Let me ask a question.
What is PSC?
I found this word in the full parameter list.
What does PSC stand for?
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Hi, I think it stands for Position Controller 
Those parameters set how the vehicle responds to navigation commands (for example to make it more aggressive).
Thank you! @guglie
I used mavros to input velocity commands.
However, the velocity and PSC.TVX were different.
I seem to need more understanding.
Thanks.
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Ok, so you’re talking about PSC message in the logs. You can try to share the log you’re looking at to see if somebody can help.
What was different? Commanded velocity / PSC.TVX?
Here’s a PSC log message legend:
TPX = Desired position in X
TPY = Desired position in X
PX = Current position X relative to the home location in cm
PY = Current position Y relative to the home location in cm
TVX = Desired velocity in X
TVY = Desired velocity in Y
VX = Current velocity X in cm/s
VY = Current velocity Y in cm/s
TAX = Desired acceleration in X
TAY = Desired acceleration in Y
AX = Current acceleration X in cm/s/s
AY = Current acceleration Y in cm/s/s
There’s an open thread on position controller tuning here where you can find some information.
exactly! @guglie
I don’t understand the difference between command velocity and target velocity.
The command velocity seems to be the target velocity after some filtering.
: GUID.vX and PSC.TVX
The velocity at which my test code publishes to mavros is GUID.vX / GUID.vY.
Moreover, it is 100 times different from the published velocity.
I share my log.
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