fail err(-11) when in DF,I i can get the iq samples,but i use them to caculate the angle of Tx,how to solve it?

[swz_nordic]

I use both nrf52833 boards to do AOA  test.But i use thr antenna array board of silab.The board are 16 antennas.I use the NCS version 1.9.1.

The next is my device stcture.

I conple the precedure and the flash the precedure to my board.i can get the  IQ samples.But i think it may be damege to my algorithm of angle.

But i can;t solve the this problem.can you help me?

[swz_nordic]

ok,thanks.i know whether other antenna array with thiis nordic board make some influence in IQ values.

as i said some days ago,i find that the IQ sample  are so small.

I get the IQ sample from silab as next.

{
	"channel":	18,
	"rssi":	-55,
	"sequence":	173,
	"samples":	[1, -57, -56, -2, -3, 57, 56, 2, 3, -56, -56, -3, -3, 57, 55, 6, 36, 45, -32, -87, -21, -13, -13, -41, 58, -68, -84, 29, 81, -29, -22, 2, -84, -88, 54, 95, -9, -68, -6, 20, -111, 34, 85, -24, -20, -37, 54, 2, 21, 52, -16, -92, -18, -15, -7, -42, 68, -57, -87, 15, 84, -15, -22, -1, -64, -108, 40, 104, 1, -69, -10, 19, -114, 21, 88, -9, -13, -40, 53, 10, 12, 56, 0, -94, -16, -17, 1, -43, 78, -44, -88, -1, 86, 1, -22, -4, -45, -115, 21, 111, 14, -67, -13, 17, -118, 0, 88, 2, -5, -42, 51, 19, 0, 58, 14, -93, -12, -20, 7, -42, 83, -31, -86, -13, 85, 13, -20, -9, -25, -125, 0, 116, 26, -64, -15, 15, -119, -18, 86, 22, 0, -42, 46, 27, -8, 57, 31, -87, -8, -23, 13, -40, 88, -14, -84, -29, 82, 28, -19, -12, -1, -126, -18, 109]

The nrf52833 board with antenna array of silab as next  as IQ values.

CTE[DE:86:9B:6D:43:F0 (random)]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -580

IQ sample content :

sample[0] = I:-2 Q:13

sample[1] = I:0 Q:-14

sample[2] = I:-2 Q:13

sample[3] = I:1 Q:-14

sample[4] = I:-3 Q:12

sample[5] = I:2 Q:-14

sample[6] = I:-3 Q:13

sample[7] = I:2 Q:-14

sample[8] = I:10 Q:-8

sample[9] = I:-12 Q:-2

sample[10] = I:-9 Q:-10

sample[11] = I:0 Q:-3

sample[12] = I:3 Q:-10

sample[13] = I:-4 Q:5

sample[14] = I:4 Q:7

sample[15] = I:-5 Q:3

sample[16] = I:-6 Q:3

sample[17] = I:-28 Q:5

sample[18] = I:2 Q:-4

sample[19] = I:11 Q:3

sample[20] = I:-2 Q:-13

sample[21] = I:4 Q:-13

sample[22] = I:1 Q:-1

sample[23] = I:10 Q:-2

sample[24] = I:-7 Q:-2

sample[25] = I:-4 Q:7

sample[26] = I:-6 Q:-3

sample[27] = I:-6 Q:-4

sample[28] = I:-18 Q:-24

sample[29] = I:4 Q:-1

sample[30] = I:1 Q:11

sample[31] = I:8 Q:-9

sample[32] = I:12 Q:-4

sample[33] = I:1 Q:1

sample[34] = I:6 Q:7

sample[35] = I:-2 Q:-7

sample[36] = I:-9 Q:0

sample[37] = I:0 Q:-7

sample[38] = I:-1 Q:-7

sample[39] = I:11 Q:-27

sample[40] = I:2 Q:2

sample[41] = I:-10 Q:7

sample[42] = I:12 Q:1

sample[43] = I:9 Q:9

sample[44] = I:-1 Q:1

as the err(-11) problem,when i meet ,i will call back to you.

Thanks.

[swz_nordic]

I can contrl the 16 antenna array,but i now meet the problem of algorithm.can you tell me the more information of algorithm of DF?

[Sigurd Hellesvik]

I do not think I have more information about the algorithm than I have already provided in this case.

Is there any specific information you are looking for?

Regards,
Sigurd Hellesvik

[swz_nordic]

Thanks.i use the blutooth toolbox of MATLAB to get the angle of DF.I find the angle are very further from the real.i use the silab's board to make experimet,i can get the real angle.i doublt the IQ samples values have some problem.how do you think of it?

[Sigurd Hellesvik]

It is possible that your issue is caused by the algorithm you use.

Unfortunately, I am not able to help you design the algorithm you need.
As I quoted earlier: "Nordic will not provide the direction finding algorithm, and customers/users are expected to get that elsewhere."

Regards,
Sigurd Hellesvik