I have a question about fake_gps

PX4 Autopilot
1

I’ve been looking for how to fly drones where I can’t use gps.
I have seen fake_gps, fake_imu, etc. in the PX4-Autopilot (1.14) file.
I was curious, so I ran it on gazebo garden.

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fake_gps start
pxh> WARN [health_and_arming_checks] Preflight Fail: height estimate not stable
WARN [health_and_arming_checks] Preflight Fail: height estimate error
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight: GPS Vertical Pos Drift too high
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight: GPS Horizontal Pos Drift too high
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight: GPS Horizontal Pos Drift too high
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight: GPS Horizontal Pos Drift too high
WARN [health_and_arming_checks] Preflight Fail: position estimate error
WARN [health_and_arming_checks] Preflight: GPS Horizontal Pos Drift too high
WARN [health_and_arming_checks] Preflight Fail: position estimate error

An error appears as above, is this normal?

Can I use it right away for an actual drone?

When do you use the rest of the fake functions?

I can’t find an explanation on the official website, so I’m asking you a question.
Is there any other data I can refer to?

2

Fake GPS is just sending a constant position with random noise. It’s just for bench testing the rest of the code, it’s not able to find you location from nothing.

3

Thank you for your answer. I’ll refer to it when I fly the drone.

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