AWR1843BOOST: Frame rate for MRR

Hi,

This information can be computed based on the chirp configuration.

mmwave_automotive_toolbox\labs\lab0007_medium_range_radar\src\common\mrr_config_chirp_design_MRR120.h

The frame rate in MRR only mode is 30ms/frame

#define SUBFRAME_MRR_PERIODICITY_VAL           (6000000U) // 30ms

The MRR frame includes 2 types of chirps: "slow" and "fast"

There are 128 slow chirps and 128 fast chirps.

Chirp Cycle time = Idle Time + Ramp End Time

#define PROFILE_MRR_IDLE_TIME_VAL           (500U) //5us

#define PROFILE_MRR_RAMP_END_TIME_VAL       (6000U) //60us

(the meaning of these values can be found in

C:\ti\mmwave_dfp_01_02_00_01\docs\AWR1xxx_Radar_Interface_Control.pdf, section 5.5)

So the duration of a fast chirp is 65us.

Since there are 128 fast chirps, total duration is 8320us = 8.32ms

In a slow chirp the idle time is increased by:

#define CHIRP_MRR_1_IDLE_TIME_VAL             (1300U) //13us

So the duration of a slow chirp is 78us.

Since there are 128 slow chirps, total duration is 9984us = 9.984ms

So, total chirping duration is 18.3ms

This should help you compute the duty cycle

In MRR/USRR mode, both subframe type take 30ms. So, we have on MRR frame every 60ms

thank you

Cesar