Modulation constellation analysis of GNSS signal using SDR receiver

Modulation analysis is a dispensable item for the quality evaluating of GNSS signal. Tradition method based on instruments is limited to process signal with low dynamic although its accuracy is very high. This paper proposes a new method for modulation constellation analysis using GNSS software defined radio(SDR) receiver, which makes good use of the tracking module of SDR receiver to accommodate signal with great dynamic. The experiment results demonstrate the similarity between the accuracy of this method and that of instruments, as well as adaptability for signal with different dynamic.