海洋绝对重力仪干涉信号高速采集系统设计  

Design of High-speed Acquisition System for Interference Signals of Marine Absolute Gravimeter

作　　者：胡若 张华帅 李春剑[1,2] 李清孟 王启宇 冯金扬 吴书清[1,2] HU Ruo;ZHANG Huashuai;LI Chunjian;LI Qingmeng;WANG Qiyu;FENG Jinyang;WU Shuqing(National Institute of Metrology,China,Beijing 100029;Key Laboratory of Time-Frequency and Gravity Metrology Benchmarks of the State Administration for Market Regulation,Beijing 100029;Beijing Zhongji Kaiyuan Science and Technology Co.,Ltd,Beijing 100013;College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590)

机构地区：[1]中国计量科学研究院,北京100029 [2]国家市场监管总局时间频率与重力计量基准重点实验室,北京100029 [3]北京中计开元科技有限公司,北京100013 [4]山东科技大学电气与自动化工程学院,青岛266590

出　　处：《导航与控制》2024年第5期114-120,共7页Navigation and Control

基　　金：国家重点研发计划(编号:2022YFF0607504)。

摘　　要：海洋绝对重力仪是对当前基于相对测量原理的海洋重力仪进行现场校准的计量器具,针对海洋绝对重力仪具有高精度高频次的测量特点,提出了一种基于FPGA的干涉信号高速采集系统软硬件设计方案,完成了高精度模数转换器、调理运放电路等硬件电路的选型和设计,使用Verilog实现了数据传输等模块的逻辑控制。然后,采用C#语言开发了一套功能完善可视化程度高的上位机,实现重力数据的处理与解算。最后,基于海洋绝对重力仪搭建了实测系统性能试验测试平台。试验结果显示,200次绝对重力测量所得重力标准差为0.6 mGal,A类不确定度为42.4μGal。所设计的采集系统满足海洋绝对重力仪高频次的测量要求与毫伽量级的测量精度,研究成果可为海洋绝对重力的有效测量提供保障。The ocean absolute gravimeter is a metrological instrument for the on-site calibration of current marine gravimeters based on the principle of relative measurements.A software and hardware design scheme for a high-speed interference signal acquisition system based on field programmable gate array(FPGA)is proposed to address the measurement characteristics of high-precision and high-frequency ocean absolute gravimeters.The selection and design of hardware circuits such as high-precision analog-to-digital converter conditioning and operational amplifier circuits have been completed.The logic control of USB3.0 data high-speed transmission module is realized by Verilog hardware description language.Then,a host computer with perfect functions and high visualization degree is developed by C#language to realize the processing and solving of gravity data.Finally,the test platform of the measured signal system is built based on the ocean absolute gravimeter.The test results show that the standard deviation of gravity obtained from 200 times absolute gravity measurements is 0.6 mGal and the class A uncertainty is 42.4μGal.The designed acquisition system can meet the requirements of high frequency and mGal measurement accuracy of marine absolute gravimeter,and the research results can provide guarantee for the effective measurement of marine absolute gravity.

关 键 词：海洋绝对重力仪 高速采集系统 高频次绝对重力测量 现场可编程门阵列 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]