Zhu, Xuefen, Fei Shen, Jianfeng Chen, Yang Yang, Dongrui Yang, and Xiyuan Chen. “Combined Tracking Strategy Based on Unscented Kalman Filter for Global Positioning System L2C CM/CL Signal”. Defence Science Journal 65, no. 5 (September 11, 2015): 395-402. Accessed September 27, 2020. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/8725.