To calibrate the antenna delay, range is measured at a known distance using 2 DW1000 systems. Antenna
delay is adjusted until the known distance and reported range agree. The antenna delay can be stored in
OTP memory.
There is a Transmitter Antenna Delay and a Receiver Antenna Delay. The Transmitter Antenna Delay is used
to account for the delay between the internal digital timestamp of the RMARKER (at the start of the PHR, see
3.2) inside the DW1000 and the time the RMARKER is transmitted from the antenna. The Receiver Antenna
Delay is used to account for the delay between the time of arrival of the RMARKER at the antenna and the
internal digital timestamp of the RMARKER (at the start of the PHR, see 4.1.6 – RX Message timestamp)
inside the DW1000.
Figure 30: Transmit and Receive Antenna Delay
8.3.1 Calibration Method
To achieve the highest accuracy during calibration, it is recommended that antenna delay is calibrated with
the receiver power input at the following levels:
Table 55: Recommended RX power level for antenna calibration
Power at receiver
input (dBm/MHz)
If the transmitter is set to -41.3dBm/MHz and 0 dBi antennas are used, then the receiver input powers above
equate to the following separations between transmit and receive antenna:
Table 56: Recommended TX-RX separation for antenna calibration
Calibration Separation (m)
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