TIDUEN5A June   2019  – March 2020 AWR1243 , AWR2243

 

  1.   Revistion History

4.2.1 Chirp Configuration for MIMO Radar

For the MIMO application, the chirp configuration in Table 2 is used.

Table 2. Chirp Configuration - MIMO

PARAMETER SRR MRR
Idle time (µs) 5 4
ADC start time (µs) 6 5
Ramp end time (µs) 40 23
Number of ADC samples 256 256
Frequency slope (MHz/µs) 79 15
ADC sampling frequency (MSPS) 8 15
Number of chirps per frame per TX 128 128
Effective chirp time (µs) 34 17
Bandwidth (MHz) 2528 256
Frame length (ms) 69 4.4

With this chirp configuration the MIMO performance specified in Table 1 is achieved. The primary goal was to achieve a maximum distance of about 150 m and maximum velocity of +/- 130km/h. See Programming Chirp Parameters in TI Radar Devices for more details. As mentioned in the previous section, in MIMO mode, 6 antennae are used in azimuth and 3 in elevation. The 3 overlapped azimuth antennae cannot be used in MIMO. So, the total of chirps in a MIMO frame is 9 x "Number of chirps per frame per Tx." The Overlapped antennae are used for Vmax extension in TDM MIMO.