GPS水准精密高程测量关键技术

基于影响GPS水准精密高程测量的2个重要因素:对流层折射和GPS高程转换,介绍了对流层折射模拟的方法,主要有单参数法、随机过程方法和随机过程的分段线性方法.实例分析表明,随机过程的分段线性方法模拟效果较好;GPS高程转换常用数学模型拟合法和神经网络方法,提出了二次曲面拟合法与BP神经网络方法相结合的混合转换法,工程实例应用说明,该方法应用效果良好.

Key techniques of precise GPS height surveying

The tropospheric refraction and GPS height transformation are the two important factors that influence the accuracy of precise GPS height surveying.The estimation methods for tropospheric delay,such as the single parameter method,the stochastic process method and the piece-wise linear method,are introduced.The analysis of an example shows that the piece-wise linear method is better than the other methods.Based on the conicoid fitting method and the neural network method,which are usually used for transforming GPS height,the mixed method,which combines the two methods,is put forward.An application example shows that the mixed method is good for transforming GPS height to normal height.