DCS: Mirage F1 Flight Manual
Version 1.0
61
3.14 NAVIGATION SYSTEM
Description
The Mirage F1 CE is equipped with gyroscopes and a radionavigation suite with a TACAN and a
VOR-ILS. Newer models, such as the F1 EE are also equipped with an inertial navigation system.
The Mirage F1M also carries a GPS suite.
Gyroscopic system
The aircraft carries a main gyroscopic system and an emergency gyroscope that feed information
to other systems such as the sight, the spherical indicator, the autopilot or the navigation
indicator (IDN). The aircraft also carries a standby horizon.
The main gyroscopic system is composed of a vertical gyroscope, which provides pitch and roll
information, and a gyromagnetic system, providing heading information (generally slaved to the
magnetic field of the Earth). In turn, the gyromagnetic system is composed by a longitudinal
gyroscope and a magnetometer. The system has 3 operation modes: gyromagnetic (with the
magnetometer providing corrections to the gyroscope) and purely magnetic and emergency, in
which the heading input is taken from the emergency gyroscope.
The emergency gyroscope only provides heading information and is also slaved to the magnetic
field of the Earth through another magnetometer.
The spherical indicator provides attitude and heading indication.
Radionavigation
As mentioned above, the aircraft is equipped with both a TACAN and a VOR/ILS system. The
heading, distance and flight slope information generated by these systems is used by the
autopilot, the navigation indicator and the spherical indicator navigation pointers. The route
commutation unit can be used to select the source of the radionavigation input to the pointers.
The TACAN is a MITAC model with 3 modes: receive, transmit/receive and air to air. The
transmit/receive mode allows for ranging information to be obtained by the system. Valid
channels are from 01 to 116 in both X and Y. It can be tested.
The VOR provides information of radial and bearing towards the VOR station, while the ILS
provides localizer and glideslope information for the instrumental approach to a runway. It can
tune in frequencies from 108 to 117,95 MHz with a spacing between channels of 50 kHz. It can
be tested.
Navigation indicator (IDN)
The navigation indicator is an instrument that can display an arrange of bearings from different
radio sources: the TACAN, the VOR and the radar. If the system has distance and bearing
information from the TACAN, an ‘additional vector’ function can be used. This function
essentially allows the pilot to get bearing information to any point relative to a TACAN station.
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