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DOP是评估卫星导航定位性能的重要手段之一。在分析GDOP的数学意义和测量意义的基础上,提出两种GDOP最小值的求解方法,并对最小值进行理论分析。结果表明,传统场合中认为DOP为"精度衰减"因子是有局限性的;随着卫星与用户几何关系的改变,包括GDOP在内的所有DOP完全可以小于1,从而具有一定的精度增强作用。在此基础上,提出一种评价星座空间分布均匀程度的星座几何构型品质因数,并以GPS和Galileo星座为例进行试验,结果表明该因数可以较好地评价星座的空间分布均匀程度。基于GPS星座在近地空间内导航精度性能的试验结果很好地证明了DOP具有精度增强的属性。 更多还原

【Abstract】 The DOP is one of the ways to assessment the performance of satellite navigation and positioning.Based on the mathematical and surveying meanings of GDOP,two methods to get the minimum of GDOP were given,and the study on the minimum was made theoretically.The conclusion was drawn that,the traditional idea that DOP is just a factor to decrease the navigation & positioning precision was limited,since all DOPs including GDOP would certainly be less than one and improve the precision as a result... 更多还原