In the "spark world", there is a lot off issues (flyaways) due to compass interferences: If the compass encounters troubles, it just turns off, leading the aircraft to ATTI mode, witch not everyone is prepared to deal with.

  

  

There are really great number of reports about that.

  

  

In the MA, DJI introduced what it´s called “Vision Compass”:

  

  

“Besides dual IMUs, FlightAutonomy 2.0 has more redundant modules to increase the Mavic Air’s safety level. The Vision Compass will assist the navigation system to estimate flight direction when the compass experiences interference. When only one direction of the front, bottom, or rear vision systems is functioning normally, the aircraft will still position itself successfully. There are two sets of sensor fusion algorithms based on two independent hardware platforms. When an error occurs to one set of algorithms, the aircraft will switch to the other pair seamlessly to resume normal functionality.”

  

  

  

But I didn’t find any further info about that (Vision Compass). How and when it works?

  

Does anyone knows more about that?

  

It's probably a method where they combine camera sensor data with compass data to bridge gaps in compass outages, i.e. they check whether the camera sensors imply a direction/location change in case the of a compass failure. This would prevent the drone from reacting too extremly to a lack of compass information. So basically visual information is used to compensate for compass information.

A lot of these new important pieces of technology seem to come out of dji with little background knowledge. But thank you for the information you have posted.

achim1989 Posted at 2018-2-13 11:12
It's probably a method where they combine camera sensor data with compass data to bridge gaps in compass outages, i.e. they check whether the camera sensors imply a direction/location change in case the of a compass failure. This would prevent the drone from reacting too extremly to a lack of compass information. So basically visual information is used to compensate for compass information.

That is probably right.

Well. Let´s see if it resolves the "flyaways" issues in Spark that allways scared me.

Adriano Araujo Posted at 2018-2-13 12:29
Well. Let´s see if it resolves the "flyaways" issues in Spark that allways scared me.

Well, compass problems happen to pro grade M200/M210 too.... so it's not just Spark.
MA and Spark are like toys to those pro machines... and they cost a lot.
And those pilots certainly know how and where to fly so not many "magnetic interference" explanations there.

Some reading:
https://forum.dji.com/forum.php? ... 543&fromuid=1362614
https://forum.dji.com/thread-132467-1-1.html
https://forum.dji.com/thread-131543-1-2.html
https://forum.dji.com/thread-121171-1-4.html

Would like toresume this thread. Does anyone knows more about the "Vision Compass"??

This is the official line from DJI:

Visual Inertial Odometry (VIO)

A combination of VIO technology and the new positioning algorithm has doubled the Mavic Air's precision positioning. VIO technology calculates the speed and attitude of the aircraft in real-time and locates it, making dual-camera attitude measurements while hovering or flying at any speed. The working range of the vision positioning system is now 0.5 to 30 meters. With VIO technology, the Mavic Air hovers more precisely indoors and responds better to complex environments with finer control stick movement.


3D Map Building

Equipped with an advanced sensing system, the Mavic Air locates itself with accuracy and precision. By processing data from the seven cameras at the front, bottom, and rear of the body, alongside the advanced infrared sensors and IMU, the Mavic Air will construct a 3D map by sensing the environment in real time, which significantly improves overall flight safety.
Advanced Pilot Assistance Systems (APAS)

APAS is the result of DJI’s extensive research on flight path calculation. Users can keep flying forwards and backwards, and APAS will plan an appropriate flight path to bypass obstacles automatically.

Multiple Redundancies

Besides dual IMUs, FlightAutonomy 2.0 has more redundant modules to increase the Mavic Air’s safety level. The Vision Compass will assist the navigation system to estimate flight direction when the compass experiences interference. When only one direction of the front, bottom, or rear vision systems is functioning normally, the aircraft will still position itself successfully. There are two sets of sensor fusion algorithms based on two independent hardware platforms. When an error occurs to one set of algorithms, the aircraft will switch to the other pair seamlessly to resume normal functionality.