Abstract
Adaptive array antenna systems have been widely used for GPS receivers for antenna beamforming and nulling. However the conventional technique requires several analog-to-digital-converter (ADC) and digital signal processing paths to achieve high performance GPS tracks in interference rich environments. This paper describes a new technique for a digital adaptive antenna, which uses a frequency division multiplexing (FDM) receiver to distribute the GPS signals from antenna elements on different parts of the spectrum so that a single ADC can capture the entire five channels. The digital signal is the fed to five digital downconverters, providing the five pairs (I/Q) of signal for digital adaptive array processing. This technique uses less components, thereby lowering cost. The challenge is to develop a high sampling rate and high performance ADC to support the interference environment and still be suitable for GPS application.
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