Other Parts Discussed in Thread: IWR6843, TDA2
I have been testing the MMWAVCAS-RF which I found to be producing very strange results. Therefore, I compared it in a similar scenario to the IWR6843 to evaluate and compare results. IWR6843 has always provided measurement results as expected by theory.. This is not the case with the cascaded system.
Attached you can find a small presentation I setup for more detailed explanation of the measurements. Hereby I provide a brief overview. I would like to share my observations with you and ask for your support of how to fix or exchange the part since I believe that it is faulty.
Measurement description:
The radar sensor, either IWR6843 or MMW-RF-CAS is placed on a sliding platform which moves horizontally and tangentially to the target, with tangential length of 60cm. A measurement is performed with one standard trihedral corner reflector with rib length of 5cm at various distances. First at 0.2m and then at 0.6m, measured when target is straight against the sensor. The sensor is aligned in the vertical dimension as the target center is aligned to the midpoint of the Tx and Rx antenna. The raw data is Fourier transformed and the resulting range profiles are stacked next to each other in order to form a two dimensional image, where range profiles are plotted as a function of time. The chirp parameters for both devices are set to be the same, with the only difference that the cascaded system transmits in the MIMO mode(as provided by the lua script) ,while the IWR transmits with only one transmitter. RAM is placed on the wall behind the target.
The theoretical expectation is to observe a smooth curved line due to the range migration of the target and the tangential motion. This is the case for the IWR6843 but not with the cascaded system.