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这个AOA只是个演示demo，数值只要有变化即可，确切的值受环境影响比较大，需要后续终端开发时进行完善。
The environment which you perform the measurement matters a lot, if you are in an open space with no metal around you, then you should see better result than this.
The result can be affected by multi-path reflection which creates a false angle of arrival.
The best way to use this demo is to
1. test it in the well controlled environment(antenna chamber) and analyzing the I/Q data.
2. Design your own filter (the current one in the BLE STACK is only moving average). You can add filtering base on standard deviation or even use the rssi value to decide to trust the data or not.
3. Once you are done with your own filter, then you can bring it to outdoor testing and check how good your filter is.
