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Vision Positioning System
The Vision Positioning System is typically used in indoor environment when GPS is weak or unavailable. It works best
when the drone altitude is less than 3 meters.
Note
• The precision of the vision system is easily affected by the light strength and features of the surface textures. It
would happen if the ultrasonic sensor could not work normally to detect the altitude when it is flying over objects
that is made by sound-absorbing materials. Once the vision sensor and ultrasonic sensor are both not available,
drone will switch to altitude mode automatically. Be cautious to operate the drone in the following situation.
• Fly fast at an altitude below 0.5m.
• Fly over monochrome surfaces (like pure black, pure red, pure red and pure green).
•
Fly over strong light reflective surfaces or surfaces prone to reflection.
• Fly over water or transparent object surfaces.
• Fly over moving object surfaces (such as crowds, swaying juggles and glass).
• Fly over an area where light changes dramatically and rapidly.
• Flyover surfaces extremely dark (lux<10) or extremely bright (lux>10,000).
• Fly over material surfaces that absorb ultrasonic waves (like thick carpet).
• Fly over surfaces without clear textures.
• Fly over surfaces with highly repeating textures (small grid brick in the same color).
• Fly over surfaces that are tilting over 30 degrees (could not receive the echo of the ultrasonic wave).
•
Flying speed should be controlled not to be too fast. When the drone is 1 meter against the ground, the flying
speed should not be over2m/s; When the drone is 2 meter against ground, the flying speed should not be over
5m/s.
• Keep sensors clean at all the time.
• The vision system is only effective when the drone is within the altitude of 3 meters.
• Make sure that the light is bright enough and the surfaces is with clear textures so that the vision system can
acquire the movement information through recognizing the ground textures.
•
The vision system may not function properly when the drone is flying over water, low light ground and surfaces
without clear patterns or textures.
• Do not use other ultrasonic device with a frequency of 40KHz when the vision system is in operation.
• Since the visual positioning will emit ultrasonic waves that human ears cannot perceive, the ultrasonic waves may
cause the animals to be uneasy, please stay away from the animals when using.
