APPENDIX F Importance of Antenna Selection
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226
Figure 64: Plot of Good and Poor Antenna Phase Center Variation over Elevation
Angle 0-90°
Many users can accept accuracies of less than a metre so these small phase center vari-
ations cause a negligible amount of position error. But if you require high precision, Real
Time Kinematic (RTK) receivers can achieve position accuracies of 2-4 cm and a few mil-
limetres of phase center error translates to a 10-15% error in reported position. For RTK sur-
vey applications, geodetic grade antennas offer superior PCO/PCV performance.
6. The application
An antenna has to meet the performance, environmental, mechanical, and operational
requirements of the intended application. For example, GNSS antennas used for aviation
applications should ideally be TSO/FAA certified and be rugged enough to handle extreme
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