If nRF5340-DK really supports AoD(Angle of Departure) mode and can obtain CTE data in AoD mode? Can we achieve wireless transmission and reception of CTE data in AoD mode with only two sets of nRF5340-DK development kits and a 12 matrix antenna?

[xu shengxian]

I saw on the official website that the nRF5340-DK development kit supports low-power Bluetooth positioning in AoD (Angle of Departure) mode, and I found the corresponding Bluetooth wireless transceiver code in the file directory v2.4.2/nrf/samples/Bluetooth of the nRF Connect SDK. I have carefully read the code and found that it seems that AoA mode or AoD mode can indeed be achieved through simple configuration, and CTE (constant tone extension) signal data can also be obtained in AoD mode. But I still want to confirm if nRF5340-DK really supports AoD mode and can obtain CTE data in AoD mode? Can we achieve wireless transmission and reception of CTE data in AoD mode with only two sets of nRF5340-DK development kits and a 12 matrix antenna? The following is an example webpage provided by the official website about low-power Bluetooth wireless transmission and reception:

https://www.nordicsemi.com/Products/Wireless/Bluetooth-Direction-Finding

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direction_finding_central/README.html#

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direction_finding_peripheral/README.html

[Simonr]

Hi

Yes, this is possible if you follow the instruction on I.E. the Direction Finding central and peripheral samples that you linked to or the Direction Finding connectionless transmitter and receiver samples. Please note that we will not provide a Direction finding algorithm though, so you will need to handle the raw IQ data you receive to transform the into vector form to be reviewed properly. We don't have any specific sample code showing this, but you can check out this page for information on the various formulas used to translate IQ data between polar and rectangular form.

There are also third parties that provide a direction finding algorithm as part of their solutions as well, like Ublox in their nRF52833 Direction Finding modules (AOA only as far as I know).

Best regards,

Simon

[xu shengxian]

Thank you very much for your help!