Antenna model for PPP

Q&A forumAntenna model for PPP
ALBERTO FALAVIGNA asked 3 months ago

Hello, I have this question: the online positioning services (Es.  NOAA OPUS) ask for the antenna model.
Of course, there is no mine listed among the preloaded ones (ublox ANN-MB-00-00).
Can I indicate a similar one? Which? Have a good day everyone

Ardusimple Staff replied 3 months ago

Hello Alberto,
ANN-MB is not a calibrated antenna, means that the phase center can oscillate from sample to sample and doesn’t have a standard mounting thread, so it’s not suitable for NOAA calibration.

1 Answers
clive1 answered 3 months ago

Each antenna is unique, and while mechanically the construction looks like it can be assembled consistently, it is not tested to meet any specific criterion. The relative phase-centers for each frequency/constellation should be reasonably consistent.
Performance will also be dependent on the ground plane/mount on to which the antenna is attached. The people that robot tested them had a mount plate with a 5/8″-11 thread so it could be fixtured properly.
sourcer32@gmail.com

clive1 replied 3 months ago

Picture of the internals of the ANN-MB
https://portal.u-blox.com/s/contentdocument/0692p000009atfJAAQ
Data for a materially similar antenna AMO builds, see 150 mm (6″) ground plane used to characterize performance/radiation
http://biakom.com/pdf/AGA556022-S0-A14.pdf (close match to MB-ANN, per original sample)
http://biakom.com/pdf/AGA424214-S0-A1.pdf (another using the same patch antenna)