Research on armature position estimation for electromagnetic launcher based on B-dot probe

Electromagnetic orbital launcher technology has a broad application prospect, and accurate measurement of armature velocity is the key to the application of electromagnetic orbital launcher. In this paper, the principle and method of armature motion measurement by B-dot probe are studied, the expression of B-dot probe induced voltage considering the influence of current slope is deduced, and the motion process of armature chamber is analyzed, and the accuracy of the method is verified by numerical calculation. The method proposed in this paper can effectively improve the precision of armature position measurement and has certain guiding significance for the measurement of armature speed of electromagnetic orbit transmitter.