Gps Positioning; Optic Flow And Ultrasonic Positioning - Zerotech DOBBY User Manual

Assistant Prompts

GPS Positioning

DOBBY uses a GPS&GLONASS dual-mode satellite positioning system. The satellite positioning system is
GPS based, with GLONASS acting as a supplementary system.
During outdoor flight, DOBBY uses GPS positioning when the number of searched-out GPS satellites≥8.

Optic Flow and Ultrasonic Positioning

DOBBY will use the optic flow and ultrasonic positioning during indoor flight. If the GPS signal is weak (the
number of searched-out GPS satellites<8) during outdoor flight, the aircraft will automatically use optic
flow and ultrasonic positioning for supplement.
The optic flow and ultrasonic positioning system combines dynamic image analysis to horizontally
position the aircraft during flight and ultrasonic distance measurement to determine the distance from the
ground. It positions the aircraft during indoor flight and assists the GPS positioning system during outdoor
flight.
The optic flow and ultrasonic positioning module is located on the base of the aircraft. It consists of an
optic flow camera and an ultrasonic sensor.
Usage Conditions and Restrictions
The optic flow and ultrasonic positioning system is used for indoor flight. It is also used for outdoor flight if
the GPS signal is weak. The operating height range for this positioning system is 0.5-3m.
When using this positioning system, after the aircraft has taken off and ascended to 0.5m, it will determine
if the requirements for using this system have been met. If they have not, it will initiate landing. If the
requirements are not met for this system during flight, the aircraft will also initiate landing.
Requirements for the optic flow and ultrasonic positioning system: When using this system, the area
underneath the aircraft needs to have a clear textured surface that is not too sparse or too dense. Users
can put a textured carpet or cloth on the ground, table or any large, horizontal surface to provide the
required textured surface.
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Solid Red
Fast Purple Flashing
Solid Green
Solid White
Critical Battery Warning
Compass Failure
Horizontal Compass Calibration
Vertical Compass Calibration
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