EMSIS – User’s and Installation Manual
The acceleration sensors are measuring apparent gravity vector. The true gravity vector is
calculated assuming coordinated flight and readings from the other sensors (velocity and angular
rate sensors). The ball slip indicator is directly obtained from the acceleration sensors.
The absolute pressure sensor is used to calculate altitude and vertical velocity (vario).
The differential pressure sensor provides indicated airspeed (IAS). When it is coupled with the
outside air temperature (OAT) sensor, it also calculates true air speed (TAS).
Assuming coordinated flight, we calculate the referencing attitude from the gravity vector and heading.
These values are then compared with the short-term prediction of the attitude. Non-linear Kalman filters
are used to combine the short-term prediction and referencing attitude solution into one most probable
solution. This is what you see on the attitude indicator.
In a very similar way, short-term inertial position prediction is compared with the GPS position. Again,
Kalman filtering is used to obtain the final solution.
When engine monitoring unit (DAQU) is present on CAN bus, EMSIS PFD can also show relevant engine
and fuel information.
When maps are enabled and licensed, EMSIS PFD can also show raster maps on graphical display. Further
chapters reveal the details.
4 General Information about EMSIS EMS
EMSIS EMS consists of electronic units which work closely together to bring engine and fuel information
onto graphical display. The system is presented on Figure 3. The system consists of the following
electronic components:
Engine monitoring unit (DAQU) is used to connect the engine, fuel and electric sensors.
EMSIS EMS unit presents all relevant information that appears on the CAN bus in a pilot friendly
form on LCD screen. Most of this manual describes how to access, read and interact with the
EMSIS display.
Figure 3: Illustration of EMSIS EMS configuration.
When AHRS unit is present on CAN bus, EMSIS EMS can also show flight information on graphical
display, too.
When maps are enabled and licensed and AHRS unit is present on CAN bus, EMSIS EMS can also show
raster maps on graphical display. Further chapters reveal the details.
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