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IWR6843AOP: elevation, DCA1000

Part Number: IWR6843AOP

hello, I've tried to estimate the elevation and azimuth using iwr6843aop with DCA1000.

Azimuth looks fine but there seems to be some kind of angle shift in elevation.

I moved a reflector upside down in front of the radar and the center of the elevation estimation should be 0 degree but it looks like it's shifted about 90 degrees.

Do you have any idea what happened?

I used TDM. The order of tx transmission was tx1-> tx3-> tx2.  Even when i used the order of tx1-> tx2-> tx3, same thing happened.

The figure shows the azimuth and elevation I estimated. The unit of the angle is radian and the x axis is the number of frame.