Overview of Carrier Tracking Algorithms
LI Wen-lin · Jisuanji fangzhen · 2008
With the rapid development of the software GPS receiver, the tracking method, as the key technology of it, has achieved great development consequently. Based on a common structure of the carrier tracking loop, the carrier tracking algorithms were simply classified as pure carrier tracking algorithm and extern-aided carrier tracking algorithm. The pure carrier tracking technologies, such as the design of phase and frequency discriminator, the design of low-pass filter, the design of hybrid tracking algorithm based on FLL and PLL, the induction of intelligently estimated technology and the noise reduction technology into carrier tracking loops and so forth, were summed up. And the extern-aided carrier tracking technologies, which were commonly used in tightly coupled or ultra-tight coupled GPS/INS integrated navigation systems, were analyzed. The advantage or disadvantage of pure carrier tracking technology and extern-aided carrier tracking technology were summed up. Meanwhile, the research direction of carrier tracking was proposed.