When using the aircraft, in addition to directly seeing the image from the aircraft's camera view, the aircraft has "sensing abilities" that we cannot see with the naked eye.

It is recommended to enable the obstacle avoidance function in the app during the flight.

 

Obstacle Avoidance Directions and Systems Supported by Drone

Applicable products	Downward Vision System	Forward Vision System	Backward Vision System	Left Vision System	Right Vision System	Upward Vision System	Whether manual enabling/disabling is supported
DJI Neo	Binocular vision system + Infrared sensing system	×	×	×	×	×	No
DJI Mini 4K	Infrared sensing system	×	×	×	×	×	Yes
DJI Avata 2	Binocular vision system + Infrared sensing system	×	Binocular vision system	×	×	×	No
DJI Mini 4 Pro	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Yes
DJI Air 3	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Yes
DJI Mavic 3 Pro	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Yes
DJI Inspire 3	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Yes
DJI Mini 3	Single vision system	×	×	×	×	×	No
DJI Mini 3 Pro	Binocular vision system	Binocular vision system	Binocular vision system	×	×	×	Yes
DJI Mavic 3	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Yes
DJI Air 2S	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	×	×	Binocular vision system	Yes
Mavic Air 2	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	×	×	×	Yes
DJI Mini 2/2 SE	Infrared sensing system	×	×	×	×	×	Yes
Mavic 2	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	Single vision system	Single vision system	Infrared sensing system	Yes
Mavic Mini /SE	Infrared sensing system	×	×	×	×	×	Yes
Mavic Air	Binocular vision system + Infrared sensing system	Binocular vision system	Binocular vision system	×	×	×	Yes
Mavic Pro	Ultrasonic sensor	Binocular vision system	×	×	×	×	Yes
Spark	Single vision system	Infrared sensing system	×	×	×	×	Yes
Phantom 4 Pro/Phantom 4 Pro V2.0	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	Binocular vision system	×	Yes
Phantom 4 Advanced	Binocular vision system	Binocular vision system	×	×	×	×	Yes
Phantom 4	Binocular vision system	Binocular vision system	×	×	×	×	Yes
Inspire 2	Binocular vision system	Binocular vision system	×	×	×	Infrared sensing system	Yes
Inspire 1	Binocular vision system	×	×	×	×	×	Yes
DJI FPV	Binocular vision system	Binocular vision system	×	×	×	×	Yes
DJI Avata	Binocular vision system + Infrared sensing system	×	×	×	×	×	No

 

Introduction to Common Sensing Systems

 

Vision Sensing System

Binocular vision is similar to a type of vision in which a person has two eyes capable of facing the same direction to perceive a single three-dimensional image of its surroundings and to calculate the distance between objects. Vision sensing system applies to well-lit environments. However, its algorithm is complex and has a long latency, which is unsuitable for dim environments or environments with significant changes in lighting. The sensing ability largely depends on the reflective properties of the object it is focusing on. Hence, the sensing ability decreases in poorly-lit environments or flying over smooth surfaces (e.g., mirrors or tiles). It is recommended to pay close attention to the surrounding environment during flight, especially at night.

* The Mavic 2 only has two cameras on either side of the aircraft, thus having a weaker sensing capacity than the binocular vision system.

 

Infrared Sensing System

Infrared is used in a variety of applications. The most well-known are remote controllers for air conditioners and TVs and hotel automatic doors. The infrared sensor generally adopts the principle of triangular ranging measurement, that is, the time when the infrared rays are reflected from the reflector after they are emitted from the rangefinder, and the distance to the target can be accurately calculated by considering the propagation speed of the infrared rays. It is straightforward to use and safe, but the infrared sensing system has the disadvantages of low measurement accuracy, short detectable range, and poor directionality.

 

Ultrasonic Sensing System

Ultrasound can be transmitted by air, liquid, or solid vibration, which is usually applied to aircraft by installing a directional ultrasonic transmitter and receiver, then connecting to the flight control system. The advantage of the ultrasonic sensing system is that it will not be disturbed by light, dust, and smoke. However, if flying over diffuse reflective surfaces or objects of reflectance deficiency, such as blankets, the effective detectable range of the sensing system will be reduced because the reflected ultrasonic signal is insufficient for detection, and the distance cannot be measured correctly.

 

Enabling/disabling the obstacle avoidance system in the DJI app

 

DJI Fly

1. Tap “···” in the top right corner of the camera view.

2. Tap “Safety” and then select your desired function for “Obstacle Avoidance Action.”

 

DJI GO 4

1. Tap “···” in the top right corner of the camera view.

2. Select “Visual Navigation Settings” and then tap to turn on/off “Enable Obstacle Avoidance” in the top right corner.

 

When your aircraft prompts "Vision system error", please refer to Aircraft Vision Sensor Calibration Instructions.