Abstract
Digital Beam Forming (DBF) and nulling are viable means of GPS array signal processing that enable multipath mitigation and provide protection against interference. However, as reported in the literature, nulling causes errors in the carrier phase and code phase measurements. Unlike single element GPS antennas (Fixed reception pattern antennas - FRPA's), multi element antenna arrays (Controlled Reception Pattern Antennas - CRPA's) exhibit significant distortions in their phase patterns. Correction for known anomalies in the individual element patterns mitigates the carrier phase error. Part of the carrier phase error arising from the application of non-trivial complex weights, implemented as part of the nulling action, can be compensated for in the carrier phase tracking and measurement domain in the baseband GPS receiver processing. Such an approach enabled by the use of a SW defined GPS radio will be demonstrated in the paper with results to support the theory.
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