AWR2243: AWR2243 calibration questions

Hello,

I understand your concern. Let me clarify these things for you :

f_chirp and f_calib both correspond to chirp frequency slope parameter but they are used in different scenarios. 

f_chirp corresponds to the actual chirp frequency slope used while transmitting chirps in your chirp/profile config API.

You know to eliminate the phase/amplitude or frequency mismatches, we have to calibrate the radar device. This is a one time procedure required by each device separately. Now for calibration, you place a corner reflector and capture a few frames of data whose results are stored in the form of a calibration file. This is then used as a reference for all your future measurements. Here, the configuration of chirps used by you to create your calibration file forms a part of the calibration chirp configuration and f_calib (and fs_calib) corresponds to the chirp slope used for that purpose.

It is not necessary that these two parameters (i.e f_chirp and f_calib) have to be always different. 

Let me give you an example. Say in your operation, you use chirps of bandwidth 1GHz (starting from 77GHz). This means you are only using 77-78GHz band. To calibrate the devices, there are 2 options now:

Either you can decide go ahead with the default settings and that will calibrate the device according in the entire 5GHz band i.e 77-81GHz. Now this is where f_chirp and f_calib will be different. 

The other option is, you can specifically calibrate the device to only work in 77-78GHz operation. Here, both f_chirp and f_calib will be same.

Basically the calib parameters are only used for calibrating the device, whereas chirp parameters are what you actually used in your chirp/profile config. They may or may not be equal, it all depends on you.

Hope the clarification made sense. Let me know if you have any further questions.

Regards,

Ishita