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CMC electronic Esterline CMA-5024 User Manual

CMC electronic Esterline CMA-5024
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INSTALLATION MANUAL
CMA-5024 GLSSU
This document includes Proprietary Information and shall not be reproduced or communicated to third party
without prior written permission by CMC Electronics Inc.
Page E.12
November 21, 2008
(9) Automatic K
H
Selection
The outputs of type “GPS bus” always use the fixed scaling corresponding to the Off setting;
this APD affects only outputs of type “GLS bus”. This setting does not affect the internal
scaling of the protection level; it only affects the data on an ARINC 429 output of type “GLS
bus”.
When On, the K
H
factor used to compute the SBAS-based Protection Level in the HIL output
label 130 on the ARINC 429 outputs of type “GLS bus” is based on SBAS PA mode.
When Off, the K
H
factor used to compute the horizontal SBAS-based Protection Level in the
HIL output label 130 on the ARINC 429 outputs of type “GLS bus” is fixed to the value of
6.18 that corresponds to all phases of flight from en route to LNAV approaches.
The scaling of the horizontal SBAS-based Protection Level defines the probability that the
protection level bounds the position error. For en route through LNAV approach, the
protection level bounds the horizontal radial position error with a probability of 1 - 10
-7
per
hour except possibly for brief periods less than the time-to-alert. This requires a scaling of
6.18. For LNAV/VNAV, LP, and LPV approaches, the probability that the horizontal cross-
track error exceeds the protection level must be within 2x10
-7
per approach. This requires a
scaling of 6.0.
This setting is selected to match the capability of the user of the bus data. For typical retrofit
applications with a TSO-C129a FMS, the setting is Off. Only an FMS upgraded to perform
SBAS LNAV/VNAV, LP, or LPV approaches may used an On setting; it could also retain the
Off setting and perform the scaling itself or use deviations provided by the GLSSU.
(10) Measurement Block Integrity
When On, the integrity of the measurement block outputs is reported using the Detection bit
in the HIL label 130 and the Measurement Status label 060. When the HIL label SSM is
Normal Operation and its Detection bit reports No failure, the ephemeris based (per Satellite
Position Data Used bit on label 060) measurements output on the bus have been verified for
satellite errors by RAIM or SBAS unless explicitly excluded as indicated by the SVID
Status/Isolation bit of label 060. The HIL value can be used to assess the level of integrity for
measurements included in the navigation solution; other measurements were assessed by a
RAIM verification that supports a HIL < 2 nm.
When Off, measurements may be output even when they have not been screened for
satellite failures; the integrity risk must then be assumed by the user of the data. In any case,
measurements from unhealthy satellites are not provided when ephemeris data is used for
the satellite position.
The Off setting provides the maximum number of satellites in all cases. The On settings
ensures that an integrity check has been made but can result in fewer satellite
measurements when there is a failure in progress on a satellite that is not used in the
navigation solution but is otherwise reported as healthy.
This setting is selected to match the integrity required by the user of the measurement block
data. Select On when all the users of the measurement block outputs do not explicitly accept
the associated integrity risk.
34-52-81-1
The document reference is online, please check the correspondence between the online documentation and the printed version.

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CMC electronic Esterline CMA-5024 Specifications

General IconGeneral
BrandCMC electronic
ModelEsterline CMA-5024
CategoryAccessories
LanguageEnglish

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