Study on GNSS Interoperability

Interoperability is a hot issue among all satellite navigation systems, which is the important approach for BeiDou to be global. GPS and Galileo have firstly finished the design of interoperability in L1 and E1 band, where the TMBOC and CBOC are designed respectively, with the carrier frequency 1575.42 MHz. In this paper, the definition of interoperability is given; a detailed requirement analysis for interoperability is illuminated. The contribution of interoperability that more satellites can be chosen by user receiver at any points is tested. Code tracking error and multi-path error envelope are used to evaluate the signal performance. Some interoperability ways that could be taken for BeiDou were introduced, including carrier frequency, modulation type and navigation message.