西安石油大学学报（自然科学版）2024，Vol.39Issue(4)：90-97,8.DOI:10.3969/j.issn.1673-064X.2024.04.013
一种基于改进CORDIC算法的阵列侧向测井仪信号发生电路
A Signal Generation Circuit for Array Lateral Logging Tool Based on Improved CORDIC Algorithm
摘要
Abstract
Array logging tool is a powerful tool for detecting and analyzing complex geological structures in logging engineering at pres-ent.In order to realize the"array"logging with five different detection depths,the logging instrument itself needs to generate five high-precision sinusoidal signals with different frequencies at the same time.In this paper,the classical CORDIC algorithm was improved and optimized.The calculation amount of the improved algorithm is only about one third of that of the classical algorithm,which greatly re-duces the output delay of DDS signal generator circuit.After the feasibility of the improved algorithm was verified by Modelsim software simulation,a signal generation circuit for array lateral logging tool based on DDS technology was designed and implemented by using FP-GA chip programming,with DA/C and low-pass filter circuit.The external scale simulation test of the instrument shows that the array lateral instrument equipped with the signal generation circuit can keep a good consistency in the resistance range of 0.6 Ω～100 kΩ,whose actual measurement error of the resistance in five modes is all kept within 10％,and the measurement accuracy of the simulated formations with medium-low resistance reaches 3％,which is obviously improved compared with the previous generation array lateral in-strument.关键词
CORDIC算法/DDS技术/阵列侧向测井仪/FPGA/信号发生电路Key words
CORDIC algorithm/DDS technology/array lateral logging tool/FPGA/signal generating circuit分类
能源科技引用本文复制引用
李东航,高怡,曹景致..一种基于改进CORDIC算法的阵列侧向测井仪信号发生电路[J].西安石油大学学报（自然科学版）,2024,39(4):90-97,8.基金项目
国家自然科学基金(51604226) （51604226）
西安石油大学研究生创新与实践能力培养计划项目(YCS22113107) （YCS22113107）
