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在星载导航系统的初步方案规划和算法设计阶段,出于对潜在的折中考虑,高保真的GPS软件仿真器是一种必要且可行的实验室测试手段。本文研究开发了面向空间导航系统设计的GPS量测软件仿真器,它主要针对L1C/A码和载波信号,也就是说该仿真器使用MATLAB编程语言产生C/A码伪距量测和载波量测。论文推导了基于地心惯性坐标系(ECI)的数学模型,用来仿真GPS星座并产生GPS量测数据;在星历数据选择、空间电离层模型和伪距率计算等方面,深入研究并应用一系列增效措施以合理化实现该仿真器。建立的增强型GPS量测仿真器推进了我们现有的星载GPS/INS组合导航系统设计工作,将进一步提升在星载导航系统设计领域的研究。
In the initial planning and algorithm design stages of the spaceborne navigation system, the high-fidelity GPS software simulator is a necessary and feasible laboratory test out of potential compromise. In this paper, GPS-oriented software simulator designed for space navigation system is researched and developed, which is mainly aimed at L1C / A code and carrier signal, that is to say the simulator uses MATLAB programming language to generate C / A code pseudorange measurement and carrier Measurement. The paper deduces a mathematical model based on the geocentric inertial coordinate system (ECI), which is used to simulate GPS constellation and generate GPS measurement data. In the aspects of ephemeris data selection, space ionosphere model and pseudo-range calculation, A series of efficiency measures to rationalize the emulator. The enhanced GPS measurement simulator built on our work promotes the design of our existing onboard GPS / INS integrated navigation system and will further enhance the research in the field of spaceborne navigation system design.