Connect 2 nRF 5340 DK together

RE: Connect 2 nRF 5340 DK together

tesc — Wed, 15 Nov 2023 15:26:20 GMT

Hi,

See my previous answer:

[quote user="tesc"]

I am afraid the short and simple answer to your questions is no.

For AoA and AoD, you need an antenna array with multiple antennas, where the antennas are in a known, fixed position relative to each other, with equal connection (cable lengths, etc.) from the radio pin on the nRF53, and where only one antenna is connected at any one time (controlled through switches controlled by the nRF53.). For this you do need a special purpose antenna array.

Further, please note that the algorithms for calculating angles from QI data also depend on the antenna array, so if you do develop a custom antenna array then you must also develop the algorithms needed for that particular antenna array.

[/quote]

For a better understanding of how direction finding works, and what are the requirements and limitations, I recommend watching our Introduction to Bluetooth Direction Finding webinar.

Short story is you need an antenna array, such as for instance the XPLR-AOA-1 from u-blox. Combining IQ samples from multiple boards will not work, since each board with one antenna will give a continuous wave (with no phase shifts) and angle analysis requires a switch between multiple antennas (each switch giving a phase shift in the QI data, which is what is used for calculating the difference in distance from the tracker to each antenna, which then is used for calculating the position of the tracker relative to the antenna array through what is basically multilateration.)

Regards,
Terje

RE: Connect 2 nRF 5340 DK together

Michael-Mo — Wed, 15 Nov 2023 02:34:27 GMT

So I want to output the IQ samples get by my antennas. I'm doing angle of arrival but I don't have an antenna array so I use 2 board to act as a antenna array. I want to output the IQ samples get by the 2 board to calculate the AoA.

RE: Connect 2 nRF 5340 DK together

tesc — Tue, 14 Nov 2023 12:37:46 GMT

Hi,

Yes. In general, any information that you get on the nRF53, you should be able to send to another device, in a number of ways.

Now, the question then is, what information, and process it in what way, and for what purpose?

Regards,
Terje

RE: Connect 2 nRF 5340 DK together

Michael-Mo — Thu, 09 Nov 2023 13:23:36 GMT

So may be we can put the AoA aside. Is it possible that I can process the information get by the nordic board by another device? For example, with my laptop, arduino or rasberry pi?

RE: Connect 2 nRF 5340 DK together

tesc — Thu, 09 Nov 2023 11:03:46 GMT

Hi,

I am afraid the short and simple answer to your questions is no.

Regards,
Terje