摘要
高分辨率感应测井仪 (HRI)是一种正在研制的应用感应原理测量地层电阻率的精密仪器 .它在信息处理方面采用数字相敏检波法分离接收信号的实部和虚部 ;在硬件实现上采用数字运算能力强大的 DSP和高速高精度 (1 6 Bit,5 70 k SPS) A/D,还利用 FPGA(现场可编程门阵列 )控制所有的时序和工作状态 ,采用同一时钟源 ,可以保证发射信号和接收信号绝对同步 ,而且没有累计误差 ,能够达到很高的精度 .针对高分辨率感应测井仪 (HRI)介绍了采用 FPGA的硬件实现方案 。
HRIT is an investigating precise instrument to be used for measuring formation resistance by applying induction theory. A scheme of its hardware realizing is introduced in this paper. In hardware, it uses DSP with strong digital calculating ability and A/D with high speed and high precision (16Bits, 570kSPS). It also uses FPGA to control all the time sequences and working conditions with the same clock. Those insure the absolute synchronization of transmitted signal and received signal, and there is not accumulative error. In dealing with information, it separates the real and image parts of received signal by digital phase sensitive demodulation.
出处
《西安石油学院学报（自然科学版）》
2003年第1期60-63,共4页
Journal of Xi'an Petroleum Institute（Natural Science Edition)
