重力梯度仪实验室动态精度评价方法及系统验证  

Laboratory dynamic accuracy evaluation method and system verification for gravity gradiometer

作　　者：李达[1,2] 李城锁 高巍[1] 张子山[1,3] 武莉[1] 李中 Li Da;Li Chengsuo;Gao Wei;Zhang Zishan;Wu Li;Li Zhong(Tianjin Navigation Instrument Research Institute,Tianjin 300131,China;College of Intelligent Systems Science and Engineering,Harbin Engineering University,Heilongjiang Harbin150001,China;Tianjin Key Laboratory of Quantum Precision Measurement Technology,Tianjin 300131,China)

机构地区：[1]天津航海仪器研究所,天津300131 [2]哈尔滨工程大学智能科学与工程学院,黑龙江哈尔滨150001 [3]天津市量子精密测量技术重点实验室,天津300131

出　　处：《地震科学进展》2024年第11期778-784,共7页Progress in Earthquake Sciences

基　　金：XXXX搭载测量与保障技术研究及应用试验(DD20230644)资助。

摘　　要：针对在动基座下可靠评价重力梯度仪测量精度的应用需求,提出了一种重力梯度仪实验室动态精度评价方法。首先,提出了一种近似均匀重力梯度环境的构建方法,通过长方体型质量体的对称分布在局部空间范围内形成近似均匀的重力梯度激励,激励幅值达到62.4 E,不均匀度优于1.3 E;其次,以重力梯度仪在实验室动态条件下能否敏感质量体移动产生的引力梯度激励为评价准则,提出了重力梯度仪实验室动态精度评价方法;最后,在实验室内通过重力梯度激励装置和六自由度运动模拟台搭建了重力梯度仪实验室动态精度评价系统,结合自研重力梯度仪开展了验证试验。试验结果表明,该评价系统具备在实验室内开展重力梯度仪动态测量精度的评测能力,能够满足国内在研动态重力梯度仪的评测需求。To meet the demand for reliably evaluating the measurement accuracy of the gravity gradiometer under dynamic conditions,a method for dynamically assessing the accuracy of the gravity gradiometer in a laboratory setting was proposed.Firstly,a method for creating an environment of approximately uniform gravity gradient was introduced.It involved the symmetric distribution of rectangular mass bodies within a localized spatial range to generate an approximately uniform gravity gradient excitation,with an excitation magnitude reaching 62.4 E and non-uniformity better than 1.3 E.Secondly,an evaluation criterion was proposed based on the gravity gradiometer’s sensitivity to gravity gradient excitation produced by the movement of mass bodies under dynamic laboratory conditions,leading to the proposal of a method for evaluating the dynamic accuracy of the gravity gradiometer in the laboratory.Finally,a laboratory dynamic accuracy evaluation system for the gravity gradiometer was established using a gravity gradient excitation device and a six-degree-of-freedom motion simulation platform.Validation experiments were conducted in the laboratory using a self-developed gravity gradiometer.The experimental results indicate that this evaluation system is capable of assessing the dynamic measurement accuracy of the gravity gradiometer in the laboratory,meeting the evaluation requirements for domestically developed dynamic gravity gradiometers.

关 键 词：重力梯度仪 均匀引力梯度激励 动态性能测试 

分 类 号：P315.6[天文地球—地震学]