To minimize the cost and maximize the ease of use, a class of dual-spin mortars is designed which only rely on GPS receiver and geomagnetic measurements. However, there are some problems to be solved when the range is small, such as low correction authority and trajectory bending. Guidance law design for this mortar is detailed. Different guidance laws were designed for the ascending and descending segments, respectively. By taking variable parameter guidance law in the vertical plane and using compensation in the lateral plane, the problems mentioned above were resolved. Roll angle resolving algorithms with geomagnetic measurements were demonstrated and the experiment results proved to be effective. In order to verify the effectiveness, Seven-Degrees-of-Freedom (7-DOF) rigid ballistic model were established and hardware in the loop simulation was introduced. After the transform function of the actuator was obtained, the control model of the shell was improved. The results of the Monte Carlo simulation demonstrate that the guidance law is suitable and the mortar can be effectively controlled.
Abstract-A new rolling rate tracking method based on frequency-locked loop (FLL) was present in order to solve problems by low price, exact measurement and in-time correction mean for rocket projectile. The geomagnetic field component was firstly measured by magneto-resistive sensor and the frequency of signal was tracked by FLL. The geomagnetic field component regularity was analyzed in range of rocket projectile, which was changed by sine principle according to the trajectory character. The tracking algorithm of FLL was introduced in detail. In order to validate verification of the algorithm, the simulation model was build up by Matlab/Simulink. The simulation results showed that the algorithm could exactly track the frequency of the Chirp signal source from 5Hz to 18Hz. In further, the tracking algorithm was implied on sampling geomagnetic field component data of rocket projectile. The experiment results indicated that it could satisfy the missile-borne controller need of low price and high accuracy.
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