北斗卫星导航系统建设与发展(英文版)分析.ppt

* * * * * * * * * * * * * * * * * * * * Contents 1.Basic principles of the State Policy 2.System General Description 3.System Deployment 4.Applications 5.Compatibility and Interoperability 6.Conclusion * Applications * BeiDou Navigation Demonstration System has played important roles in various areas. Surveying and mapping Communication Water conservancy Disaster mitigation Marine Transportation Mining Forest fire rescue etc. Contents 1.Basic principles of the State Policy 2.System General Description 3.System Deployment 4.Applications 5.Compatibility and Interoperability 6.Conclusion * Views on Compatibility and Interoperability Related Bilateral Activities Compatibility and Interoperability * Compatibility: the ability of multiple satellite navigation system to be used separately or together, without causing harmful interference with use of each individual service or signal. International Telecommunication Union provides a framework for discussion on radiofrequency compatibility. * Compatibility Spectrum overlap: There actually exist some cases of frequency overlap between signals of different systems and it is feasible for navigation systems to share the same frequency spectrum. The frequency spectrum overlap of open signals is beneficial for the realization of interoperability for many applications. * Compatibility Spectrum separation of authorized service : The authorized service signal spectrum separation with open service signals is beneficial. Signal design should consider many factors. Due to the quite limit of frequency resources, authorized signal spectrum separation is very difficult at present. It’s very difficult to satisfy the frequency resource requirements of modernization signals of existing systems and the signals of new systems to be built. * Compatibility Interoperability: the ability of open services of multiple satellite navigation system to be used together to provide better capabilities at the user level than would be achieved by rely