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What type of antenna is used in GPS systems?(a) Yagi antenna(b) Helical array antenna(c) Loop antenna(d) Parabolic antennaI have been asked this question in an international level competition.My doubt stems from NAVSTAR GPS topic in section Satellite Radio Navigation& Inertial Navigation of Avionics

Answer»

Right choice is (b) Helical array antenna

The BEST explanation: The GPS antenna array is formed by an inner quad HELICES encircled by a RING of eight outer helices that provide near equal power to all terrestrial users. The helical antenna is optimum since circular POLARIZATION is least affected by weather and atmosphere.



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