| This article refers to the project design, equipment selection and achievement ofDTV front-end system construction. It first introduced the development backgroundof DTV front-end system, which proved its importance and necessity. Secondly, itdiscussed not only the whole front-end system in details but also the functionrequirements of each subsystem. At the end, it discussed the design and achievementof the overall structure and each module of front-end system, which includes thedesign and achievement of satellite receiving system, matrix system, multiplexer,modulator, radio frequency system, and the design of integrated network managementsystem.Based on this, through comparing and analyzing the equipment index parameters,the selection of front-end system main equipments are confirmed. According to theequipment feature, the test scheme of system function and program work flow aredesigned. This paper deeply analyzed the data collected by TS flow monitoring aids,which provides the relation between TS flow data and front-end system equipmentoperational conditions. This gives the system function test report and the main factorsinfluencing the video program quality. Through analyzing the typical cases ofcommissioning process, it proves that the design of the DTV front-end system isreasonable, the equipment selection is appropriate, the test scheme is consummate,which can meet the requirements of being each backup broadcast with another system.At the end, this paper concludes the overall running state and application status, basedon which, provides suggestions on further improvements and makes outlook on futureprospect of the system. |
