Implementation of a Software-Defined BeiDou Receiver

Satellite-based positioning is undergoing a rapid change. Both the GPS and the GLONASS systems are being modernized to serve better the current challenging applications in harsh signal conditions. These modernizations include increasing the number of transmission frequencies and changes to the signal components. In addition, the European Galileo and the Chinese BeiDou systems are currently under development for global operation. Therefore, the research and development of Global Navigation Satellite System receivers in view of these new upcoming systems has been experiencing a new upsurge. In this paper, the authors discuss the main functionalities of a GNSS receiver in view of BeiDou satellite navigation system. While describing the main functionalities of a software defined BeiDou receiver, the authors also highlight the similarities and differences between the signal characteristics of BeiDou B1 open service signal and the legacy GPS L1 C/A signal, as they both exhibit similar characteristics in general. In addition, the authors implement a novel acquisition technique for long coherent integration in the presence of NH code modulation in BeiDou D1 signal. Finally, the authors present a BeiDou-only navigation fix with the implemented software-defined BeiDou receiver.

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