Question on pulse train for different range and request for implementing control over the pulse pattern and duration

Hello ADI team, 

I found that the laser pulses for the medium range is different from the short range and long range. It has a three subfrarmes in a frame while the other two only have two. Why is it so? 

It will be highly appreciated if we are able to adjust the pulse pattern and duration with the SDK for prototyping.. 

Regards, 

Mike