真近点角公式的推算

计算观测瞬间卫星的真近点角即求角vcossin1cosEeveE2sin1cos1cosEeveE2sin1tancosEevacrEe首先根据圆的参数方程cossinxaya我们可知点x的坐标为（acosE,asinE）根据椭圆的参数方程cossinxaybq可知点p的坐标为（acosE,bsinE）cea222bac根据图中可知s坐标为(c,o)sinsinpqaEbEcossqaEc222(cos)sinspaEcbE22222cos2cossinaEacEcbE2222cos(1sin)aacEcE2(cos)acEcosspacE22sinsin1sin1sinsincoscos1cospqaEbEaeEeEvspaEacEeEcoscoscoscos1cossqaEcEevspacEeE221sinsin1sin1costancoscoscos1coseEveEeEvEevEeeE所以21sintancoseEvarEe