Dynamic Time Warping-based Trajectory Angles Evaluation for the Flight Vehicle

Aiming at the requirement of evaluation to trajectory parameters like trajectory inclination angle and trajectory deflection angle in the flight vehicle test, a dynamic time warping (DTW) based trajectory angles evaluation method is proposed in this article. The DTW algorithm is introduced and optimized for its application to the similarity matching between the realistic and theoretical trajectory of the flight vehicle. Then, with the resulting matching and mapping relationship, the similarities between the realistic and theoretical trajectory angles series are evaluated, where the overall similarity coefficient and Theil inequality coefficient are employed by taking the two angular distance series in consideration. The trajectory data analysis is performed from multiple aspects, and the results verify the feasibility of the proposed method to trajectory angles evaluation for the flight vehicle.