Integrity Analysis And Simulation Of Beidou Satellite Based Augmentation System

The construction of BDS-3 has finished and provided global positioning services,and BDSBAS is an important part of BDS construction.Civil aviation industry is one of the key application industries of BDS-3 in the future.Civil aviation has higher requirements on positioning accuracy,integrity,continuity and availability of the system,and focuses on the integrity parameters.Firstly,the composition and development of BDS and SBAS in the world are introduced.The main error sources of BDS are analyzed,including ephemeris and clock errors,tropospheric delays,ionospheric delays and multi-path noise,and the error correction is carried out by using corresponding models.Secondly,according to the "BeiDou Navigation Satellite System Open Service Performance Standard",the ionospheric grid is divided in China.The ionospheric algorithm and ionospheric grid model algorithm are analyzed,and the broadcast characteristics of D2 NAV Message integrity information are analyzed.In terms of the number and layout of the reference stations of the crustal monitoring network in China,the layout scheme of the WRS of the BDSBAS is selected,the rationality of the corresponding indicators is analyzed,and the suggestions for the layout of the reference stations are given.Finally,the integrity monitoring technology of BDSBAS is studied.GIVE and UDRE and location domain error limit algorithm are analyzed in detail.HPL and VPL and availability in China are calculated using the BDS data acquired by laboratory receivers.Based on MATLAB software,the integrity analysis software of BDSBAS is designed.Through friendly user interface and flexible configuration of input parameters,the corresponding parameters are calculated.According to the integrity requirements of different flight stages stipulated by ICAO,it provides reference for the construction and development of BDSBAS.