ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 2-39
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
Table 2-6. Navigation Data (Continued)
Description
Priority
Labels
GNSS Sensor Status
In some instances, these
labels will not be available.
273 GNSS sensor status
101 GNSS HDOP
(2)
There are no criteria on selecting a navigation solution when having 2 equal preference
valid navigation solutions. Any method of selection is acceptable.
(3)
For each navigation solution, the ACD remains with its current label(s) until one of the
following occurs:
(a)
Label invalid or no longer present.
(b)
a higher priority, valid label becomes available on the same or another interface
after 5 minutes (±30 seconds hysteresis).
B.
RF Power Control
(1)
The SDU is designed to interface and control multiple RF configurations. These vary in
the following ways:
(a)
Standalone or co-packaged HPA
(b)
Standalone or co-packaged DLNA
(c)
Gain of antenna
(d)
Type of antenna
(e)
Number of Antenna
(f)
Control Interfaces.
(2)
The RF configuration items are generally ORT specified, but in some cases, such as type
of antenna, they may also be communicated by the Antenna.
(3)
The ACD manages the EIRP of each RF carrier to the level associated with the ORT
identified terminal class.
(4)
Based on ORT settings the ACD determines Antenna Gain by the antenna gain reports.
(5)
In a multichannel SDU, the RF power management algorithm:
(a)
Maintain the Aircraft EIRPs for established carriers.
(b)
Determine the availability of RF power for additional RF carriers.
(c)
Maintain the HPA within its operating limits (e.g., to satisfy intermodulation
products requirements).
(d)
Prioritize the allocation of available RF power to multiple carriers, with regard to
the priority of each related service.
(6)
The ACD calculates the back-off to send to the HPA considering the following:
(a)
EIRP level for the ORT selected class of operation
(b)
Installed static losses
(c)
Gain performance of the installed antenna
(d)
HPA gain.
DRAFT
3rd rvw Draft as of:
29 January, 2020
Summary of Contents for 90402651-000
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