Development of a Software GNSS/RNSS Receiver with Carrier-Phase Output

This paper discusses the development of a Matlab-based multi-Global Navigation Satellite System (GNSS) software receiver. Compared to a real-time GNSS receiver, the major difference is in the implementation mechanism of latching and processing the measurements between the receiver channels of a satellite system as well as channels of different systems. Implementation challenges increase due to differences in the system time as well as the code repetition period. The signal processing modules, especially the tracking module of a conventional Matlab multi-GNSS/RNSS software receiver, consume an enormous amount of time as IF data is read sequentially, requiring considerable file I/O operations. The proposed software receiver architecture uses the built-in parallel processing functions in Matlab to speed-up the execution by simultaneously processing multiple channels.