这篇文稿提出“等效窗口法”评估卫星测高重力异常的空间分辨率与精度。方法基于实测船载重力测线与卫星测高数据互差，通过计算不同平滑窗口下的标准差，拟合极小值点作为“航段等效窗口”，反映卫星数据对应的空间分辨率。研究利用西太平洋海域45.1万km船测数据（3357个航段）与英国EGM和美国SS22两种卫星测高模型对比，统计结果表明：EGM数据等效窗口约10.6—11.0km，SS22约8.3—9.4km，两者精度均约2mGal，且具有各向同性特征。结论认为，当时卫星测高重力异常数据可满足1:100万比例尺、5mGal等值线距空间重力异常图的编图需求。附录给出了三观测列方差分解法的推导过程，用以分离船测与卫星数据的各自精度。该方法为卫星重力数据质量评价提供了实用技术手段。
This paper presents the "Equivalent Window Method" for evaluating the spatial resolution and accuracy of satellite altimetry-derived gravity anomalies. The method compares shipborne gravity data with satellite altimetry data, computes standard deviations under different smoothing window sizes, and determines the minimum point of the fitted curve as the "segment equivalent window." Using 451,000 km of shipborne data (3,357 segments) from the Western Pacific and two satellite models (UK EGM and US SS22), the results show that EGM data correspond to ~10.6–11.0 km equivalent windows, SS22 to ~8.3–9.4 km, with both achieving ~2 mGal accuracy and showing isotropic characteristics. The study concludes that such satellite data can support 1:1,000,000-scale mapping with 5 mGal contour intervals. The appendix details the three-observation-set variance decomposition method used to separate shipborne and satellite data errors.
引用信息：雷受旻, 2014,用等效窗口法评估卫星测高重力异常分辨率, doi:10.12079/blc.geo20140815