RE: Direction Finding AoA with multiple receivers with one antenna

Simonr — Mon, 05 Jun 2023 11:00:33 GMT

We don't support this on our end I'm afraid, but I don't see a reason why this shouldn't work, as you're pretty free to do what you want with the number of antennas and CTE. However I don't see how accurate the direction finding here would be with only two reference points. In a high accuracy environment one would typically use 3 reference points with at least 4 antennas each to be able to triangulate the position of a device with single-cm accuracy.

You will likely be able to get a rough angle of arrival on the DKs, but only after you synchronize between these two devices to compare the received IQ data. We only support the part that is in the Bluetooth specification, and you will also need to convert these IQ samples from raw data to vector form to review them properly and compare them between the two devices. We don't have 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. Nordic will not provide a Direction Finding algorithm for you I'm afraid.

Best regards,

Simon