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Relative power is among the readings themselves i.e relative to each other. It helps in visually noticing targets and in range profile plot (corresponding to 0 doppler) for example we also indicate the targets in the plot that were detected by CFAR. A detection algorithm like CFAR compares cell under test with neighboring cells so it is relative. Visualizer adjustment based on FFT size was to make the display levels not vary based on FFT sizes so one can do a relative comparison among chirp profiles that may have different FFT sizes i.e the display scale does not keep changing among profiles just due to different FFT sizes.
So the relative power was not meant to connect to some dBm level at the input to the SoC, although it can be with two pieces of information 1) What is athttps://e2e.ti.com/support/sensors/f/1023/t/613223, which shows the relationship between input power and ADC samples and 2) The scalings etc that happen from ADC to the power calculation which information is in the spread-sheet that was pointed out earlier. However, this is unnecessarily complicated compared to just doing 1) by estimating the average power of the ADC samples [1/N sum(|.|^2)], which for example you can do by streaming out the ADC samples using mmwave studio (or also in demos that have LVDS streaming feature implemented) and doing an off-line computation.
里面有具体的计算方法：Below is an example calculation to get the amplitude level at the LNA input -> If you are using 12bit ADC mode , a value of 0x7FF corresponds to positive peak value at the ADC input, which corresponds to 1V peak voltage at the ADC input. 1V peak corresponds to 10dBm power (50 ohms system , assuming sinusoidal signal). Now if the RX gain setting is 30dB , this means at the LNA input the power level is (10dbm -30dbm ) = -20dBm.
