Phaser: Velocity calculation in the output of Range_Doppler_Plot.py is distorted

Can you confirm the rev of Pluto and of the response to print(adi.__version__)

Also, try inserting this line right after line 103

sample_rate = my_sdr.sample_rate

Pluto Rev.C v0.38
adi library version: 0.0.19

Ok, yes that's the problem.  You need Pluto rev 0.39.  See lines 49-51 for more details:

That should clear up the "slant" in the ground clutter return.  Also try the sample rate code above to deal with the offset.  

I work with TDD and rev 0.39, but the results are still not synced, I wrote you a direct message because the example is too big for the forum.

After upgrading the Pluto to v0.39, I am facing this issue.

analog@phaser:~/PhaserRadarLabs $ python3 Range_Doppler_Plot.py
0.0.19
Traceback (most recent call last):
File "/home/analog/PhaserRadarLabs/Range_Doppler_Plot.py", line 107, in <module>
my_sdr.gain_control_mode_chan1 = 'manual' # manual or slow_attack
File "/usr/local/lib/python3.9/dist-packages/adi/ad936x.py", line 223, in gain_control_mode_chan1
self._set_iio_attr("voltage1", "gain_control_mode", False, value)
File "/usr/local/lib/python3.9/dist-packages/adi/attribute.py", line 71, in _set_iio_attr
raise ex
File "/usr/local/lib/python3.9/dist-packages/adi/attribute.py", line 69, in _set_iio_attr
channel.attrs[attr_name].value = str(value)
AttributeError: 'NoneType' object has no attribute 'attrs'

This issue was solved by setting the environmental variable for ad9361 as showcased in : video

Thanks Ketan!  Yes, you can also find the instructions for updating Pluto's firmware and setting to two Rx/Tx mode (i.e. AD9361 mode) here:  

https://wiki.analog.com/resources/eval/user-guides/circuits-from-the-lab/cn0566/quickstart#appendixpluto_setup