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首先给出四阶五次样条函数空间的基础解系,由此得到四阶五次均匀B样条空间一组线性无关的基函数,在此基础上给出具有两个独立形状参数的四阶均匀B样条函数,定义了具有两个独立形状参数的多项式曲线,此曲线以三次均匀B样条曲线为特殊情况,具有与三次均匀B样条曲线相同的端点性质和连续性,同时扩大了调节曲线形状的范围,使曲线调节更加灵活多样. 相似文献
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The China Gravity Basic Net 1985 (CGBN85) which comprises 57 gravity stations, including 6 absolute gravity stations, was measured with LaCoste & Romberg gravimeter model G (LCR-G). Precise relative connections were also made between CGBN85 and several existing international standards. A whole adjustment was made by applying the parameter adjustment method, taking scale functions for each LCR-G meter into account. The nationwide new CGBN85 with an average internal accuracy ±8μGal [10~(-8)ms~(-2)] was then established and has been used, since its official appraisal, in gravimetric practices for two years. This shows that CGBN85 meets the requirements of modern earth sciences. 相似文献