The radio-navigation subsystem GSerr
The block GSerr (Glideslope steady-state
errors) is contained in the sublibrary ILS of the blocklibrary
NAVLIB. It computes the steady-state error
in the glideslope signal, caused by the ground equipment. The magnitude of
the error is computed according to ICAO guidelines. Both glideslope
misalignment and steady-state errors in the glideslope sensitivity can be
taken into account. See the references below for
more info about the theoretical backgrounds.
Other blocks in the ILS sublibrary of NAVLIB are: Nominal ILS signals, GSnoise, LOCerr, and
LOCnoise, and the example system ILS example.
Inputsignal
Nominal value of the glideslope current
i_gs,
[micro-Ampere]
Outputsignal
Glideslope current
i_gs, including steady-state errors,
[micro-Ampere]
Block-parameters
-
performance category (1, 2, or 3, see the References for more info)
-
percentage of maximum allowable error in glideslope sensitivity
(i_gs = S_gs * epsilon_gs, where
i_gs is the glideslope current through the cockpit
instrument, epsilon_gs is the angle between the line from
aircraft's c.g. to glideslope antenna and nominal glide path, and
S_gs is the glideslope sensitivity)
-
percentage of maximum allowable glideslope misalignment
-
nominal glideslope elevation angle
The block-parameters can be specified in dialog-boxes which appear after
double-clicking the block GSerr.
Apart from the FDC user-manual, the following references contain more information about the ILS signals:
-
M.O. Rauw: A Simulink environment for Flight Dynamics and Control
analysis - Application to the DHC-2 'Beaver', part I:
Implementation of a model library in Simulink. Delft University
of Technology, September 1993
-
Anon.: Approach and Landing Simulation. AGARD report 632, Ames,
1975