Helix antenna phase center

[Tiago Sá]

Good afternoon guys, I'm trying to implement Piksi as a solution for precision photogrammetry. Currently my prototype is using a helix antenna (Maxtena m1227hct-a2-sma).

The problem is that I can not find the phase center of this antenna documented anywhere. I need this information to be able to calculate the precise positioning in relation to the focus center of the camera.

Can anyone help me solve this?

Kind regards.

Tiago Sá

[jsam...@pobox.com]

On this page, a representative from Maxtenna says to contact them and they will tell you what you need to know:

Helix antenna for a C94-M8P solution?

Page 50 of this PDF mentions phase center of Maxtenna antenna:

[PDF] Antenna Performance Metrics for GNSS - Free Download PDF

In general, does the Maxtenna helix antenna give you good results? What is the price range for those?

Jeff Sampson

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[Tiago Sá]

Thanks for the links jsampson! They're very handy. That's exactly what I needed.

[Tiago Sá]

Sorry Jeff! I was rude. I got distracted by the links and ended up not observing your question.

This antenna is being sold for $ 150 on eBay (https://www.ebay.com/itm/Maxtena-L1-L2-GPS-GLONASS-Wireless-Active-Antenna-M1227HCT-A2-SMA-GNSS-Satellite/183270537789? hash = item2aabc67a3d: g: kUoAAOSwHf5bAL4O)

It is too early to assess the quality of the antenna, because so far I have not performed accuracy tests. In terms of fix rate I am satisfied (but not impressed) with the results obtained so far (~ 70% fix, sparsely populated urban area, PPK, Piksi at 10hz).

I'm not too worried about phase center variation, as I intend to use the same type of antenna on the base and on the aircraft. Which, in theory, should cancel the negative effects of the variation.

In a month I'll have more comprehensive test results. Feel free to keep in touch if you want to know how it goes.

Kind regards.

Tiago Sá

Em quarta-feira, 13 de março de 2019 17:48:09 UTC-3, jsampson escreveu: