Multi-sensor precise positioning method of space three-body system under tether constraints

Abstract

The invention provides a multi-sensor precise positioning method of a space three-body system under tether constraints. A research is performed by using a closed rotating triangular tethered satelliteformation system as a model, and sensor data of a spaceborne global positioning system in each satellite of the formation system are obtained at first; and a state equation is established according to a tethered system dynamic model, the tether constraints are added to an observation equation, and output signals of a plurality of sensors of the global positioning system are fused based on an extended Kalman filter. Compared with the conventional multi-sensor data fusion method, the method has advantages in the following aspects: (1) the physical constraints of the system are added to a data fusion model in the method, so that the effect of multi-sensor data fusion can be effectively improved; and (2) by adopting the method, a plurality of low-cost and low-precision GPS sensors can be combined to achieve high-precision positioning through data fusion.

Description

Technical field [0001] The invention relates to a multi-sensor data fusion processing method based on a global positioning system, in particular to a multi-sensor precise positioning method based on extended Kalman filtering of a space three-body system under the constraint of an elastic tether. Background technique [0002] Space tethers have significant advantages in flexibility, life cycle and functional expansion, and have become one of the research hotspots in the aerospace field at home and abroad in recent years. The space three-body system is a closed-loop new space system formed by connecting spacecraft one by one by three space tethers. It has begun to play a role in scientific experiments, space resource exploration, earth observation, and space attack and defense tasks. Application prospects. [0003] Real-time high-precision spacecraft positioning technology is not only an important technical guarantee for real-time monitoring and tracking of spacecraft, but also the ...

AI Technical Summary

Problems solved by technology

However, the positioning technology of the global positioning system still has key problems such as limited positioning accuracy and low calculation efficiency of the algorithm, so a variety of positioning methods of the global positioning system have been produced: (1) an independent calculation method using the global positioning system alone for positioning ; (2) Filter positioning algorithms that combine GPS measurement information with spacecraft attitude and motion information or other sensor measurement information, but these methods still have many limitations in spacecraft applications

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