how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

RE: how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

Simonr — Wed, 20 Apr 2022 12:07:41 GMT

I'm sorry, but I don't know what angles you're expecting or how your antenna array is placed compared to the transmitting device. So this doesn't tell me much I'm afraid.

Best regards,

Simon

RE: how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

swz_nordic — Tue, 19 Apr 2022 10:28:44 GMT

ok,i use the phase diffence to calculate the angle.the formula is below.

but when i use Matlab from my iq sample to get the phase diffrence.then i use it to get the angle of DF.

I find the angles are not corect.the below are my calculating result.

RE: how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

Simonr — Tue, 19 Apr 2022 08:50:20 GMT

Yes, the direction finding is based on the phase difference between the antennas. But what exactly is the issue/question here?

Best regards,

Simon

RE: how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

swz_nordic — Mon, 11 Apr 2022 05:53:05 GMT

Thank for your reply.i know your mening.i said that the sample 8 is from the secend antenna,the sample 9 is from the third antenna and so on.

The AOA algorithmn have to use phase diffrence to get the direction.For example,so you have to the nubers 2 or 3 receive the sample iq numbers.do you think so?

RE: how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

Simonr — Mon, 11 Apr 2022 05:36:19 GMT

Hi, can you explain what you mean by "distinguish which IQ samples are from the antenna array"? The antenna array receives IQ samples from the beacon. The received IQ samples you get you'll need to convert into vector form to review properly, using an AOA algorithim, which we don't provide. You can check out this page for information on the various formulas used to translate IQ data between polar and rectangular form.

Best regards,

SImon

RE: how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

swz_nordic — Fri, 08 Apr 2022 12:51:48 GMT

ok,i now can get the iq samples 82.i have't save the configuration.

there is a thing i can't understand.how to distinguish the which iq sample is from the antenna arrya nubers.the 37 isample is devided imto anntenna array.how can get the iq by using algorithm to caculate the angle?

RE: how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

Simonr — Fri, 08 Apr 2022 12:42:24 GMT

You need to make sure that the slot_durations are set to 0x1, and that the CONFIG_BT_DF_CTE_RX_AOA is set so the slot duration in enable_cte_rx() is actually completed.

Best regards,

Simon