It is clearly clarified the conceptions of quadrature modulation, quadrature exciting, quadrature receiving, and quadrature demodulation in the MRI system.

阐明了MRI系统中所使用的正交调制、正交解调、正交激发和正交接收的概念。

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After that, the article introduces the signal system as well as modulation and demodulation of Beidou satellite, next, explain the telegram form elaborately.

接着详细地介绍了北斗卫星的信号体制，对其调制解调方式作了深入地研究，对电文格式作了说明。

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This paper discusses the theory and the realization approach of BOC modulation and demodulation in satellite navigation system, and focuses on the BOC code tracking technology.

讨论了卫星导航中BOC调制解调的原理和实现方法，并着重研究了接收机的码跟踪技术。

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