摘要
从GNSS接收机对伪码延迟锁定环(DLL)快速稳定的需求出发,分析了环路滤波器带宽对码环性能的影响,对不同带宽下环路的稳定时间和跟踪精度进行了测试。提出了一种自适应带宽的码环设计方案,通过对环路滤波器带宽的实时调整,有效地实现了码环牵引过程的快速稳定和精确跟踪,提升了码环性能。利用自研的GNSS接收机进行了测试和验证,测试结果表明码环稳定时间小于400 ms。
Based on the requirement of fast setting of the Delay Lock Loop（ DLL） on GNSS receivers,this paper analyzes the influence of the loop filter bandwidth on the performance of the code loop,and tests the setting time and tracking accuracy of the loop under different bandwidths. An adaptive bandwidth DLL is proposed,which can effectively achieve the fast setting and accurate tracking through the real-time adjustment of the bandwidth of the loop filter,and thus improves the performance of the code loop. A self-developed GNSS receiver is used to test and verify the proposed solution. The result shows that the setting time of the DLL is less than400 ms.
出处
《无线电通信技术》
2017年第4期64-66,79,共4页
Radio Communications Technology
基金
国家高技术研究发展计划(863计划)项目(2015AA124001)
