| Ultrashort-wave communication is good at channel condition,quality and far distance. Ultrashort-wave radio station is used by military communications,geological disaster control,flood-forecasting and so many systems. But, since the technology is complicated,how to diagnose and maintain ultrashort-wave radio stationi's fault have accepted a very big restraint.The cost of training rise and the safty of the personnel and equipment come down have became a problem. The thesis is adopt to resolve this difficult problem by simulating with software to replace hardware operating.This thesis introduces the fault diagnose theory and content of Pspice. It studies the principle of ultrashort-wave radio station.The emphasis is to analyze its units of transmiter and receiver. The transmit part maily carries out modulation , amplification and filtering of receipt signal.The receive part carries out amplification ,filtering and FM demodulation of sending signal mainly.The thesis found simulation models of circuits in units of transmiter and receiver and puts forward a new measure about how to import fault and how to perform fault diagnosis in the PSpice simulation . This thesis also shows the ultrashort-wave radio station circuit fault diagnosis simulation principle graphic. With fault tree analysis method and computer programming technology,fault diagnosis database is founded.It will be propitious to solve technology difficulty of ultrashort-wave radio station using , conquer complex technic and ensureing problem.It will fill up the blankness of equipment repairing ,circuit simulation and maintenance for new equipment .It also can be foundation of improving on the ultrashort-wave radio station.By examples,This thesis proves that performing fault diagnosis in the PSpice simulation is conveniency and feasible.Finally, this thesis sums up the whole work and discusses the existing problem of research and the development in the future. |
