位置差分法

介绍一种新的差分GPS方法，既位置差分法。

A new DGPS method position DGPS is introduced in the paper .

利用飞机实测的数据进行了计算，验证了该方法的可行性及有效性。6.分析了位置差分法、原始多普勒观测值法和相位时序差分法等三种常用的GPS测速方法。

Through calculation of the aircraft observed data , the result proved the feasibility and the validity of the new method.6.Analyzing the position difference method , the primitive Doppler observation method and phase time differential method these three kinds of method which is commonly used in velocity calculation .

主要研究工作如下：首先，分析了传统的增量式光电编码器测速方法以及基于绝对式编码器的位置差分测速法。然后在位置差分法的基础上做了改进&周期重叠式测速法。

Research work is as follows : First , analyzed basic principles and methods of traditional speed measurement based on incremental optoelectronic encoder , and position-difference method based on absolute-type encoder .