航空重力测量数据之网平差探讨  

Discussion on the Net Adjustment for the Airborne Gravimetry Data

作　　者：聂国兴 王丽红 

机构地区：[1]第一测绘大队

出　　处：《测绘科学与工程》2011年第2期17-20,53,共5页Geomatics Science and Engineering

摘　　要：航空重力测量数据处理中的网平差计算是基于地面重力基准点值和交叉点（不符）值进行的平差计算。本文首先简要介绍了交叉点计算和网平差计算的方法和目的，然后结合某区域的实际数据分析了网平差计算对格网平均重力异常影响的量级。理论分析和实际数据验证均表明，在测定5′×5′格网平均重力异常时，网平差计算对空中格网的平均重力扰动影响小于0．5mGal，对地面格网的平均重力异常影响小于0．2mGal，对于3mGal-5mGal的格网精度要求可以不予计算，但对于更高格网精度要求的计算，网平差计算还是有意义的。The net adjustment processing for airborne gravimetry is based on the adjustment caculation of gravity of the ground datum marks and the differences of the surveying - line junctions. The methods of calculating junctions and net adjustments are introduced at first, then an example is given for analyzing the magnitude of net adjustment caculation＇ s influence on the grid mean gravity anomaly. The theoretic analysis and the test with actual data both indicate： for calculating five minutes grid mean gravity anomaly, the influence of net adjustment on airborne grid mean gravity disturbance is less than 0.5 regal, and the influence on the grid mean gravity anomaly on the earth＇ s surface is less than 0. 2 mgal. Meanwhile, according to the precision request of 3 to 5 mgal, the net adjustment should not be proceeded, but for the more accurate demand, the net adjustment is evidently necessary.

关 键 词：网平差 高差 空中格网平均重力扰动差 地面格网平均重力异常差 

分 类 号：P223[天文地球—大地测量学与测量工程]