Survey-In); let the survey-in complete; optionally read and store the coordinates; then CFG-TMODE3 again with mode set to 2 (Fixed Mode) and provide or maintain the coordinates. Then save the configuration. Only then will it restart in Fixed Mode.
I hope this helps,
Paul
2 Likes
This would need to be automated outside of the ZED-F9P.
ie a Snap-To method which determines rough location, checks against a non-volatile list, and either uses prior survey or initiates a new survey which is recorded/added to the list once complete.
Would require strong repeatability in antenna placement, ie 5/8 bolt in fence or post.
2 Likes
I did something like this for F9R (F9P+IMU). First run with IMU orientation self-determination. At shutdown, store orientation on the SD card. At next startup, orientation is fixed with values from the SD card.
I have a similar situation. The web interface on the express and the base station and the survey model allow you to save commonly used base station locations. They’re accuracy is within about a meter. If you only need exact Rover locations based upon the base station and not their actual exact compass coordinates this will work without all the double checking that you mentioned.
If that doesn’t work I have a solution for you. You could set up a permanent base station and go through all of the notions to find its exact location to the millimeter by recording 24 hours or 12 hours of data and then uploading that via instructions on the SparkFun website. Or you could purchase a one month account from an established ntrip provider like smartnet, topcon, or one point, whatever is in your area. You could then use the spark fun Xpress or base station with internet and connected to the ntrip account as a Rover and get its exact millimeter precise location. Save those numbers and then you could put them in the spark fun equipment in base station mode. If you have 20 different common base station locations you’d have to do this for each one but only once. It would take probably a day to do this or a few hours. Keep in mind that you want to be within about 12 to 15 miles of the base station at most to have the precision you need.
Sorry if this wasn’t perfectly explained but I hope it’s easy to understand
1 Like