DREA to YXZ，the detail about the doppler processing

[gxmc0ming]

Hi, I have read the Matlab code about the radar data processing. Here are my questions? 1、when transfer the DREA to XYZ, the code just mean the frist 10 doppler array? I think because the objects is dynamic, why not mean all the doppler dimension? 2、the speed is ranging from the -1.9 to 1.9m/s, and I think the radar form may be designed to detect much larger speed by using different chirps？

Hope to know more detail about the cfg of the radar.