一种无需考虑轨迹特征的交叉点确定方法  

A Method of Determining the Crossover Without Considering the Trajectory Characteristic

作　　者：王立伟[1] 张胜军[1] 郭明志[2] 鞠英博 

机构地区：[1]武汉大学测绘学院,武汉市珞喻路129号430079 [2]天津二十冶建设有限公司,天津市津塘公路十号桥300350 [3]黑龙江第二测绘工程院,哈尔滨市学院路2号150025

出　　处：《测绘地理信息》2015年第3期35-38,共4页Journal of Geomatics

基　　金：国家重点基础研究发展计划资助项目(2013CB733302);国家自然科学基金资助项目(41210006;41304003);高等学校博士学科点专项科研基金资助项目(20130141120002)

摘　　要：与以往利用对轨道进行二次多项式拟合或分段拟合求取交叉点的思路不同,提供了一种利用线段分段方式搜索交叉点,并最终采用短距离直线拟合确定交叉点的新思路。该方法可以不用顾及卫星下点轨迹的分布特征,使得交叉点的确定更为简便。在北冰洋区域的实验结果验证了该方法的正确性,所计算出的交叉点的不符值符合海冰的季节变化特点。Different from the previous ways that the crossover was computed by processing satellite orbits with second-order polynomial fitting or piecewise fitting methods, this paper puts forward a new method, which is searching the crossover segment-by-segment and finally determining it by linear fitting in the short distance. This method is simpler to determine the crossover without considering the distribution characteristics of the track of sub-satellite points. Experimental results of the Arctic Ocean area evidence the validity of the method, and the discrepancies in the computed crossover values correspond to the characteristics of the seasonal variations.

关 键 词：卫星测高 交叉点 线性内插 Cryo Sat_2 

分 类 号：P228.3[天文地球—大地测量学与测量工程]