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Direction finding AOA with nRF52833

user116169

Hi,

I have program two nRF52833, one as transmitter and one as receiver (with zephyr project called "direction_finding_connectionless_tx" and "direction_finding_connectionless_tx"). I have an antenna array with 4 antenna patch.

But i have a problem, i have not the angle of arrival and i have not always the same result:

Sometimes i have the CTE that appears and sometimes not.

I have the impression that the main stop at the line 359:

My receiver see my transmitter as you can see but what i have to do to see the angle of arrival ?

Please i'm lost and if someone can help me i'm more than interested.

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  • 0

    Hi

    1. You can set the number of samples you want to receive to fit your application, where have you gotten the number 45 from?. The total number of IQ samples provided by the IQ samples report varies. It depends on the CTE length and the antenna switch slot length. There will always be 8 samples from the reference period, 1 to 37 samples with 2 µs antenna switching slots, 2 to 74 samples with 1 µs antenna switching slots, meaning 9 to 82 samples in total.

    2. The antenna switching is done by 2 GPIOs that switch in the pattern that ant_patterns is set in in main.c. The GPIO switches the antennas based on the slot length you have set. More information here.

    3. You can contact the regional sales manager of your area for more information on fitting antenna arrays provided by us or third parties, as they would have a overview of what is available in your area. If you don't know who to contact, fill out the sales related questions form here to get in touch.

    Best regards,

    Simon

Reply
  • 0

    Hi

    1. You can set the number of samples you want to receive to fit your application, where have you gotten the number 45 from?. The total number of IQ samples provided by the IQ samples report varies. It depends on the CTE length and the antenna switch slot length. There will always be 8 samples from the reference period, 1 to 37 samples with 2 µs antenna switching slots, 2 to 74 samples with 1 µs antenna switching slots, meaning 9 to 82 samples in total.

    2. The antenna switching is done by 2 GPIOs that switch in the pattern that ant_patterns is set in in main.c. The GPIO switches the antennas based on the slot length you have set. More information here.

    3. You can contact the regional sales manager of your area for more information on fitting antenna arrays provided by us or third parties, as they would have a overview of what is available in your area. If you don't know who to contact, fill out the sales related questions form here to get in touch.

    Best regards,

    Simon

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