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GPIP (Intersection with local level
plane through LTP/FTP)
FPAP GARP
FPAP and GARP have same
ellipsoid height as LTP/FTP
Angle of full scale deflection = tan-1
DCP
Course width
D
DCP — datum crossing point
FAS — final approach segment
FPAP — flight path alignment point
FTP — fictitious threshold point (see Figure D-7)
GARP — GBAS azimuth reference point
GPA — glide path angle
GPIP — glide path intersection point
LTP — landing threshold point
TCH — threshold crossing height
FAS path
Figure D-6. FAS path definition
ATT D-57 23/11/06
Annex 10 — Aeronautical Communications Volume I
Course width
D
Full scale deflection = tan-1
Runway
Course width FTP
D
GARP
FPAP
305 m
FAS
path
FAS — final approach segment
FPAP — flight path alignment point
FTP — fictitious threshold point
GARP — GBAS azimuth reference point
Plan view:
Figure D-7. FAS path definition for approaches
not aligned with the runway
23/11/06 ATT D-58
Attachment D Annex 10 — Aeronautical Communications
DCP — datum crossing point
FAS — final approach segment
FPAP — flight path alignment point
FTP — fictitious threshold point (see Figure D-7)
GARP — GBAS azimuth reference point
GPA — glide path angle
GPIP — glide path intersection point
LTP — landing threshold point
TCH — threshold crossing height
Aircraft
LTP/FTP
FPAP
Plan view
GARP
D
FAS path
Aircraft
Profile view
GPA DCP
TCH
LTP/FTP GPIP
H
FAS path
Figure D-8. Definition of D and H parameters in alert limit computations
ATT D-59 23/11/06
Annex 10 — Aeronautical Communications Volume I
P0.1
E0.025
E0.075
E0.1
L0.025
L0.075
L0.1
(E – L)0.1
Figure D-9. “Close-in” correlation peak and measured correlator values
___________________
23/11/06 ATT D-60
ATTACHMENT E. GUIDANCE MATERIAL ON THE
PRE-FLIGHT CHECKING OF VOR AIRBORNE EQUIPMENT
1. Specification for a VOR airborne equipment test facility (VOT)
1.1 Introduction
For the guidance of States wishing to provide a test signal for the pre-flight checking of VOR airborne equipment, suggested
characteristics for a VOR airborne equipment test facility (VOT) are given hereafter.
1.2 General
1.2.1 The VOT must be designed to provide signals that will permit satisfactory operation of a typical VOR aircraft
installation in those areas of the aerodrome where pre-flight checking is convenient and desirable.
1.2.2 The VOT must be constructed and adjusted so that the VOR bearing indicator in the aircraft will indicate zero
degrees “FROM” when the receiver has not departed from calibration. This indication remains constant irrespective of the
aircraft's angular position with respect to the VOT within the intended coverage.
1.2.3 In view of the manner in which use is made of a VOT, there is no fundamental need for its duplication at any one
site.
1.2.4 The VOT is required to radiate a radio frequency carrier with which are associated two separate 30 Hz
modulations. The characteristics of these modulations should be identical with the reference phase and variable phase signals
associated with VOR. The phases of these modulations should be independent of azimuth and should be coincident with each
other at all times.
1.3 Radio frequency
The VOT should operate in the band 108 to 117.975 MHz on an appropriate VOR channel selected so as not to interfere with
any VHF navigation or communication services. The highest assignable frequency is 117.95 MHz. The frequency tolerance
of the radio frequency carrier should be plus or minus 0.005 per cent, except as specified in Chapter 3, 3.3.2.2 and 3.3.2.3.
1.4 Polarization and accuracy
1.4.1 The emission from the VOT should be horizontally polarized.
1.4.2 The accuracy of the “bearing” information conveyed by the radiation from the VOT should be plus or minus
1 degree.
Note.— Since the two modulations on the radio frequency carrier are in phase coincidence at all times, the vestigial
vertically polarized energy will have no effect on the accuracy of the facility.
ANNEX 10 — VOLUME I ATT E-1 23/11/06
Annex 10 — Aeronautical Communications Volume I
1.5 Coverage
1.5.1 Coverage requirements, and hence the power which must be radiated, will necessarily depend to a considerable
extent on local circumstances. For some installations, a small fraction of 1 W will suffice while in other cases, particularly if
　
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