Design Of The Control System Ⅱ For1KW CMMB Transmitter

With the development of information technology, the requirement oftransmitter in automatic and intelligent is unceasingly improved. The stable andreliable work of the transmitter control system, which is the core of thetransmitter, is very important for the transmitter to improve the broadcast qualityand efficiency.Based on the understanding of the work characteristics and technicalrequirements about1KW CMMB transmitter, the functional characteristics ofthe transmitter control system were analyzed. The structure of the main controlunit in the transmitter control system was determined, ARM was selected as thecore processor of the control system, and the touch screen was used as theman-machine interactive equipment to make the system humanity andconvenient for operating; the hardware circuit such as storage circuit, serialcommunication circuit and other related interface circuit etc was designed andrealized.The programming idea of structuration and modularity was applied in thedesign of the control system software, and the hierarchical framework was alsoused. The program such as man-machine interface, data storage, communication,timing on/off and protection were designed and realized, which could meet thedemand of the control for transmitter, and could realize functions such asreal-time display of working state and parameters, management and control ofthe transmitter for working-person, automatic switch on/off, data transmission,self protection of the transmitter when has fault.The test in laboratory and working field shows that the control system fortransmitter can satisfy the requirement of working stably for a long time, andhave high reliability and real-time ability.