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hi,

we find that tag0 range with anchor1, anchor1 maybe miss the packet, lost probability about 1%, for example:

sequence number 1: range pass
sequence number 2: range pass
sequence number 3: range pass
sequence number 4: range pass
sequence number 5: range fail, anchor no ack answer
sequence number 6: range pass
sequence number 7: range pass
sequence number 8: range pass
sequence number 9: range fail, anchor no ack answer
sequence number 10: range fail, anchor no ack answer
sequence number 11: range fail, anchor no ack answer
sequence number 12: range pass
sequence number 13: range pass
sequence number 14: range pass
........
sequence number 253: range pass
sequence number 254: range pass
sequence number 255: range pass

maybe related with SYSCLKS, RXCLKS, TXCLKS ? or smart power mode? or other reason?

Is that happening with only one anchor, or all the anchor are similar?

hi,

all anchor maybe happen

Then it sounds like you have either radio interference or something in the TAG affecting this 1 percent of ranging. For example in the Crazyflie we have found that when the 2.4GHz radio is set to full power, it can prevents the dw1000 to receive packets. We also know that the DW1000 is very sensitive to power supply quality,

We also know that the DW1000 is very sensitive to power supply quality,

we also measure the power supply 3.3V ripple， find about 160mv jitter. maybe result in losing packet.