In this paper, a joint posture determination algorithm of rocket contour line and cooperative measurement ring photographed by high-speed TV in the shooting range is proposed targeting at the complex test range environment with lot of smoke and backlight. This algorithm makes up for the shortcomings of traditional algorithms in some extreme cases. The method makes use of the relative relation between the target contour edge and the measuring ring edge and the cylindrical rocket body. Even if under the poor imaging, the method can still calculate out the information about the posture of the rocket. If the method is validated with the measured data, the difference values of the calculation results are as accurate as the calculation results of the traditional methods. However, this method is better in anti-interference and has a more extensive application scope, achieving the expected purpose.
In order to expand the scope of exterior trajectory measurement system, it is required to make full use of various heterologous measuring elements to establish a joint positioning model with multi-system measurement information to make up the traditional positioning method. Meanwhile, there must be many redundant observations in the tracking measurement. It will improve the accuracy and continuity of target tracking measurement and optimize the comprehensive measurement level of the measurement and control system and unit efficiency by making rational use of these redundant measurements and processing with data fusion algorithm. The measuring angle and range of optical measuring unit and constraint equation of GNSS pseudo range measurement information were discussed in this paper. Optical and GNSS joint measurement model was established. The least square solution of this nonlinear equation was obtained with Newton iteration method. Finally, simulation data was used to verify the result. The result shows that the target position can be calculated by making use of the measured information of optical and GNSS unit in the minimum positioning condition, and the accuracy of fusion calculation result will improve correspondingly when there are many redundant measurement elements.