Innovative Methods to Design Dual Frequency GPS Receiver Antenna
M. Chandra Sekhar
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Innovative Methods to Design Dual Frequency GPS Receiver Antenna

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The GPS is modern satellite based navigation system developed and maintained by the U.S Department of Defence (DoD). The present GPS system transmits navigation signals at two frequencies L1 and L2. The data transmitted on the L2 carrier is in the encrypted form so it cannot be accessed by civilians. The position accuracy of the GPS depends on various errors due to ionospheric delay. Unavailability of two signals in clear form to civilians has limitation on position accuracy due to ionospheric delay. Error due to ionospheric delay can be estimated if the two signals at different frequencies ar...