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《Journal of Detection & Control》 2010-05
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Linear Spline Combination Interpolation of Geomagnetic Map for Attitude Detection

LIU Jianjing,ZHANG He,CHENG Xiang(ZNDY of Ministerial Key Laboratory,NUST,Nanjing 210094,China)  
To solve the problem of low accuracy of geomagnetic map with bilinear interpolation,according to the character of the field intensity which changes fast along longitude line and slowly along latitude line,the linear spline combination interpolation was put forward.The interpolation method adopted cubic periodic spline interpolation along the longitude line and linear interpolation along the latitude line.With the IGRF model,the simulation and analysis of combination interpolation showed that the linear spline combination interpolation only took seven additions and seven multiplications to calculate a geomagnetic component.And its accuracy was more than one time as high as that of bilinear interpolation.
【CateGory Index】: TJ410.6
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