A FLL-PLL Cooperative GNSS Weak Signal Tracking Framework

作者：Liu Yang^*; Zhu Yan bo

来源：International Conference on Design, Manufacturing and Mechatronics (ICDMM), 2014-03-21 To 2014-03-24.

DOI：10.4028/www.scientific.net/AMM.551.470

• FLL-PLL Cooperative Tracking
• Dynamic adaptation
• Discriminator Hypothetical Detection

Navigation signals should be steadily tracked to allow the extraction of navigation information, and support the calculation of navigation solution. Generally, extraction of navigation information is realized by GNSS tracking loops, which need to implement two critical operations: 1) tracking parameters should be precisely estimated in order to reliably decode the navigation message. 2) Successive tracking method of navigation information. This paper proposes a novel tracking framework using dynamic FLL assisting PLL strategy and a loop state detection monitor. The new framework extends traditional phase and delay locked loop (PLL/DLL) tracking framework, and contributions mainly lie in two parts. A dynamic framework for parameters adjustment is proposed to avoid tracking failure due to the change of environment, which is complemented in a FLL-PLL cooperative framework. Experimental results demonstrate the advantages of our algorithm compared with standard PLL/DLL framework. It is shown that the algorithm proposed is more suitable for tracking under signal attenuation situation, while maintaining high performance at the same time.

• 出版日期2014
• 单位北京航空航天大学