I have plotted out the CIR data from DW1000 (ACC_MEM) and trying to understand how the First Path Amplitude -readings match with the CIR data.
The manual states that ‘…the magnitude of the accumulator tap at the index x beyond the integer portion of the rising edge FP_INDEX reported in this register’, but the amplitude in my CIR data does not match with the values in FP_AMPL1/2/3, see graph below. The CIR data is plotted from accumulator I/Q data: sqrt(II + QQ), blue line in the graph below.
’m reading the FP_AMPLx values from DW1000 with the driver (dwt_readdignostics()) and using the values as such.
I did plot out the data several times after separate distance measurement runs, but the data never matched with the FP_AMPL -readings (in the example above you could claim that the FP_AMPL1 and 3 have swapped, but that does not explain any other plot I have taken …)
Any ideas what I’m doing wrong here?