A smart munition revolves by 2～3Hz when it flights. Before guidance starts, the roll estimation of a smart munition is an important factor to improve the navigation performance. The roll estimation algorithm is already known using IMU and GPS. But GPS can't be available as a measurement under GPS jamming environment. This paper explains how to estimate the roll angle of a smart munition under jamming environment by using IMU, earth magnetism measurements. The system and measurement models of the extended Kalman filter are designed for GPS jamming environment. Under GPS jamming environment, the proposed method shows better performance than the previous method by Monte Carlo simulation.
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