Multipath interference limits the speed and accuracy of determining position by "differential" GPS techniques. A geodetic surveyor, for example, requires multipath interference rejection of about 36+20 log/sub 10/ sin /spl epsiv/ dB, where /spl epsiv/ is the elevation angle of the satellite being observed. Signal processing in a GPS receiver cannot satisfy this requirement. A receiving antenna is required that can sufficiently reject signals arriving from below the horizon. Available antennas have inadequate rejection, and brute-force methods of improving them, by enlarging their ground-planes, are impractical. A compact, ground-planeless, dual-band, GPS antenna with improved multipath rejection has been designed and field-tested. This antenna resembles a vertical post rather than a horizontal platter; within its 0.1-m diameter, 0.4-m tall radome is a vertical array of turnstile elements. In field tests, a three-element array antenna rejected multipath better than a 0.5-m diameter ground-plane antenna by an average of 5 dB. A five-element array antenna appears superior to a 0.9-m diameter ground-plane antenna.


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    Title :

    Array antennas for DGPS


    Contributors:

    Published in:

    Publication date :

    1998-12-01


    Size :

    869506 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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