Setting up the base

Q&A forumCategory: QuestionsSetting up the base
Kaupoi asked 3 months ago

This might be a silly question, but in hookup guide is said:”Do not power the board until the installation is finished. Because once the board is powered, it is very important to not move the GPS/GNSS antenna nor obstruct its visibility from the sky.” Can I test base before I install it to the final position? If yes, do I need to reset base somehow after testing? Would like to test it on ground level first.
Is there any limitation about surrounding temperature? In how cold enviroment can base be used? Can I put antennas to the tin roof, and leave them there around a year, under snow and temperature sometimes under -30°C?

2 Answers
qcyaob answered 3 months ago

To use F9P as a base station, base station position should be set from UBX-CFG-TMODE3.
Survey-in mode, this mode automatically calculate antenna position and broad cast it as a RTCM1005 message.
Fixed Mode, you can mamually set base station position. (You need to survey accurate base station position in some way.)
You can test and change these setting anytime.

clive1 replied 3 months ago

Problem with SURVEY-IN is that it’s not very accurate.
You want to rigidly mount the antenna, I’d recommend a pole so snow/ice do not settle on it or move it, and so it is horizontal and breaks the roof line, figure the receiver is programmed with a 10-15 degree elevation mask. Timing antenna typically have a pointy radome to sloth off snow.

Ardusimple Staff answered 3 months ago

”Do not power the board until the installation is finished. Because once the board is powered, it is very important to not move the GPS/GNSS antenna nor obstruct its visibility from the sky.” Can I test base before I install it to the final position? If yes, do I need to reset base somehow after testing? Would like to test it on ground level first.”
Yes, you can test before. Just make sure you remove the power and power again once it’s in the final installation. If you are going to do such a fixed installation, you might want to consider improving the survey-in target accuracy or use a fixed position if you already know it.
“Is there any limitation about surrounding temperature? In how cold enviroment can base be used? Can I put antennas to the tin roof, and leave them there around a year, under snow and temperature sometimes under -30°C?”
-40 to +85 is OK.

Kaupoi replied 3 months ago

“If you are going to do such a fixed installation, you might want to consider improving the survey-in target accuracy or use a fixed position if you already know it.”
How can I do that?

Ardusimple Staff replied 3 months ago

UBX-CFG-TMODE3. You can monitor with UBX-NAV-SVIN the status.

Kaupoi replied 3 months ago

Ok. This is getting too complicated for me. I think I’ll go with default settings for now. =)