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The ICAO Annex 10 is discussing
shortly the more general case in the paras Att. C 2.4.10 through 2.4.12
indicating that the simple formulas given in para 2.4.9 are applicable
only for the simple ideal case ("based on geometrical abstractions").
The crude approximations would require
the realizsation of an adequate reflection plane for its sufficiently accurate
application. This can be very costly or sometimes impossible to achieve
that for a classical image type glideslope.
NAVCOM Consult states: The determination
of the TCH requires the determination of the common locus of the DDM=0.
In general, the glidepath angle and the TCH are generated on its full length
between the ILS points A and B by the entire reflection plane and cannot
be restricted to two simplifying parameters (forward and lateral slopes).
A number of difficult tridimensional
cases has been designed and published by NAVCOM Consult.
Flight check procedures must use the
measured measured DDM-values and its associated accurate coordinates (x,y,z)
and in case derived parameters: glidepath angle, the specified crossing
height (e.g. 16.5m) and the displacement sensitivity. An iterative data
processing of the measured data is necessary also.
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