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CC2640R2F: Why is n't the phase different fixed between first sample of two antennas?

Part Number:CC2640R2F

Hello

We are using CC2640R2F to collect the I/Q data.

the following table shows the phase difference between 1st antenna 1st sample and 2nd antenna 1st sample.

Since the location of both TI transmitter and receiver are fixed and the AoA should be same.

Why the value of  phase different (Pab-Paa/3) isn't a fixed value?

http://dev.ti.com/tirex/content/simplelink_cc2640r2_sdk_2_30_00_28/docs/blestack/ble_user_guide/html/localization/index.html#angle-of-arrival

versus_avg[a][b] += Pab_rel - ((Paa_rel * abs(a-b)) /numAnt);

1Phase A1.1 S0Phase A1.2 S0Pab PaaPab-Paa/3
2-12.28666184-4.1368308718.149830967  
3-32.98852161-28.442928624.545592989-20.7018597811.44621291
4-59.70685047-58.369338591.337511879-26.7183288510.2436215
5-83.02238151-88.77367214-5.751290631-23.315531042.02055305
6-108.1189827-113.0824663-4.963483618-25.096601143.402050097
7-136.7936449-136.9834767-0.189831759-28.674662289.368389001
8-176.6236317-164.669392811.95423888-39.8299867825.23090114
9175.0816193-178.7623208-353.8439401351.705251-471.0790237
10133.0666993149.481769316.41507002-42.0149199830.42004334
11120.364271120.1317186-0.232552359-12.70242834.00159041

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