dji P4 MULTISPECTRAL User Manual page 22

P4 Multispectral User Manual
Follow the steps below to use Vision Positioning:
1. Turn on the aircraft. The aircraft status indicator will flash green two times, which indicates the
Vision Positioning is ready.
2. Gently push the left stick up to lift off and the aircraft will hover in place.
Assisted Braking from Obstacle Sensing
Powered by the Obstacle Sensing, the aircraft will now be able to actively brake when obstacles
are detected around the aircraft. Note that Obstacle Sensing function works best when lighting
is adequate and the obstacle is clearly marked or textured. The aircraft must fly at no more than
31mph (50kph) to allow sufficient braking distance.
The 3D Infrared Sensing System is only active in Beginner mode* and Tripod mode*. Fly with caution.
The performance of your Vision System and Infrared Sensing System are affected by the surface
being flown over. Ultrasonic sensors may not be able to accurately measure distances when
operating above sound-absorbing materials and the camera may not function correctly in suboptimal
environments. The aircraft will switch from P-mode to A-mode automatically if neither vision sensors
nor ultrasonic sensors and Infrared Sensing System are available. Operate the aircraft with great
caution in the following situations:
a) Flying over monochrome surfaces (e.g. pure black, pure white, pure red, pure green).
b) Flying over a highly reflective surfaces.
c) Flying at high speeds of over 31mph (50kph) at 2 meters or over 11mph (18kph) at 1 meter.
d) Flying over water or transparent surfaces.
e) Flying over moving surfaces or objects.
f) Flying in an area where the lighting changes frequently or drastically.
g) Flying over extremely dark (lux < 10) or bright (lux > 100,000) surfaces.
h) Flying over surfaces that can absorb sound waves (e.g. thick carpet).
i) Flying over surfaces without clear patterns or texture.
j) Flying over surfaces with identical repeating patterns or textures (e.g. tiling).
k) Flying over inclined surfaces that will deflect sound waves away from the aircraft.
l) Flying over obstacles with too small effective infrared reflective surface.
m) DO NOT position the sides of two aircraft toward each other to avoid interference between the
3D infrared modules.
n) DO NOT cover the protective glass of the infrared module. Keep it clean and undamaged.
o) Flying at high speed at low altitude (under 0.5 m).
Keep sensors clean at all times. Dirt or other debris may adversely affect their effectiveness.
Vision Positioning is only effective when the aircraft is at altitudes of 0.3 to 10 meters.
The Vision Positioning may not function properly when the aircraft is flying over water.
The Vision 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 System is in operation.
* This mode will be supported later.
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