Due to the limitation of target dynamic transformation and fixed angle of view, the engineering application of medium and long-term monocular-viewpose measurement in the shooting range is still a difficult problem, a target image matching pose processing method based on two scales of line vector direction and length is proposed. The feasibility of the algorithm is verified by actual flight calibration experiments; the accuracy evaluation model is deduced according to the influence conduction relationship of the model. Compared with the data processing results in the same paragraph, the effectiveness of the evaluation results is verified, which provides a theoretical basis for the optical medium and long-term pose measurement of monostatic axisymmetric rotating target.
To reflect the pose measurement reliability under the real measurement track and provide the basis for station layout in advance and post-processing, a closed-loop error analysis method based on line vector pure direction projection and reverse reconstruction is proposed. Firstly, the central axis method is simplified and the key errors are located, according to the process of pose simulation - perspective projection - key parameter error acquisition - central axis reconstruction - pose accuracy acquisition, in this paper the accuracy evaluation method of central axis pose rendezvous measurement with closed-loop feedback establishes is established for the first time. Compared with the traditional partial derivative method, it not only highlights the influence of key parameters, but also is convenient, intuitive and accurate, Moreover, the problem of unknown key parameters is solved. This method provides a reliable theoretical support for station layout test, accuracy prediction and post analysis for range pose measurement.
To solve the question of monocular pose measurement of the non-projected-axisymmetric targets, a Contour Image Length matching method is proposed,firstly,the contour of the targets is simplified as many triangles based on nose to solve the information redundancy and visual occlusion;secondly,the simplified target is projected to the image plane to get virtual image length,the actual image length is extracted simultaneously, then the pitch, yaw and roll angle can be obtained by length matching between virtual image and actual image. The aircraft flight calibration test shows that the precision of the pitch angle, yaw angle and roll angle was 0.9 degrees,1.2 degrees, and 1.5 degrees respectively, which indicated the result is slightly lower than intersection, but can save cost and improve efficiency. Finally, the key factors concerning method error are analyzed; the method can lay an important foundation for monocular pose measurement in range.
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