大气传播延迟改正在GAMIT软件中的应用

卫星信号从GPS卫星发射到地面的过程中经过了以充满大气为介质的空间,电磁波在这种变化的介质中传播,其传播的方向、速度、强度都可能随时改变,本文简略地介绍了大气传播延迟的产生及其对GPS测量的影响,并就GAMIT软件对大气传播延迟的控制方法和所采用的改正模型做一简单介绍,并对减弱和消除大气传播延迟的方法和手段进行了讨论。

Applications of the atmospheric propagation delay to the GAMIT software

As the GPS signal travels from the GPS satellite to the receiver, it propagates through the atmosphere of the earth, where it is retarded and its path changed from a straight line to a curved one. If we take the simplified mathematical model for the observable to be one in which the sig nal is assumed to be propagating in a straight line and at the speed of light in vacuum, then the "atmospheric propag ation delay" is defined to be the difference between the true electrical path length and this assumed straig ht line length, and may be implemented in the GAM IT softw are. The present paper deals with the generation and effects of the atmospheric propagation delay on the GPS measurements, controls of the GAM IT softw are on the atmospheric propag ation delay, and methods for reducing and eliminating the multipath errors of the atmospheric propagation delay.