User manual

Table Of Contents

Aircraft

Phantom 4

User Manual

The performance of your Vision Positioning System is affected by the surface over which it is

ying. The ultrasonic sensors may not be able to accurately measure distances when operating

above sound-absorbing materials. In addition, the camera may not function correctly in

suboptimal environments. The aircraft will switch from P-mode to A-mode automatically if neither

GPS nor Vision Positioning System are available. Operate the aircraft with great caution in the

following situations:

Flying over monochrome surfaces (e.g. pure black, pure white, pure red, pure green).

Flying over a highly reective surfaces.

Flying at high speeds(over 10 m/s at 2 meters or over 5 m/s at 1 meter).

Flying over water or transparent surfaces.

Flying over moving surfaces or objects.

Flying in an area where the lighting changes frequently or drastically.

Flying over extremely dark (lux < 10) or bright (lux > 100,000) surfaces.

Flying over surfaces that can absorb sound waves (e.g. thick carpet).

Flying over surfaces without clear patterns or texture.

Flying over surfaces with identical repeating patterns or textures (e.g. tiles with the same design).

Flying over inclined surfaces that will deect sound waves away from the aircraft.

Keep the sensors clean at all times. Dirt or other debris may adversely affect the effectiveness

of the sensors.

Vision Positioning is only effective when the aircraft is at altitudes of 0.3 to 10 meters.

The Vision Positioning System may not function properly when the aircraft is ying over water.

The Vision Positioning System may not be able to recognize pattern on the ground in low light

conditions (less than 100 lux).

Do not use other ultrasonic devices with frequency of 40 KHz when Vision Positioning system is

in operation.

Keep the animals away from the aircraft when Vision Positioning system is activated. The sonar

sensor emits high frequency sounds that are only audible to some animals.

Assisted Brakingfrom Obstacle Sensing System

obstacles are detected direct ahead of the aircraft. Note that Obstacle System works best when light

condition is ideal and the obstacle does not have feature-less pattern. In addition, the aircraft speed

cannot exceed over 10 meter/second so that the aircraft can break and stop at the safe distance.