高动态GNSS接收机载波跟踪环自适应最优带宽设计与试验  

Experimental study and design on high dynamic GNSS receiver using adaptive optimal bandwidth for carrier tracking loop

作　　者：唐康华[1] 武成锋 杜亮 何晓峰[1] 

机构地区：[1]国防科学技术大学机电工程与自动化学院,长沙410073 [2]北京自动化控制设备研究所,北京100074 [3]宜昌测试技术研究所,宜昌443003

出　　处：《中国惯性技术学报》2014年第4期498-503,共6页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金项目(61104201)

摘　　要：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)。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 (2 σ), velocity accuracy can reach about 0.2 m/s (2 σ).

关 键 词：GNSS接收机 自适应最优跟踪带宽 载波跟踪环 高动态条件 信号载波功率噪声密度比 

分 类 号：U666.1[交通运输工程—船舶及航道工程]