采用数值微商求偏导数的方法，从而使GPS网平差的计算模型非常简洁。
The numerical partial derivative is introduced to simplify the GPS network adjustment model.
本程序适用于三角网、边角混合网的平差计算，适应性强，运算也较方便。
The new method, which is both adaptable and convenient, may be used in triangulation adjustment, and triangulateration adjustment as well.
通过与自由网平差结果对比表明，两种平差计算得到的单位权中误差相差不大，近似相等。
Compare to the free net adjustment result, these two unit weighted errors are closely approximated.
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