How to calibrate the reference point of gps measuring instrument

1, principle of GPS measurement. When the GPS measuring instrument receives three or more navigation satellite signals, it can calculate the geodetic coordinate position where the measuring instrument (GPS receiver) is located, and when it receives four or more satellite signals, it can also calculate the height.

2.GPS global positioning system is divided into space part, control part and user part. There are usually 24 satellites and backup satellites in the space section, and there are 6 satellite orbital planes with an included angle of 60 degrees, and there are 4 satellites in each orbital plane. Each satellite runs in an orbit at an altitude of 20,200 kilometers 12 hours every day, and all points in the world can receive signals from 5 to 12 satellites.

3. The picture below shows the satellite constellation of GPS.

4. Use GPS measuring instrument (receiver) for positioning, click the mark to record the current position, and the latitude and longitude information format of GPS measuring instrument can be adjusted to hddd, mm, ss (degrees, minutes and seconds).

5. Use GPS measuring instrument (receiver) for ranging. When MARK is in the first position, GPS generates waypoint A and saves the information of A.. When you reach the second location, mark again to generate waypoint B. Then click Go, select waypoint A and confirm to calculate the distance from current waypoint B to the first waypoint A. ..

Hope to adopt! !