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The power consumption of actuators is an important concern for the spacecraft attitude control system. This paper presents a power consumption reduction method for permanent magnet biased active magnetic bearings (AMBs) during torque output of control moment gyros (CMGs). For simplicity of analysis, a simple single degree-of-freedom (DOF) AMB system undergoing an external load force is first presented...
To improve the accuracy of spacecraft position determination, phase referencing technique had been introduced from radio astronomy. But the influencing factors of this new method in deep space navigation are still not very clear. This paper first gives a brief overview of the basic principle of the phase referencing technique, and then analyzes and simulates the effects of several main influencing...
To improve the positioning accuracy for deep space probes, this paper presents the basic principle of radio imaging firstly, and then establishes the phase referencing model for them. Phase referencing technique can determine the accurate location of a probe. Measured data of Cassini were analyzed to evaluate the feasibility and possible accuracy of it. The results show that the position accuracy...
Lunar relay satellite (LRS) constellation is required for the exploration of the back and polar region of the Moon. In order to provide high coverage performance, generally we choose high circular or elliptical orbits for the relay satellites. Elliptical orbit constellation needs the minimum number of satellites to provide continuous coverage of the Moon's south pole region. But the circular polar...
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