I’m taking two readings of CIR, one after another, from the same pair of Tx-Rx. The environment is kept static during CIR collections. But if I compare the phase of their first peaks, they’re not even close. The first peak phase seems to be changing. I don’t think this should happen give the environment is static. Is there anything I’m missing? (In the plot, the vertical line marks the first path index output by DW1000, which overlapps in two CIRs).