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《Electronic Measurement Technology》 2010-08
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Design of frequency meter based on CPLD and MSComm

Zhou Zhiliang Zhang Chuanjun Jing Xiaofeng Gao Xihui(No.5715 Factory of PLA,Luoyang 471000)  
In the test process of A-A missile radar seeker,In order to test performance index of acquisition and tracking to target doppler frequency,seeker of centerral frequency and doppler frequency are need to check real-time.Design methods of frequency meter are presented.The pretreatment circuit of frequency signals is given.Using CPLD EPM7128SLC frequency signals are counted,and count result are convert to asynchronous comunication datas from parallel datas.Later these datas are convert to RS232C by using MAX232 chip.Under the development environment of VC++6.0,Using MSComm ActiveX the application software is developed.It solve the problem of frequency measurement and real-time display well.
【CateGory Index】: TM935.13
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