According to the trajectory characteristics of hypersonic boost-glide vehicles. a tightly coupled integrated navigation algorithm for hypersonic vehicles based on the launch-centered Earth-fixed (LCEF) frame is proposed. First. the strapdown inertial navigation mechanization algorithm and discrete update algorithm in the LCEF frame are introduced. https://www.ngetikin.com/quick-offer-1-Gallon-Universal-Primer-Pro-Deep-Penetrating-Primer-big-deal/