GNSS信号质量关键指标测试方法研究

Measurement Methods of GNSS Signal Quality Key Assessment Indexes

卫星导航信号质量直接影响导航系统性能,因此信号质量评估是卫星导航系统设计和运行控制过程中的重要环节。分析了卫星信号质量对导航性能的影响,系统介绍了信号质量的主要评估参数,并对测试方法进行了详细说明。重点介绍了基于伪距和载波相位的I/Q载波正交性、码-载波相干性、码-码相干性的测试原理及实现方案。实测结果表明,I/Q载波正交性和码-载波相干性测试精度小于0.5°,码-码相干性测试精度可达100 ps。

Since the signal quality has direct impact on the performance of satellite navigation system,the signal quality assess-ment has been an important work in process of navigation system design and the operation control stage.This paper analyzes the impact of signal quality on navigation system performance,and introduces the signal quality assessment parameters.The measurement methods of these parameters are also studied in this paper.The measurement principles and the hardware implementation of I/Q carrier Orthogonali-ty,code-carrier coherency, and code-code coherency are discussed, which are based on the measurement of pseudorange and carrier phase.Test results show that the measuring accuracy of I/Q carrier orthogonality and code-carrier coherency can be less than 0.5＆#176; and the accuracy of code-code coherency can be less than 100 ps.