简要介绍了GPS双频精密单点定位数学模型及自主研制的精密单点定位软件。

The mathematic model of GPS dual-frequency precise point positioning and the corresponding program named "GPS-PPP" recently developed by the author were presented.

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针对某卫星导航定位系统，着重研究了建立增强型接收机多模定位数学模型的方法，并讨论了定位解算的步骤。

The creation of the mathematical model for the Augmented Satellite Navigation Receiver is mainly researched and the steps of calculation are also discussed.

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