Optical Flow Position And Ultrasonic Altitude Hold - C-Fly Faith2 Pro Operation Manual

turn on the device, there is a probability that the file will be repaired automatically. Cfly are
not responsible for any damage caused by unreadable videos and photos.
● Please use and store the camera within the nominal temperature and humidity range to keep
the camera lens in good condition.
● For dirty or dusty lens surface, it is recommended to clean the lens with a professional lens
cleaning tool to avoid damaging the lens or affecting the image quality.
● Make sure the camera is not covered by any shade, otherwise the high temperature may
cause damage to the camera and even burn you or others.

8. Optical flow position and ultrasonic altitude hold

The aircraft is equipped with optical flow position and ultrasonic altitude hold system, which
provides better environmental adaptability.
The optical flow positioning system is located at the bottom of the fuselage. As shown the
camera module ② , optical flow positioning system obtains aircraft position information
through image.
The ultrasonic height determination system consists of a pair of ultrasonic sensor modules ①
(transmitter and receiver). The ultrasonic sensor can measure the current aircraft height by
ultrasonic.
Optical flow position system
The optical flow position system is typically used in indoor environment when GPS is weak or
unavailable. It works best when the altitude is less than 3 meters.
Note:
● The precision of the optical flow position 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 optical flow position sensor and ultrasonic sensor are both not available,
aircraft will switch to altitude mode automatically. Be cautious to operate the Aircraft in the
following situation.
(1) Fly fast at an altitude below 0.5m.
(2) Fly over monochrome surfaces (like pure black, pure red, pure red and pure green).
(3) Fly over strong light reflective surfaces or surfaces prone to reflection.
(4) Fly over water or transparent object surfaces.
(5) Fly over moving object surfaces (such as crowds, swaying juggles and glass).
(6) Fly over an area where light changes dramatically and rapidly.
(7) Fly over surfaces extremely dark (lux<10) or extremely bright (lux>10,000).
(8) Fly over material surfaces that absorb ultrasonic waves (like thick carpet).
(9) Fly over surfaces without clear textures.
(10) Fly over surfaces with highly repeating textures (small grid brick in the same color).
(11) 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 aircraft is 1 meter against the
ground, the flying speed should not be over2m/s; when the aircraft 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 aircraft 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 Aircraft is flying over water, low light
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