In order to optimize the navigation receiver design under limited antenna bandwidth and hardware resource,the multipath performance of two subcarrier 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 multipath 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 multipath 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 subcarrier, the SDLL can provide better performance when the signal bandwidth contains the third and higher harmonic component of subcarrier.%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。
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