Other Parts Discussed in Thread: MMWCAS-RF-EVM, MMWCAS-DSP-EVM
Hello,
I am using the TI AWR2243 cascade board with the MMWCAS-RF-EVM (Rev-E) connected to the MMWCAS-DSP-EVM.
mmWave studio software: version 03_00_00_14
Firmware: mmwave_dfp_02_02_02_01
I am using the MATLAB examples for the TDM MIMO modes. All 12 TX antennas are transmitting sequentially in a TDM fashion.
My objective is to analyze the estimated range values across different TX-RX pairs of an immobile single target placed at different range values.
The target is a corner reflector placed in the anechoic chamber at boresight from the AWR2243P radar kit at different range values, from 15cm to 110cm range. We adopt a chirp configuration that achieves a 3.89cm range resolution.
The captured raw ADC data is processed to generate the range profiles using 1D FFT processing.
The corner reflector range is estimated using peak detection on the range profile.
We compare the estimated range values of the corner reflector with respect to the ground truth range values across different TX-RX pairs.
The following figure shows the accuracy error of the estimated ranges of the corner reflector across different chirps and different radar frames from one TX-RX pair (TX1 - RX1 pair). As shown, the error is less than the range resolution, 3.89 cm.
The following figure shows the accuracy error of the estimated ranges of the corner reflector across different chirps, different radar frames, and different TX-RX pairs. As shown, the error is much larger than expected, less than 40 cm. The same radar frames were analyzed in these two figures.
My question is: What could be the reasons behind the random precision error in the second figure when comparing the range estimates across different TX-RX pairs?
Thank you for your help.
