AWR1843AOP: regarding angle estimation accuracy

In the associated previous thread the following details were given

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The AWR1843AOP has an angular accuracy which is not as good as the AWR1843BOOST EVM with PCB antennae.

For angles < +/- 45 deg, we measured 5deg angle accuracy. For larger angles, 10+ degrees.

Angular accuracy can be improved using multi angle calibration.

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whether accuracy of +/- 1 degree can be achieved.

If so how to do,

Please clarify,

Thank you