基于移去-恢复技术的海洋垂线偏差插值算法

Marine vertical deflection interpolation algorithm based on remove-recovery method

海洋垂线偏差是惯性导航重力补偿不可或缺的基础信息,高精度的海洋垂线偏差插值算法是关键要件。联合海洋垂线偏差的空域分布特征和频域表征属性,基于移去-恢复技术对海洋垂线偏差插值算法进行了分析,以常用的反距离加权算法和Kriging算法为例,利用船载重力信息计算的垂线偏差数据和全球重力场模型EIGEN-6C4设计了仿真试验,结果表明,顾及频谱特性后,反距离加权算法精度能提高70%,Kriging算法精度能提高20%,验证了本文算法的有效性,可为高精度高分辨率的海洋垂线偏差模型构建提供技术支持。

Marine vertical deflection is the basic information of the gravity compensation in inertial navigation system,and the high precision interpolation algorithm of vertical deflection is key element.By combining spatial domain distribution characteristics and frequency domain representation attributes,the marine vertical deflection interpolation algorithm based on remove-recovery method has been analyzed.Taking commonly inverse distance weighting algorithm and Kriging algorithm as examples,the simulation experiment was designed using the earth gravity field model EIGEN-C4 and vertical deflection data computed by shipborne gravity data,The results indicated that when considered frequency domain representation attributes,the precision of Inverse distance weighting algorithm improved 70%and Kriging algorithm improved 20%.The effectiveness of the algorithm presented in this article has been verified,and it can provide technical support for the construction of high-precision and high-resolution marine vertical deflection model.