GPS/BDS/GALILEO多模单频单历元RTK定位算法

Instantaneous Single-Frequency RTK Positioning Using Combined GPS / BDS / GALILEO System

单一卫星系统单频RTK定位可靠性较低,难以满足实时定位需求。由于GPS,BDS及GALILEO均采用CDMA技术体制,GPS/BDS/GALILEO多模系统耦合度较高,可有效应用于RTK动态定位。采用实测数据进行GNSS单频单历元RTK计算,实验结果表明:多模GNSS系统其模糊度ADOP值较小,模糊度固定成功率较高更适用于RTK定位领域。截止高度角较高时多模系统优势更加明显。

Single satellite system is difficult to satisfy the requirement of real-time positioning because of the poor reliability. As GPS, BDS and GALILEO adopt the Code Division Multiple Access（ CDMA） technology, combined GPS / BDS / GALILEO system can take full advantages of the integrated system. The instantaneous single-frequency RTK performance has been evaluated by an empirical analysis, consisting of the ambiguity dilution of precision（ ADOP）, integer least-squares success rates（ SR） and positioning accuracy. The experiment results using real data have indicated that the combined GPS / BDS / GALILEO system is beneficial to improve the integer ambiguity resolution and positioning performance over single system, particularly for higher cut-off angles.