Hi,
I am using nrf52833 for AOA, the examples are direction_finding_connectionless_tx and direction_finding_connectionless_rx. Now I use two antenna array for locater and I can get cte data. For further caculating I print I and Q data in cte_recv_cb function. My question is no matter how I adjust the arrival angle, the caculated results are barely change(all results are about 90 degree), while the I and Q data change a lot.
The distance between two antennas is 12cm. I caculate phase angle of each sample data use arctan(Q/I) (use atan2 in python can get radian value). Then from the 9th sample value, caculate the difference in pairs. Use cofficient 12.5/(2*pi) to get the cosine of angle of arrival.
In this way of calculating, the difference always less than 10 degree, and caculated results close to 90 degree no matter how I change angle of arrival. Could you please help me to see if there is any problem with the calculation method. Here are some I Q data
I : [-31, 30, -30, 31, -33, 37, -33, 32, -38, -41, -39, -45, -40, -46, -40, -45, -37, -42, -35, -37, -29, -35, -22, -29, -18, -20, -11, -17, -3, -6, 6, 1, 11, 9, 20, 14, 26, 24, 30, 33, 37, 38, 38, 41, 38]
Q: [33, -33, 34, -32, 31, -28, 31, -29, 13, 18, 8, 12, -5, 2, -8, -8, -17, -13, -20, -24, -27, -28, -34, -35, -36, -41, -41, -42, -40, -44, -39, -46, -39, -46, -36, -43, -30, -37, -29, -31, -19, -28, -12, -15, -5]
I: [-34, 36, -37, 35, -37, 34, -35, 37, -63, -40, -66, -43, -65, -45, -68, -45, -61, -42, -61, -39, -48, -34, -42, -26, -32, -19, -21, -10, -12, -9, 5, -2, 17, 9, 31, 19, 36, 27, 46, 31,
53, 37, 59, 41, 63]
Q: [26, -27, 29, -27, 27, -29, 27, -27, 19, 18, 11, 12, -5, 4, -12, -5, -25, -15, -27, -25, -44, -30, -51, -35, -58, -42, -63, -43, -66, -44, -67, -44, -64, -44, -60, -41, -54, -37, -46,
-32, -39, -23, -30, -21, -19]
