Improvement of GNSS Carrier Phase Accuracy Using MEMS Accelerometer-Aided Phase-Locked Loops for Earthquake Monitoring

Micromachines

Hengrong Liu¹  Hongping Zhang¹  Qijin Chen¹  Xiaoji Niu¹  Tisheng Zhang¹ 

[1] GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;

关键词: PLLs;    MEMS accelerometer;    carrier phase;    GNSS;    earthquake monitoring;   

DOI  :  10.3390/mi8060191

来源: DOAJ

【 摘 要 】

When strong earthquake occurs, global navigation satellite systems (GNSS) measurement errors increase significantly. Combined strategies of GNSS/accelerometer data can estimate better precision in displacement, but are of no help to carrier phase measurement. In this paper, strong-motion accelerometer-aided phase-locked loops (PLLs) are proposed to improve carrier phase accuracy during strong earthquakes. To design PLLs for earthquake monitoring, the amplitude-frequency characteristics of the strong earthquake signals are studied. Then, the measurement errors of PLLs before and after micro electro mechanical systems (MEMS) accelerometer aiding are analyzed based on error models. Furthermore, tests based on a hardware simulator and a shake table are carried out. Results show that, with MEMS accelerometer aiding, the carrier phase accuracy of the PLL decreases little under strong earthquakes, which is consistent with the models analysis.

【 授权许可】

Unknown