Actually I am doing an RF measurement and this includes phase and power. i generate a list of powers ranging for example from (-50 to 40) dBm, while the phase rotate to make it for example spiral shape as shown in the attached graph. Then I measure that spiral.
I wanted to calculate the error between the measured and targeted signals.
The normalised mean square error (NMSE) has been suggested to be used. But This one shows me high error even when i see virtually a good agreement through the graph.
The Equations that I have used is shown below in the attached graph. is there better method to calculate such kind of error?