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Extended Kalman Filter (EKF) can not only be used for tracking L1 signal under high dynamic, but also combine with semi-codeless techniques to track high dynamic L2 signal. And EKF can hold stability lock with semi-codeless in the ionospheric scintillation. The method of maximum a posteriori (MAP) estimation is used to estimate the unknown W-bit to overcome anti-spoofing (AS). EKF based semi-codeless...
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