Home' RTCA Documents for Review : MOPS GNSS Aviation Antenna-FRAC Release Contents 20
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2. The GNSS Active antenna is intended to be an integrated active antenna that meets
the A743-A5 [RD-4] footprint. The total height of the antenna should not exceed
Equipment Performance - Environmental Conditions
The environmental tests and performance requirements described in this subsection are
intended to provide a laboratory means of determining the overall performance
characteristics of the antenna under conditions representative of those that may be
encountered in actual operations.
Some of the environmental tests contained in this subsection need not be performed unless
the manufacturer wishes to qualify the equipment for that particular environmental
condition. These tests are identified by the phrase "When Required." If the manufacturer
wishes to qualify the equipment to these additional environmental conditions, then these
"When Required" tests shall be performed.
Unless otherwise specified, the test procedures applicable to a determination of antenna
performance under environmental test conditions are set forth in RTCA Document
DO-160G, Environmental Conditions and Test Procedures for Airborne Equipment.
General information on the use of DO-160G is contained in Sections 1.0 through 3.0 of
that document. In addition, a method of identifying which environmental tests are
conducted and other amplifying information on the conduct of the tests is contained in
Appendix A of DO-160G.
Some of the performance requirements in Section 2.2 are not required to be tested to all of
the conditions contained in DO-160G. If judgment and experience indicate that these
particular performance parameters are not susceptible to certain environmental conditions,
and that the level of performance specified in Section 2.2 will not be measurably degraded
by exposure to these particular environmental conditions, such tests may be omitted.
In addition to the exceptions above, certain environmental tests contained in this section
are not required for minimum performance equipment unless the manufacturer wishes to
qualify the antenna for additional environmental conditions. If the manufacturer wishes to
qualify the antenna to these additional conditions, then these tests shall be performed.
The purpose of the tests are to ensure that both operational performance and survivability
requirements have been met per the procedures outlined in Scn. 2.3.1. According to DO-
160G multiple test articles may be used, tests may be performed in any order, and separate
test articles may be used for demonstrating compliance with the separate tests. It should be
noted that the sand and dust test are not to be conducted prior to the salt fog or humidity
tests. However, the DC interface requirement (Section 2.2.12) shall be performed on the
antenna test article that was subjected to the Burnout Limit (Section 2.2.9) test requirement.
Specific Environmental Test Conditions
The equipment shall be subjected to the test conditions as specified in DO-160G as
indicated below (Table 2-5). For some test conditions, the performance parameters must
be met during the environmental stimulus, while for others, the performance parameters
must be met after the stimulus. For the G/T ratio performance parameter, a “hot-cold” noise
test at boresight is an acceptable alternative that can be performed before and after the
environmental stimulus, to identify any relative performance change. Categories are for
locations external to the aircraft.
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