摘要
潜艇在水下进行重力梯度探测与导航过程中,利用重力梯度仪测量所在位置的重力梯度张量来感知周边海底地形起伏以及规避障碍物,由于潜艇中人员具有一定的质量,人员在理论上会对重力梯度测量值产生影响。为分析人员质量对重力梯度测量的影响,将人体简化为立方体模型,计算人体在潜艇内不同高度处的重力梯度异常分布情况,分析其对重力梯度探测的影响,并将计算得到的结果与质点模型的结果对比分析得到两者的差异。结果表明在距离人体5 m以内的大部分位置上,重力梯度各分量的量级能达到10-2E,在更近的位置上梯度值的量级能达到10E,为防止对重力梯度仪测量结果产生影响,人员需要在距离梯度仪一定的距离外活动,随着精度的提高,限制距离将会增大。本文得出的结论可为以后重力梯度探测工程化应用提供一定的理论参考。
In the process of underwater gravity gradient detection and navigation, the submarine uses gravity gradiometer to measure the gravity gradient tensor at its location to perceive the topographic fluctuation of the surrounding sea floor and avoid obstacles. Since the crew in the submarine has a certain mass, the crew will theoretically affect the gravity gradient measurement. In order to analyze the influence of the mass of crew on gravity gradient measurement, the crew body is simplified into a cube model to calculate the distribution of gravity gradient anomaly at different heights in the submarine. By analyzing its influence on the gravity gradient detection and comparing the calculated results with the results of particle model, the difference between the two.Is obtained the results show that the magnitude of each component of gravity gradient can reach 10-2E at most positions within 5 meters from the crew body and 10 E at some closer positions. In order to prevent the influence on the measurement results of the gravity gradiometer, the crew needs to move beyond a certain distance from the gradiometer. With the improvement of the accuracy of the gravity gradiometer, the limited distance will increase. The conclusion can provide a theoretical reference for the engineering application of gravity gradient detection in the future.
作者
贤鹏飞
纪兵
刘备
XIAN Pengfei;JI Bing;LIU Bei(Department of Navigation,Naval University of Engineering,Wuhan 430033,China)
出处
《海洋测绘》
CSCD
北大核心
2021年第3期32-36,共5页
Hydrographic Surveying and Charting
基金
国家自然科学基金(41874091)
海军工程大学自主立项项目(2020504210)。
关键词
重力梯度
水下探测
人体影响
立方体模型
质点模型
gravity gradient
underwater detection
crew influence
cube model
particle model
