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This paper presents the guidance algorithms of chase spacecraft for autonomous proximity to target spacecraft. The process of autonomous proximity is initially divided into three phases including proximity maneuver, fly-around maneuver and final approach. Based on the Hill equation, the characteristic of each phase is analyzed and then the criteria to design guidance algorithm is proposed. Then, the...
That the computation load is big is a shortcoming of traditional BP decoding algorithm. According to this shortcoming we give an improved BP decoding algorithm. The decoding algorithm in the iterative decoding process, only need to update the possibility of a wrong bit of information without having to update the information whose reliability is very high, raises the decoding efficiency and reduces...
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