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AWR1843: AWR1843_MRR demo_ velocity Resolution

Part Number: AWR1843

Tool/software:

Hi.....in the MRR demo we found that the Velocity resolution is found by the given equation :- #define SUBFRAME_USRR_VEL_RESOLUTION_M_P_S       (((1000.0f/(3.0f*SUBFRAME_USRR_CHIRP_REPETITION_PERIOD_US))/SUBFRAME_USRR_CHIRPTYPE_0_NUM_CHIRPS)*(PROFILE_USRR_LAMBDA_MILLIMETER/2.0f))

why are u multiplying SUBFRAME_USRR_CHIRP_REPETITION_PERIOD_US with 3. We found that the multiplying with 3 is only done for USRR configs but in MRR configs there is no such multiplication with 3 and it is as per the equation given the document - "Introduction to mmwave Sensing: FMCW Radars" .