Early warning image ballistic missile direction estimation method under single-satellite condition

Abstract

The invention specifically discloses an early warning image ballistic missile direction estimation method under a single-satellite condition. The method comprises the following steps: S1, obtaining an original image of a target missile, and carrying out target detection on the obtained original image at a known time interval to extract a centroid coordinate of the target missile in the corresponding original image; s2, performing target tracking according to the center-of-mass coordinates of the target missile and the corresponding time information so as to obtain the motion trail of the target missile; s3, converting the motion trail attitude data of the target missile into an earth coordinate system, and finding out a corresponding trajectory point in the earth coordinate system; s4, establishing a normal vector equation set corresponding to the ballistic trajectory plane according to the ballistic trajectory points; and S5, establishing a coordinate equation of the target missile by using the collinear equation, and solving the missile direction according to the coordinate equation and the normal vector equation set. According to the invention, an accurate result can be obtained without ballistic prior knowledge, and the method has the characteristics that the required data is easy to obtain, the calculation amount is small and the calculation time is short.

Description

technical field [0001] The invention relates to the technical field of flight dynamics, in particular to a method for estimating the direction of a ballistic missile with an early warning image under the condition of a single satellite. Background technique [0002] In the construction process of the space-based early warning system, due to factors such as project expenditure, preliminary experiments and feedback verification, the deployment of early warning satellites has stages. In the development process of space-based early warning system, considering the possible failure of sensors, and in the development process of high-orbit early warning satellites, the early warning is in the state of single-satellite detection in the initial development stage, and the estimation of ballistic missile parameters based on single-satellite observation is the key It is an important process that the basic optical early warning system must go through. [0003] The ballistic missile direc...

AI Technical Summary

Problems solved by technology

The movement force of the active section is complex, and its own model is also relatively complex. Therefore, how to reasonably simplify the model of the active section and form a reasonable constraint relationship has become a key factor affecting the accuracy of the results of this type of method. This method needs to know the mass and mass change rate of the missile , the relative effective jet velocity and thrust of the missile's high-temperature gas, and these data are also not easy to obtain

[0007] (3) The ballistic observation imaging model based on the imaging relationship constraint parameter estimation algorithm assumes the first observation point as the launching point. Due to the limitation of fewer measurement data points, the problem of underdetermined and unsolvable equations is prone to occur

Using the Monte Carlo (Monte Carlo) method to calculate the numerical solution and obtain statistical results requires proper selection of parameters based on prior knowledge, and the reliability is difficult to guarantee

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