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