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kexing46

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shawmar(金币+25, 翻译EPI+1): 不专业 2012-03-01 17:10:09
爱与雨下(金币+1): 2012-03-01 19:57:40
Mally89(金币+5): 代lz发放BB！~感谢应助！~欢迎常来！~ 2012-03-10 18:47:06

traditional ways to examine the problem of electric cable include bridge method,time domain reflection method and frequency domain reflection method,but those methods must be applied off-line,so they can't detect intermittent problems of short time.Sequantial time domain reflectometry and extended frequency domain reflection make on-line detecting possible.Still,the space resolution of this two methods are limited by code rate of the pseudo-random code,not only the expensive high speed pseudo-random code generator is required if you need to improve resolution,but also false-alarm and erroneous judgement are brought in with the periodicity of the pseudo-random code.

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