| With frequency 350 MHz wireless simulcasting communication system is a fundamental system emergency communication,it is the public security work,one of the most important basic information platform in communication command in daily work of police,all kinds of important security activities and all kinds of emergency treatment plays an important role.In view of the new communications business development needs of police,public security wireless communication network must adopt advanced,practical,mature technology,has a long-term unified planning,overall construction of the public security network from the Angle of sustainable development.According to the guiding ideology of "science and technology police" as the development opportunity of police technology,it is the principle to realize the synchronous development of technology and public security communication.Now,take the practical application of liuzhou public security bureau in our district as an example,construct a set of 350MHz with the same frequency to broadcast the network,and guarantee the good coverage of the global command center.Paper respectively from 350MHz with the working principle of the frequency simulcasting analog and digital concept,on the basis of actual design a set of 350MHz with frequency with compatible digital simulation system,through the base station combining GPS with information technology and the CTCSS,solve the problem of same frequency with frequency interference in the broadcast,provide professional digital and analog of the same frequency and lock frequency and phase lock control,improve the effect of cut in anti-jamming.Second,the compatible with analog/digital frequency simulcasting function is studied,based on the research and development of PDT standards for design requirements of public security,realize the backward compatibility simulation and the frequency and the seeding,all hard software device can be directly converted into PDT digital of the same frequency and system. |
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