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10. ACTIVE ANTENNA CONSIDERATION
External Survey Grade Helix
For RTK application, the active antenna must be able to provide signal over 37dB under open sky.
Antennas vary in price, from under $50 to over $300; they mainly differ in interference rejection
capability, multipath rejection capability, antenna phase center stability, and weight. Usually more
expensive antenna claims to have superior interference and multipath rejection capability. Phase
center of expensive survey grade antenna remains constant as the azimuth and elevation angle of the
satellites change; signal reception is unaffected by the rotation of the antenna or satellite elevation.
Helix antennas are expensive mostly due to light weight feature for UAV applications.
Under open sky no interference no multipath environments, performance difference between the
wide price range of antennas may not be much. Depending on budget and application environment
signal conditions, user can choose appropriate antenna for the required application.
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