Choose GNSS antenna type
For some GIS applications or general data collection, we recommend you choose helix antenna.This kind of field application is less demanding on precision to a few centimeters.
It is difficult to align helix antenna’s phase center to the ground point,so there is also no so-called instrument height.
The unstable grip of the hand may cause an error of about 10-20cm.
Helix antenna is with much more multi-path effect which will greatly reduce the quality of the raw data, thus affecting the accuracy of rtk.
For land survey applications or some high precision cm-level applications, we recommend you choose survey-grade patch antenna.
Also patch antenna have a big ground plane to reduce multi-path effect.
The LNA gain of the antenna is an important technical parameter.
D303 and our EVK requires antenna with LNA gain of 40dB