What are the working principles of DGPS?

In this blog, I discussed some of the working principles of  DGPS(Differential global positioning system)

The following are the working principles of  DGPS:- 

1. The position is determined by the distance from at least five satellites in differential GPS. 
2. The satellite-to-antenna signal travel time establishes the distance. 
3. Base station calculations are based on the difference between the location's stated coordinates and those provided by the spacecraft. 
4. The base station sends a signal to the DGPS receiver or rover constantly in this differential. 
5. The rover precisely pinpoints its location using this similar difference.