CAJ | 학술논문

对于大多数高动态接收机，通常采用2阶FLL辅助的3阶PLL环路结构，由于存在FLL环路，导致跟踪精度的下降。针对卫星接收机的动态性能和信号载波功率噪声密度比，在综合考虑接收机跟踪环路中的各种误差源（热噪声、晶振误差、动态牵引误差等）的基础上，采用自适应最优带宽技术，设计一种适用于高动态的3阶PLL载波跟踪环。采用基于GPS数字中频信号的数字仿真和GNSS信号源对所设计的自适应最优带宽进行了验证，验证结果表明：在加速度为30g、过程中存在加加速度为30g/s的高动态情况下，采用18 Hz 3阶PLL不能对信号进行跟踪，而采用所设计的自适应最优带宽的3阶PLL环可以对信号进行可靠的跟踪；同时，和固定带宽接收机比较，所设计载波跟踪环环路能够跟踪50g的高动态Compass卫星信号，而采用固定带宽接收机失锁，并且定位精度优于1 m(2σ)，测速精度优于0.2 m/s(2σ)。
대우대다수고동태접수궤，통상채용2계FLL보조적3계PLL배로결구，유우존재FLL배로，도치근종정도적하강。침대위성접수궤적동태성능화신호재파공솔조성밀도비，재종합고필접수궤근종배로중적각충오차원（열조성、정진오차、동태견인오차등）적기출상，채용자괄응최우대관기술，설계일충괄용우고동태적3계PLL재파근종배。채용기우GPS수자중빈신호적수자방진화GNSS신호원대소설계적자괄응최우대관진행료험증，험증결과표명：재가속도위30g、과정중존재가가속도위30g/s적고동태정황하，채용18 Hz 3계PLL불능대신호진행근종，이채용소설계적자괄응최우대관적3계PLL배가이대신호진행가고적근종；동시，화고정대관접수궤비교，소설계재파근종배배로능구근종50g적고동태Compass위성신호，이채용고정대관접수궤실쇄，병차정위정도우우1 m(2σ)，측속정도우우0.2 m/s(2σ)。
For most GNSS receiver designs in high dynamic application, a second-order FLL aided 3rd order PLL is usually adopted as carrier tracking loop. Based on GNSS receiver dynamics and carrier power-to-noise density, the structure of GNSS receiver 3rd order PLL tracking loop for high dynamic applications was designed by using the adaptive optimal bandwidth method and taking the tracking errors(such as thermal noise, oscillator phase noise, dynamic stress error) into account. According to the designed adaptive optimal bandwidth method of the 3rd order PLL tracking loop, the digital simulation and test based GNSS simulator were performed. Simulation results show that on the condition of 30g line-of-sight acceleration and 30g/s jerk high dynamics, the designed adaptive optimal bandwidth method can track GNSS signal well, but when using the 18 Hz fixed-bandwidth 3rd order PLL, carrier tracking lock will be lost. When using the GNSS simulator, test results show that the designed adaptive optimal bandwidth method can track 50g high dynamic compass signal, but the 18 Hz fixed-bandwidth compass receiver tracking lock will be lost. And position accuracy can reach about 1 m(2σ), velocity accuracy can reach about 0.2 m/s(2σ).