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代码说明：

说明：  滤波在 世纪 年代初一经提出，立即受到工程界，特别是空间技术和航空界的高度重 视。应用 滤波算法进行卫星轨道精密确定，必须首先构造可靠的卫星动力学模型和可靠的观 测模型以及合理的估计方法。(Filter was put forth in the 1750s and started immediately subject to the engineering sector, especially in space technology and attaches great importance to the aviation community. The application filtering algorithm precision determination of satellite orbit must first construct the the reliable satellite dynamics model and observation model, and the reasonable estimation method.)