摘要
根据理论分析,相关间隔是影响伪码测距的重要因素。窄相关作为导航接收机研制过程中的主要技术手段,它可以抑制由热噪声带来的测量误差。通过对测量误差建立数学模型分析,得出了窄相关减小测量误差与信号双边前端带宽的关系。通过MATLAB仿真,验证了窄相关对测量误差的贡献是受信号双边前端带宽约束的结论。当信号双边前端带宽固定时,窄相关对测量误差的贡献固定。同时,给出了窄相关的实现条件。为窄相关在工程应用中的应用提供了理论依据。
The theory shows that correlator space is an important factor of measure error. Narrow correlator spacing is an important step of PN code measure. It can reduce measure error raised by thermal noise. By analysing the measure error, we can draw a conclusion that the relation between reduce measure error and double-sided front-end bandwidth. By the MATLAB simulation, It validates the conclusion that narrow correlator contributes to measure error is restricted by double-sided front-end bandwidth. When double-sided front-end bandwidth is decided, the contribution is decided. Simultaneouly we draw a conclusion about the narrow correlator realization, it provides theory foundation for project applications.
出处
《无线电工程》
2009年第11期35-36,共2页
Radio Engineering
关键词
窄相关
测量误差
DLL
相关间隔
narrow correlator spacing
measure error
DLL
correlator space
