中文摘要：

对观测量进行高阶电离层改正,利用改正后的观测量求解卫星轨道和卫星钟差,根据所得的卫星轨道和卫星钟差来计算其余测站的对流层。结果显示,二阶电离层在低纬度地区很容易达到1cm,可使对流层引起2~3mm的误差。而三阶电离层在低纬度地区一般不超过5mm,对对流层的影响不会超过0.5mm。数据测试表明,要获取1mm精度的对流层,中低纬度地区的二阶电离层必须进行改正,而三阶电离层可以忽略不计。

英文摘要：

Corrected by high-order ionospheric delay, observations are used to estimate satellite orbits and clocks. And the other site＇s tropospheric delay is calculated by these orbits and cloc sults show that it is easy to reach lcm value in the second-order ionosphere at low latitude can cause 2-3 mm error to troposphere es cannot exceed 5 mm at low latitude areas. ks. The re areas timation. But the third-order ionosphere estimation A data test implies that if 1 mm precision of tropos ty ph This pically ere estimation is desirable, then the site＇s second-order ionosphere computation must be corrected in middle and low latitude areas. Since the third-order ionosphere computation effect on troposphere estimation is very small, it can be safely neglected.