Near space hypersonic target tracking method based on aerodynamic model

Abstract

The invention provides a near space target tracking method based on aerodynamic model tracking. The method comprises the following steps: firstly, an aerodynamic acceleration is introduced, a closed loop from a height h(k) to h(k+1) is built outside the traditional motion equation, and a correction motion equation for the target in an unpowered gliding stage is further acquired; then, inverse causality between the target height and the aerodynamic acceleration is explored, and on the basis, a matched tracking model for the target in the unpowered gliding stage is designed; and finally, on the basis of matched tracking in the unpowered gliding stage, by using thrust detection and a compensation mechanism, a matched tracking model for the target in a powered push-up state is further designed.

Description

technical field [0001] The invention relates to the field of hypersonic target tracking in near space, and is used for solving the problem of hypersonic boost-gliding trajectory tracking unique to near space targets. Background technique [0002] Proximity space vehicles have their unique hypersonic boost-glide trajectory. Compared with the fixed orbit of satellites, the trajectories of adjacent spacecraft show a trend of jumping up and down, and there is no fixed law at all. Compared with traditional aircraft targets, the speed of adjacent space vehicles is usually above Ma5, which also means that the aerodynamic force it receives will be much greater than that of ordinary aircraft targets. At this time, under the condition that the aerodynamic force is greatly affected, the speed, angle and acceleration of the adjacent space vehicle will change in a time-varying situation, which will bring greater uncertainty to the existing radar target tracking technology. [0003] In ...

AI Technical Summary

Problems solved by technology

Among them, the target tracking based on acceleration detection is an estimation and compensation method that regards acceleration as an unknown input. This type of method has a good tracking effect on the case of strong target mobility, but there is a certain time delay problem. Therefore, this kind of method is mostly not used in the research of hypersonic moving near-space target tracking; adaptive model tracking pays more attention to the self-adjustment performance of the model, and this type of method can effectively solve the possible For this reason, most of the existing research on target tracking in adjacent space is based on the method of adaptive model tracking, but its disadvantage is that it has high requirements for the prior information of the target. When the selected model is consistent with the real situation of the target When the difference is large, a large model tracking error will be introduced; different from single-mode adaptive tracking, the multi-model tracking method can effectively achieve the optimal tracking of adjacent space targets through the joint use of multiple models, but its disadvantage is that when When the selected model differs greatly from the real trajectory of the target, it will also lead to a decrease in target tracking accuracy

[0004] However, the research of these methods did not fully consider the aerodynamic characteristics of the adjacent space target, and did not effectively study its unique boost-gliding trajectory

That is to say, if the existing methods are directly used to track objects in the adjacent space, it will inevitably lead to large tracking errors due to model mismatch

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