摘要
导航信号模拟源器是接收机性能验证的重要技术手段,目前的研究多关注于高动态场景实现和伪距误差分析,对于静态伪距和恒定多普勒等高精度测量场景中的伪距精度少有分析。本文针对高精度测试场景,分析了相位量化误差的产生原因,推导了由此引起的伪距误差公式并给出了仿真验证。分析和仿真结果表明:相位累加字量化误差影响伪距稳定度,进位相位截断误差引起的相位抖动影响伪距零值测量结果,两种误差均不可忽略。为高精度卫星导航信号模拟器的设计提供了理论依据。
As the measuring equipment of the navigation receivers, high precision pseud orange signal is generated by navigation signal simulator. Pseudorange error is mainly from modeling error in high dynamic scenarios, but it is mainly from phase quantization error of digital implementation process in high precision scenarios of evaluating receiver＇s pseudor ange accuracy. Is this paper, according to the implementation principle of carrier and code DDS, the causes of the phase quantization error is analysis and the pseudorange error formu- la is derived and the simulation results are given. Analysis and simulation results show that phase increment word quantization effects pseudorange stability and phase critter originated by carry phase truncation effects measurement result of zero value. Two kinds of errors can- not be ignored. The conclusion can guide the design of navigation signal simulator.
出处
《全球定位系统》
2014年第6期6-10,共5页
Gnss World of China
关键词
导航信号模拟
伪距精度
DDS
相位抖动
Navigation signal simulation
pseudorange precision DDS
phase critter
