摘要
测距精度是评估卫星自主完好性监测接收机在导航信号畸变环境下工作性能的一个重要指标。推导了卫星自主完好性监测接收机在国际民航组织二阶阶跃畸变模型下采用早晚相干跟踪处理时测距精度与畸变模型参数的解析表达式,理论分析和仿真结果表明数字畸变将导致接收机伪码鉴相器输出曲线存在过零点偏差,数字畸变量基本不影响接收机测距方差;模拟畸变将扭曲相关峰函数和鉴相器输出曲线,但鉴相器输出基本上不存在过零点偏差,模拟畸变参数、前端滤波器带宽和早晚码间距共同影响接收机的测距方差。
Ranging accuracy is an important indicator to assess the performance of satellite autonomous integrity monitoring receivers in the threat environment.Analytical expressions of the relationship between the accuracy of code tracking loop and the parameters of International Civil Aviation Organization 2nd-order step threat model when employing coherent early-late processing in the satellite autonomous integrity monitoring receiver were presented.Theoretic analysis and simulation results show that the code phase estimator output curve will be biased under the digital failure model and the failure parameters will rarely impact the ranging variance.While the analog failure will distort the cross-correlation function and the code phase estimator output the curve,the curve is almost unbiased,and the ranging variance is affected by the analog failure parameters and receiver parameters such as front-end filter bandwidth and early-late code space.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2014年第5期111-116,共6页
Journal of National University of Defense Technology
基金
教育部新世纪人才支持计划资助项目(NCET-08-0144)
关键词
卫星自主完好性监测
测距精度
信号畸变
二阶阶跃
satellite autonomous integrity monitoring
ranging accuracy
signal anomalous
2nd-order step
