Depending on the needs of your application you should to take into consideration the hardware capabilities, DGPS availability, and environmental factors when selecting a GPS system.
基于你应用程序的需要，在选择一个GPS系统的时候，需要考虑硬件的能力、DGPS的有效性和环境因素。
DGPS is used to effectively compensate for some errors in the GPS position solution, to improve its accuracy.
差分gps是一种十分有效的改进和提高GPS导航定位精度的方法。
Then, the troposphere pseudo-range remaining error (TDRE) of differential GPS (DGPS) is defined, its mathematical model is constructed, and the computer simulation of TDRE of DGPS is carried out.
定义了差分GPS（DGPS）的对流层伪距残差的概念，并建立了数学模型。 用计算机对DGPS的对流层伪距残差进行仿真。
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