CAJ | 학술논문

为解决在高动态环境下GPS接收机跟踪环路中频信号失锁的问题，提出了一种基于线性强跟踪卡尔曼滤波器（STKF）理论的GPS信号跟踪环路．此跟踪环路以码鉴相器和载波鉴相器输出作为观测量，利用线性强跟踪卡尔曼滤波器对高动态环境下的码相位误差、载波相位误差、多普勒频率误差以及多普勒频率变化率误差进行估计，并将估计结果反馈给跟踪环路的数控振荡器，从而产生准确的本地载波和本地码．仿真结果表明，在GPS信号载噪比为45 dB Hz时，线性强跟踪卡尔曼滤波器跟踪环路在多普勒频率变化率为5．0 kHz/s时仍能可靠跟踪，而传统的基于PLL/DLL和环路滤波器的跟踪环路在1．8 kHz/s时已经失锁．
위해결재고동태배경하GPS접수궤근종배로중빈신호실쇄적문제，제출료일충기우선성강근종잡이만려파기（STKF）이론적GPS신호근종배로．차근종배로이마감상기화재파감상기수출작위관측량，이용선성강근종잡이만려파기대고동태배경하적마상위오차、재파상위오차、다보륵빈솔오차이급다보륵빈솔변화솔오차진행고계，병장고계결과반궤급근종배로적수공진탕기，종이산생준학적본지재파화본지마．방진결과표명，재GPS신호재조비위45 dB Hz시，선성강근종잡이만려파기근종배로재다보륵빈솔변화솔위5．0 kHz/s시잉능가고근종，이전통적기우PLL/DLL화배로려파기적근종배로재1．8 kHz/s시이경실쇄．
A novel linear STKF(strong tracking Kalman filter)-based GPS (global positioning sys-tem)tracking-loop estimator is developed to resolve the losing lock problem of GPS IF (intermediate frequency)signal tracking loop in high dynamic environment.Code phase detector and Carrier wave phase detector are used as the observations of the STKF.The code phase errors,carrier phase errors, Doppler shift errors and the rate of change of Doppler shift errors are estimated with the STKF.The estimation results of the STKF are responded to the tracking-loop NCOs (numerically controlled os-cillator)to generate accurate local carrier and local code.The simulation results indicate that,in the case that the carrier-to-noise ratio is 45 dBHz,the STKF tracking loop works well even if the change rate of Doppler shift reaches 5 .0 kHz/s,but the traditional tracking loop based on PLL (phase lock loop)/DLL (delay locked loop)and loop filters may lose lock at 1 .8 kHz/s.