Hi,
I am Using AWR1243 +TSW1400 for data capture in BPM mode.
To verify whether my BPM code (0 and 1) for 64 chirps is being properly applied or not, I captured the RX data for 1 frame (64 chirps) with Only one Tx ON.
The BPM code is different for all the 3 Tx transmitters. And I capture the data for all three Tx one after the other. (One Tx only ON at a time and capture the data 3 times for 3 Tx).
With this data I analyze the phase change after performing range FFT on it. I see an odd phenomenon as described below:
1. Most of the time, the BPM code for two Tx are proper, but for the 3rd Tx the BPM code is inverted.
2, The Tx whose BPM code is getting inverted changes every time on a Power cycle (OFF-ON). Without a power cycle, the faulty Tx remains faulty across multiple frames.
3. The Tx with inverted BPM code is not the same all the time.
4. Sometimes, rarely, we observe 2 Txs with inverted BPM code.
5. We have observed this with multiple AWR devices.
Can Anyone help us identifying the exact issue in this case?
We are strongly suspecting some kind of calibration related issue with the AWR chips. Can anyone guide us on finding the root cause of the issue.
Thanks in Advance,
Santhana Raj