When the signals of GPS satellites are blocked,the GPS receiver can not accomplish its positioning calculation.In this paper,in order to solve the above mentioned problem,the series of receiver clock biases were regarded as a visible satellite and utilized to augment the GPS receiver for positioning calculation.The basic ideas and implementation steps of the lcock bias forecasting model were expounded respectively.The forecasted clock bias values introduced into the GPS receiver to realize incomplete constellation positioning. Verification of measured GPS Data shows that the clock bias forecasting model has very good predictive power for the series of receiver clock biases and the augmented positioning method can achieve 3-D positioning under the condition that only three GPS satellites are observable.%为了解决在 GPS卫星信号被遮挡而无法定位的问题，提出了一种利用钟差预测模型辅助 GPS定位的方法。对预测模型的基本思想和具体实现步骤作了详细的介绍，并且将钟差预测值引入到 GPS接收机中，实现信号遮挡情况下 GPS接收机的定位解算。通过对实测数据的验证分析表明，该钟差预测模型对钟差序列有很好的预测效果；能够在仅有3颗可观测卫星的情况下实现接收机的定位解算。
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