海洋重力仪稳定性测试与零点漂移问题

稳定性指标是海洋重力仪最重要的技术特性之一。针对国内对海洋重力仪稳定性测试与评估重视不够、数据处理过程欠规范、技术指标要求欠细化等现实问题,研究探讨了海洋重力仪稳定性测评的技术流程和数据处理方法,重点分析了环境因素和重力固体潮效应对测试结果的影响,提出了重力仪零点趋势性漂移、有色观测噪声与随机误差的分离方法,建立了比较完善的海洋重力仪稳定性评估指标体系,分析论证并进一步明确了重力仪零点漂移非线性变化的限定指标要求,为修订现行海洋重力测量作业标准提供了可靠的理论依据。

Test and Evaluation of the Stability for Marine Gravimeter and Its Zero Drif

Stability is one of the most important technical features of marine gravimeter.Scholars in our country do not pay much attention to the test and evaluation of stability for marine gravimeters.So the method of data processing for stability evaluation is not normal,and the requirements of technical features are not clear and definite.In this paper,the technological process for the test and evaluation of stability of marine gravimeters is discussed in detail.The analysis is focused on the influences of surrounding elements and gravity tides on the test results.A method of separating linear drift,colored noise and random error from total zero drift is proposed.And a perfect evaluation system of the stability for marine gravimeters is suggested.The quantitative requirement of limitation to the nonlinear drift is analyzed and investigated.Some clear and definite conclusions are obtained,which offer useful theoretical support for the revision of existing specifications for marine gravity surveys.