水下重力辅助导航中重力测量误差改正研究  

Study on error correction of gravity surveying in underwater gravity aided navigation system

作　　者：郭秋英[1] 徐遵义[2] 

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]山东建筑大学计算机科学与技术学院,济南250101

出　　处：《地球物理学进展》2012年第3期1274-1279,共6页Progress in Geophysics

基　　金：国家自然基金项目(60972052)资助

摘　　要：重力辅助惯性导航系统是未来水下载体导航的重要方式,实时提供重力测量数据是实现水下载体重力辅助导航的关键技术之一.详细探讨了水下载体重力观测数据的厄特弗斯改正和水平扰动加速度改正的数学模型,通过仿真计算分析了载体的位置、航向角和速度误差对厄特弗斯改正精度的影响.仿真结果表明,航向角误差和速度误差对厄特弗斯改正的影响较大;当V=8节、φ=30°时,载体向北航行时,0.5°的航向角误差造成的厄特弗斯改正误差约0.5mGal,载体向东航行时,0.1节的速度误差造成的厄特弗斯改正误差约0.6mGal;要保证厄特弗斯改正精度在±1mGal以内,则要求航向角误差在±1°以内,且航速测量误差在±0.1节以内.Gravity aided INS navigation is the important navigation method for underwater vehicle in the future. Real-time providing high precision gravity data is one of the key techniques. Eotvos correction model and horizontal acceleration correction model for gravity observation data were discussed in detail. Based on simulation computing,the effect of latitude, heading angle and velocity errors on the Eotvos correction was analyzed. The simulation results show that heading angle error and velocity error have greater influence on the error of Eotvos correction, and when V= 8nmile/h, φ= 30°,A= 0°, 0. 5° heading angle error can cause about 0.5 mGal Eotvos correction error,when V= 8nmile/h, φ= 30°,A= 90°, 0. lnmile/h velocity error can cause about 0, 6 mGal EStv6s correction error. If the precision of Eotvos correction is less than 4-1 regal, the heading angle error should be less than 1°and velocity error should be less than 0. lnmile/h.

关 键 词：水下运载体 重力辅助惯性导航 厄特弗斯改正 水平加速度扰动 

分 类 号：P631[天文地球—地质矿产勘探]