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1.引言随着宇宙飞行的发展,给宇宙通信带来了很多非常重要的问题。首先是精密跟踪系统的设计问题,和“统一系统”的,即能将所有基本信号组合起来而完成各种空间传输功能的系统的设计问题。与通信技术的其他应用一样,基本问题仍然是信号设计。“统一系统”用一套综合的飞行器射频
1. Introduction As the development of space flight has brought many very important issues to the cosmic communications. The first is the design of a precision tracking system, and the design of a “unified system,” a system that combines all the basic signals to accomplish a variety of spatial transmission functions. As with other applications of communication technology, the basic problem remains the signal design. The Unified System uses a comprehensive set of aircraft radios