海空重力测量关键技术指标体系论证与评估

Research and Evaluation on Key Technological Target System for Marine and Airborne Gravity Surveys

技术规程是开展海空重力测量作业的重要依据。针对我国现行海空重力测量规范或标准缺乏现势性的问题,开展了海空重力测量测线布设密度、测量精度、空间分辨率、海空重力仪零点漂移与动态重复性等关键性指标分析和论证,提出了由测点重力中误差、系统差和平均误差3个指标组成的测量精度评估体系,以及由格值标定相对精度、零点月漂移量、月漂移非线性变化中误差和月漂移非线性变化限差4个指标组成的海空重力仪稳定性评估体系,给出了相关技术指标的验证和评估方法,同时对涉及船载重力测量测点归算、航空重力测量厄特沃什改正、测量平台倾斜改正及海空重力测量精度评估等关键性数学模型进行了分析和改进,旨在为下一步启动军民融合海空重力测量作业规程编制工作提供技术支撑。

Technological standard is an important scientific basis for marine and airborne gravity surveys. In accordance with the lack of the present specifications to reflect the trend of the times for marine and airborne gravity surveys, a detail analysis and research is made on key targets, such as the density of surveying line layout, survey accuracy, space resolution, zero drift and dynamic repeatability of air-sea gravimeter,etc. An evaluation system of survey accuracy targets including root mean square of errors （RMS）,systematic error and mean error for marine and airborne gravity surveys is suggested. And an evaluation system of stability targets including calibration accuracy of scale value, total month zero drift, RMS of nonlinear month drift and limited deviation of nonlinear month drift is proposed. The methods of testing and evaluating the above technological targets are introduced. And some key mathematic models about reduction of observed values for marine gravity survey,Eotvos correction for airborne gravimetry, platform tilt correction and evaluation of survey accuracy for air-sea-borne gravimetry are analyzed and modified. The obtained conclusions provide useful theoretical support for the revision of existing specifications for future civil-military inosculation of marine and airborne gravity surveys.