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GNSS positioning accuracy index calculation
2022-07-06 12:54:00 【Proletarians】
According to whether there is a reference point ( Truth value ), There are two calculation methods .
Mode one : No truth value
No truth value , Then the calculation is the internal coincidence accuracy —— Positioning deviation (position deviation);
Because there is no external reference , Therefore, the average value should be used for data analysis center.
The most important thing is to change the coordinate system into ENU, Again according to deviation Formula of , It is divided into 2D and 3D In the form of .
Mode two : True value
True value , Explain that there are external references , It is necessary to calculate center From the average value to the true value point . At this point, you can calculate CEP50,CEP95,RMS Three indicators ;
1、CEP50 and CEP95
stay BLH In a coordinate system , Among them, we need to use the knowledge of geodesic , Sort the calculated distance , take 50% or 95% that will do .
2、RMS
In the plane , stay ENU Calculate in the coordinate system ; On elevation , stay BLH Coordinate system .
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