带限BOC信号下双重估计技术多径性能分析  

Analysis on Multipath Performance of Dual Estimate Technology for Band-limited BOC Signals

作　　者：周兵 高扬 崔晓伟[2] 姚铮[2] 靳舒馨 

机构地区：[1]北京卫星导航中心,北京100094 [2]清华大学,北京100084

出　　处：《无线电通信技术》2015年第5期36-40,共5页Radio Communications Technology

基　　金：高等学校博士学科点专项科研基金项目(20120002120006)

摘　　要：为优化天线带宽和硬件资源受限情况下导航接收机的设计,针对用于卫星导航系统BOC信号接收的双重估计技术,比较了其两种副载波跟踪方法:SPLL与SDLL,在信号带宽受限下的多径性能。针对SPLL与SDLL的特点,首先提出一种基于傅里叶级数形式的多径误差分析方法,从理论上比较了两类方法在各种带宽下的多径性能。通过仿真验证表明,带宽内是否含有副载波频率谐波分量是决定两方法多径性能优劣的主要因素。信号带宽内仅含副载波基频分量时,SPLL的多径性能与SDLL相似;信号带宽内含有副载波谐波分量时,SDLL可提供更好的抗多径能力。In order to optimize the navigation receiver design under limited antenna bandwidth and hardware resource, the muhipath performance of two subearrier tracking methods, called SPLL and SDLL, are compared in band-limited signal conditions. These two tracking methods are parts of dual estimate technology that designed for receiving BOC signal in satellite navigation systems.The SPLL and SDLL discriminator functions and muhipath error models are put forward in Fourier series form,based on it,the multipath perform- ance can be compared in various bandwidths in theory,and proved by simulations.The results show that the key factor determining the muhipath performances is whether the bandwidth contains the harmonic component of subcarrier or not. SPLL has similar multipath performance with SDLL when the signal bandwidth contains only the base frequency component of subearrier, the SDLL can provide better performance when the signal bandwidth contains the third and higher harmonic component of subcarrier.

关 键 词：双重估计技术 多径性能 副载波跟踪 信号带宽 

分 类 号：P391.9[天文地球—地球物理学]