Home' RTCA Documents for Review : C2 Link Systems MASPS_Draft Contents 6
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Systems Located on the Unmanned Aircraft (shaded orange)
Voice Communication System is the VHF voice radio(s) required to allow the remote
pilot to conduct voice communications through the VHF radio on the UA with an ATC
facility. This system would also tune to the frequency commanded by the remote pilot
and return status information about the radio(s). It also includes the conversion from
VHF analog audio to digitized (and compressed) speech for relay transmission over
the C2 Link and vice versa.
C2 Link System Management System is the system that supports the UA’s
management of the link(s) between the CS and the UA. Some of this management may
be directed by the UA, but the majority will be by messages passed through the C2
Link System from the remote pilot in the CS. This system controls switching between
the links that constitute the entire C2 Link System and the link configuration changes
required to manage the overall C2 Link System. This system includes monitoring
functionality necessary for the remote pilot to understand the status of the C2 Link
Flight Controls are the systems necessary to control and direct the UA’s path through
the sky. This system includes the ability to communicate data from the sensors
required to monitor the UA systems and consumables.
Navigation Systems and Sensors are the navigation sensors (e.g., Global Positioning
System (GPS) & Inertial Navigation Systems) and flight management functions (e.g.,
navigation database) that allow the UA to accurately fly the planned route of flight and
to transmit the UA position to the remote pilot.
Detect and Avoid (DAA) System is the combination of sensors, e.g., radar as specified
in DO-366 , and processing that meets the requirements of the current revision of
RTCA DO-365  to provide the DAA functionality. DO-365 describes optional
functionality for an automated UAS maneuver to avoid collisions. This capability is
assumed to not be implemented by UAS approved using this MASPS.
C2 Link System (shaded green)
The functionality of link systems is not specifically defined in this MASPS document but
will be defined in MOPS documents written for the different available links used to provide
the connectivity between the CS and the UA.
Link Systems (1 to N) include the components of the C2 Link System that allow the
CS to be connected to the radio systems on the UA. These links may include network
functionality or have the CS connected directly to a ground radio system. They can
consist of satellite, terrestrial, or a combination of both types of links. The specific
connectivity path is not specified in this MASPS as it could consist of several existing
and planned link and network types. (An expanded description of these type of systems
is given in Section 22.214.171.124.)
Possible Configurations of a C2 Link System
As noted above, there are many possible implementations of links and networks that can
be used to establish a CS and UA. Figure 1-3 shows the four basic possibilities (see the
brown, gray, green, and blue sets of shaded areas) that were considered in drafting this
document; they represent a systems view of the four possible connections to the UAs
shown in Figure 1-1.
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