同轴电缆测量纳秒脉冲信号衰减的数字补偿  

Numerical compensation for coaxial cable signal degradation

作　　者：付佳斌[1] 卿燕玲[1] 卫兵[1] 杨礼兵[1] 丰树平[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2011年第10期2826-2830,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10635050)

摘　　要：为了减小较长的信号传输电缆对纳秒量级前沿测量信号波形的畸变,提出了一种同轴电缆信号衰减数字补偿的方法。该方法利用信号在电缆中传输的衰减特性,结合标定或者扫频所得频响进行拟合,得到电缆的频响特性函数,再对电缆的出口信号进行反补,可以重建入口信号。经过实验验证,此补偿方法可以明显改善信号传输系统的频响特性,对于实验中的100m的SYV-50-7-2同轴电缆,补偿前传输带宽-3dB约在40MHz处,补偿后传输带宽约为1GHz。A numerical compensation method is proposed to reduce nanosecond signal distortion caused by tens meters of cable.The method calibrates the target cable with a relatively short cable,performs Fourier transform on the output signals of the two cables,and then gets the original function of the long cable sensitivity and phase with frequency,by using the frequency characteristics of the signals.For this original function is full of noise,it needs to be the fitted with system model.And then the cable＇s output signal can be compensated after the experiment signal being measured in frequency domain.The experiment shows that this method can improve the bandwidth of cable significantly.The 100 m-long SYV-50-7-2 cable whose bandwidth is just 40 MHz is improved to 1 GHz by compensation.

关 键 词：纳秒脉冲 同轴电缆 信号衰减 数字补偿 傅里叶变换 频响特性 

分 类 号：TM873[电气工程—高电压与绝缘技术]