Simulation method applicable to space tethered system of stratospheric satellite system

Abstract

The invention provides a simulation method applicable to a space tethered system of a stratospheric satellite system. The method comprises the steps of averagely dividing a tether to be a plurality of sections with the same length, building a mathematic model for the stratospheric satellite system, deriving a node constraint equation and solving a second derivative according to the position relationship between a node and each section of the tether, and performing integral solution on the equation by using a fourth-order Runge-Kutta method, so as to finish a simulation task for the tethered system of the stratospheric satellite system. According to the simulation method provided by the invention, with a view to the gravity and softness of the space tethered system, the accuracy and effectiveness for transferring the magnitude and direction of the control force by the space tethered system can guaranteed.

Description

technical field [0001] The invention relates to a simulation method, in particular to a simulation of stratospheric satellites. Background technique [0002] Stratospheric satellites operate in the 20-35km stratosphere, and carry different payloads to complete tasks such as data communication, ground observation, and battlefield monitoring. Stratospheric satellites are based on traditional high-altitude balloons, using space tethers to connect the superpressure balloons at the top and the aerodynamic sails at the end to form a stratospheric satellite system consisting of "superpressure balloons + space tethers + aerodynamic sails". The pneumatic sail realizes the trajectory control of the system, so that the system moves around the earth along a specific orbit in the stratosphere. [0003] The motion process of the space tether of the stratospheric satellite system is a complex dynamic problem, and inappropriate tether modeling and simulation methods will cause large errors...

AI Technical Summary

Problems solved by technology

[0003] The motion process of the space tether of the stratospheric satellite system is a complex dynamic problem, and inappropriate tether modeling and simulation methods will cause large errors in the tether motion process

At present, for the stratospheric satellite system, the tether is generally considered simply as a light rigid body in a straight line state. remains unchanged, but this modeling method ignores the influence of gravity and flexibility of the system, which will cause the simulation results to seriously deviate from the real motion of the system

In addition, although the change of size and direction of the tether in the process of transmitting the control force is considered, it is only considered as a disturbance and cannot reflect the real situation of the system motion

[0004] Through the above analysis, it can be found that the space tether modeling and simulation method of the stratospheric satellite system currently used has major defects, which will cause the simulation results to seriously deviate from the real motion of the system

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