Obstacle avoidance altitude

t2adze · Jul 19, 2016

As i know, P4 has obstacle avoidance system which after it comes close to an obstacle stops, and in case of RTH it ascends and after avoidance is gone continues going forward/rth.

Question is, what is the altitude limit in that case?

A) whatever user has allowed in the app
B) 120 meters
C) 500 meters
D) It doesn't ascend

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CThruU · Jul 19, 2016

t2adze said:
As i know, P4 has obstacle avoidance system which after it comes close to an obstacle stops, and in case of RTH it ascends and after avoidance is gone continues going forward/rth.

Question is, what is the altitude limit in that case?

A) whatever user has allowed in the app
B) 120 meters
C) 500 meters
D) It doesn't ascend

Sent from my SM-G900FD using PhantomPilots mobile app

You set the RTH altitude in the app. The entry is in meters regardless of measurement system selected. It won't go higher than this entry if it encounters an obstacle.

CThruU · Jul 19, 2016

Hao Nguyen · Jul 20, 2016

CThruU said:
You set the RTH altitude in the app. The entry is in meters regardless of measurement system selected. It won't go higher than this entry if it encounters an obstacle.

I think it will climb.

Dropbox - IMG_2442.PNG

makg · Jul 20, 2016

This is from the manual, hope it's what you're looking for.

Aircraft can now sense and actively attempt to avoid obstale during FailSafe RTH, provided that the light condition is ideal for the Obstacle Sensing System. The details on how the aircraft will behave during obstacle avoid is listed below:
1. Aircraft decelerates when an obstacle is sensed at 65 feet (20 meters) ahead.

2. Aircraft stops and hover then start ascending vertically to avoid the obstacle. Eventually, the aircraft will stop climbing when it is at least 16 feet (5 meters) above the detected obstacle.

3. Failsafe RTH procedure resume, the aircraft will continue ying to the Home Point at the current altitude.

Only knew it was in there because I've been studying the manual at work in anticipation of my P4.

CThruU · Jul 20, 2016

makg said:
This is from the manual, hope it's what you're looking for.

Aircraft can now sense and actively attempt to avoid obstale during FailSafe RTH, provided that the light condition is ideal for the Obstacle Sensing System. The details on how the aircraft will behave during obstacle avoid is listed below:
1. Aircraft decelerates when an obstacle is sensed at 65 feet (20 meters) ahead.

2. Aircraft stops and hover then start ascending vertically to avoid the obstacle. Eventually, the aircraft will stop climbing when it is at least 16 feet (5 meters) above the detected obstacle.

3. Failsafe RTH procedure resume, the aircraft will continue ying to the Home Point at the current altitude.

Only knew it was in there because I've been studying the manual at work in anticipation of my P4.

Thanks. I should've re-read the manual before responding. So I'm guessing that it will ascend until max set height reached? If you set a really low max height or are flying towards a really tall obstacle, will it climb to max height and then hover?

Lyverbe · Jul 20, 2016

What if there's an obstacle above the drone? As far as I know, there are no sensors above the drone so it would hit while ascending while trying to RTH?

t2adze · Jul 20, 2016

makg said:
This is from the manual, hope it's what you're looking for.

Aircraft can now sense and actively attempt to avoid obstale during FailSafe RTH, provided that the light condition is ideal for the Obstacle Sensing System. The details on how the aircraft will behave during obstacle avoid is listed below:
1. Aircraft decelerates when an obstacle is sensed at 65 feet (20 meters) ahead.

2. Aircraft stops and hover then start ascending vertically to avoid the obstacle. Eventually, the aircraft will stop climbing when it is at least 16 feet (5 meters) above the detected obstacle.

3. Failsafe RTH procedure resume, the aircraft will continue ying to the Home Point at the current altitude.

Only knew it was in there because I've been studying the manual at work in anticipation of my P4.

So can that 5 minute ascending be changed to any other number?

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blade strike · Jul 20, 2016

t2adze said:
So can that 5 minute ascending be changed to any other number?

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it will ascend to avoid the object

t2adze · Jul 20, 2016

blade strike said:
it will ascend to avoid the object

Sorry i meant meters.

Can 5 meters be adjusted?

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blade strike · Jul 20, 2016

t2adze said:
Sorry i meant meters.

Can 5 meters be adjusted?

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Sorry I don't understand the question?

t2adze · Jul 20, 2016

They said it ascends 5 meters and then moves on. Can this value of 5 meters be changed?

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blade strike · Jul 20, 2016

t2adze said:
They said it ascends 5 meters and then moves on. Can this value of 5 meters be changed?

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Oh sorry, no it can not.. It should stop and if it still doesn't have a clear view I do believe it will try another 5m.

John Locke · Jul 20, 2016

t2adze said:
They said it ascends 5 meters and then moves on. Can this value of 5 meters be changed?

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I wondering why you'd want to change that setting. Can you explain? Seems to me if it has clearance to return, all is good in most cases. After resuming forward flight during RTH, and it sees anything else in the way, it stops to ascend again, (IE: a gradual incline hill) enough to be 5M above the obstacle (this could be a 250' building) , and continues the RTH. This seems like it would work for all scenarios. Maybe an increase to 15M might help avoid antennas or wire stringers to brace antennas in suburban areas, things that OA can't see. Is that your thought?

volace · Jul 20, 2016

P4 will climb in RTH mode to avoid obstacles , irrespectively of your RTH altitude you specify in the application , then it will cruise on this new higher altitude , unless it finds another obstacle in the new higher altitude , it would ascend further to avoid it , the only part which is unknown is what if the obstacle is higher than the maximum operating altitude of p4 which is 500 meter ?

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volace · Jul 20, 2016

By the way if you fly night time you need to set your Rth altitude higher than any obstacle since obstacle avoidance would not work

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azgeek · Jan 15, 2017

blade strike said:
it will ascend to avoid the object

Thanks for posting. The manual wasn't entirely clear to me on what "avoid the obstacle" meant. My worry was that the P4P would detect the obstacle and then just hover until the battery ran low enough to force a landing, wherever that might be. Good to know it will attempt to fly over an obstacle rather than just hover.