Dji Phantom 2 Vision + User Manual download pdf (Page 5)

Good to Know before you Go

Flight Control System

IMU or Inertial Measurement Unit

An inertial measurement unit, or IMU, is an electronic device that measures and reports on a craft's velocity, orientation,

and gravitational forces, using a combination of accelerometers and gyroscopes, sometimes also magnetometers.

IMUs are typically used to maneuver aircraft, including unmanned aerial vehicles (UAVs). The altitude part is the

barometric altimeter that measures altitude based on air pressure. The IMU works by taking readings from

ACCELEROMETER (this is movement in straight lines (forward, backward, side to side, and up and down ) and also

takes readings from GYROSCOPE (spinning or rotating, and pitching movement ), and finally GPS (where the phantom

a located in space) (latitude, longitude, altitude).

Some Specs (1m = 3.28084ft)

- Communication Distance (Open Area): Remote Control in CE/FCC mode: 400m/800m / Range Extender: 500-700m

- Vertical hover accuracy is +/- .8m (GPS/ATTI); Horizontal hover accuracy is +/- 2.5m (GPS only)

- Max Ascent Speed: 6m/s

- Max Descent Speed: 2m/s

- Max Flight Speed: 15m/s (not recommend)

Communication (5.8Ghz/2.4Ghz) explained

1. Your RC Controller and the Phantom do not talk to each other – that is, the RC Controller controls the Quadcopter

mostly in a one-way fashion. This occurs on one particular wireless frequency – 5.8Ghz. Most other multirotors use

2.4Ghz, but DJI uses the 5.8Ghz so that it won’t interfere with the second video/telemetry channel – which is what your

smart phone and the DJI repeater use!

2. The second channel – which allows video/telemetry – is a constant connection between your smartphone/tablet, the

DJI repeater/range-extender (small box on the RC Controller handle) and the Phantom. This channel is at 2.4Ghz.

3. In addition to the above, the Phantom is also constantly receiving signals from GPS satellites – all of this data

combines with #1 and #2 above to provide the information for safe and effective flight.

The reason for the repeater/range-extender is to amplify the wireless signal so that the range is increased. As you know,

your home wireless network can max out at 46m indoors/92m outdoors or so. DJI claims a range of 500-700m for the

Phantom telemetry, although this can vary with the terrain, weather, interference, etc.

The control signal is more or less line of sight though it extends far beyond where one could actually see the Phantom.

And, of course, the signal does get through "open" objects (like winter trees) and bends (somewhat) around solid

objects but be careful anyway as it might not always be the case; it depends a lot of your actual surrounding.

Need to Know: You’ll get a “Control Signal Lost” warning if you lose the First Channel - 5.8 Ghz: this will activate the

FAILSAFE mode. You’ll get a “Phantom Connection Lost” warning if you lose the Second Channel - 2.4Ghz: in which

case, you will lose Video and Telemetry feeds. Be sure to check the “Be prepared for the Worst” section.

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Dji Phantom 2 Vision + User Manual Page 5