摘要
UHF(ulatr-high-frequency)局放传感设备中,混频在保留信号相位和幅度细节以及抗干扰方面比包络检波更有优势,但下变频后实信号直接混频必然引入3dB镜像频谱干扰。为了解决干扰问题,采用Xilinx公司主流的zynq7系列作为局放处理器,设计了一套正交混频型局放设备软硬件,提出了一种新型数字正交混频干扰消除方法。与传统哈特利(Hartley)镜像频谱抑制算法在模拟域I、Q路合并方法相比,在zynq处理器内实现了一种通用型的数字移相器,将相位超前的Q路信号数字移相90°后,再与缓存的I路信号进行合并,可完全消除镜像频率干扰,与现有的实数直接相乘混频的局放接收机相比,整体上有3dB灵敏度增益,还降低了硬件成本和冷门电桥芯片采购难题。
For ultra-high-frequency partial discharge system,although mixer has some advantages in reserve signal amplitude and phase compared to envelop detector technique.Directly multiply two real signal mixer existed image spectrum interferences in pass band and would bring 3dB Signal-Noise-Rate lost.In order to overcome above problem,applying Xilinx newly zynq7 as PD main processor,connected high speed ADC to FPGA and two cortex-A9 cores finished digital signal process easily.Based on XC7Z015,provided a newly digital partial discharge orthogonal mixer interferences rejected method.Compared to Hartley analogy domain processing method,digital domain utilize field program gate array chip,implemented a digital phase shifter,then merged I,Q channel into one signal,this orthogonal frequency mixer brough 3dB SNR gain compare to older real mixer.At the same time,UHF receiver avoid circuit bridge integrated chip purchase problem and lower hardware cost.
作者
周寒冰
张传远
马晓昆
王丹丹
王永贵
刘柱
ZHOU Han-bing;ZHANG Chuan-yuan;MA Xiao-kun;WANG Dan-dan;WANG Yong-gui;LIU Zhu(Beijing Guodiantong Networks Technology Co.,Ltd.,Beijing 100192,China;State Grid Information Telecommunications Group Institution,Beijing 100192,China)
出处
《计算技术与自动化》
2022年第2期40-45,共6页
Computing Technology and Automation
基金
国网信息通信产业集团有限公司两级协同研发重点项目(546806200004)。
关键词
信号调理
正交混频
镜像干扰抑制
局放
zynq7
SOC
signal conditional
orthogonal frequency mixer
image interference rejected
partial discharge
zynq7 SOC
