CAJ | 학술논문

为实现对高动态和低载噪比信号的稳定跟踪，在全球导航卫星系统（Global Navigation Satellite System， GNSS）接收机的跟踪环路设计中采用惯性导航系统（Inertial Navigation System，INS）辅助锁相环（Phase Lock Loop，PLL）的环路结构。对 INS 辅助环路的各误差源进行了建模与分析，并分析了惯性器件精度对跟踪误差的影响。基于跟踪误差最小的原则设计了最优环路带宽，根据载波信号的载噪比和环路动态实时自适应地调整 PLL 带宽，使环路始终工作在最小误差状态。结果表明：所设计 INS 辅助的自适应带宽调节方法能有效减小环路跟踪误差，并提高复杂环境下信号的跟踪精度。
위실현대고동태화저재조비신호적은정근종，재전구도항위성계통（Global Navigation Satellite System， GNSS）접수궤적근종배로설계중채용관성도항계통（Inertial Navigation System，INS）보조쇄상배（Phase Lock Loop，PLL）적배로결구。대 INS 보조배로적각오차원진행료건모여분석，병분석료관성기건정도대근종오차적영향。기우근종오차최소적원칙설계료최우배로대관，근거재파신호적재조비화배로동태실시자괄응지조정 PLL 대관，사배로시종공작재최소오차상태。결과표명：소설계 INS 보조적자괄응대관조절방법능유효감소배로근종오차，병제고복잡배경하신호적근종정도。
In order to steadily track carrier signal under high dynamic or low C/N0 (Carrier to Noise Power Ratio)environments,during tracking loop of Global Navigation Satellite System (GNSS)receivers’de-sign stage,the Inertial Navigation System (INS)-aided Phase Lock Loop (PLL)structure is adopted. The error sources of the INS-aided PLL is built and the influence of inertial device’s accuracy on the tracking error is analyzed.Then,an optimal loop bandwidth design method is proposed based on the principle of minimizing the tracking error,and PLL bandwidth can be adjusted adaptively according to C/N0 of carrier signals to make the loop work all the time in minimum error state.The results show that the PLL tracking error is significantly decreased by aiding of INS,and the tracking accuracy is improved un-der challenged environments.