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making data visible and accessible across the network. It recognizes that in addition to predefined sets of
users, there will be unanticipated users requiring access to the data. The key tenet to this strategy is the
development, registration and publication of metadata. This allows developers full access information
about data made available and simplifies the creation of interfaces to feed the data to various applications.
Complete information regarding the DoD Net-Centric Data Strategy is available at the DoD Metadata
Registry and Clearing house at http://diides.ncr.disa.mil/mdregHomePage/mdregHome.portal.
UA SYSTEMS ENGINEERING
Implementing network interfaces between all UA systems and subsystems provides three key benefits:
(1) connects the UA to the GIG through either legacy, current, or programmed physical links - copper
wire, optical fiber, RF, laser (2) enhances the GIG’s aggregate data handling capacity, and (3) facilitates
separating UA functions, making it easier to create modular plug and play components.
Separate Physical Connection From Transport Protocol
UA systems do not have to wait until a net-centric wireless technology is fielded to connect to the GIG.
The physical connection between two nodes, be it wire, radio waves or light, merely transfers a signal
from one point in space to another. Embedded in that signal is the sequence of ones and zeros that
constitute the data being passed. IP based network connections can be implemented using any physical
connection. This makes it possible to connect legacy systems to the GIG by replacing tightly coupled,
unique data transfer implementations with IP based network connections. Creating an IP network based
transport layer separates the data transfer protocols from the physical connection and integrates UA into
the GIG regardless of the wireless technology employed (C-band, CDL, JTRS, LaserComm).
UAS ROADMAP 2005
APPENDIX C - COMMUNICATIONS
Page C-14
Contribute to the GIG’s Aggregate Bandwidth
Currently, UA communicate with their respective control elements via dedicated, point-to-point data
links. These data links provide continuous information handling capacity between the nodes, up to the
maximum data rate supported. During long cruise segments of a mission, however, traffic across the
dedicated link may drop to nearly zero. The closed system design precludes other users from taking
advantage of the unused bandwidth.
Implementation of an IP based, packet switched network interface, between UA systems with multiple
data links, control elements and other nodes, provides a path through the UA communications links
through which routers can pass packets during lulls in the primary system’s communications needs. Each
UA system adds its individual throughput capacity to the larger network. Access priority can be
controlled using QoS and COS technologies as defined by IEEE standard 802.1p giving top priority to the
primary system’s communications requirements. Looking at the operating theater’s communications
infrastructure as a whole, it becomes clear that implementing networked interfaces for all communications
links, not just UA, significantly increases data handling in theater, with no compromise to the data needs
of the primary system.
Separate UA Functions
In addition to migrating point to point links to network interfaces, UA components and functions must be
separated, modularized and connected using network interfaces. In keeping with the net-centric approach
to system design, Figure C-8 illustrates one approach to separating and modularizing UA components and
functions, within the UA. The platform’s local area network (LAN) connects sensors, sensor
management, and flight management units. The communications equipment connects to the WAN traffic
manager and links the platform LAN to other Local Area Networks. Within the control station (ground,
afloat, or airborne) the same approach applies. Consoles connect to the LAN, and the communications
equipment provides pathways between that LAN and other LAN segments.
FIGURE C-8. AIRCRAFT SYSTEMS ENGINEERING MODEL – IP FRIENDLY NETWORK INTERFACES.
Communications and infrastructure requirements for all UAS will be defined in terms of four key
functional interfaces.
Flight Control
Payload Control and
Product Dissemination
Weapons
Employment
Situational
Awareness
SATCOM
CDL/NDL/JTRS/WNW
ATC/ATM
Other
Interfaces
User User
Terrestrial
Control Station
UA
• Separable functional interfaces
• Modular payloads and weapons
• IP based network interfaces
• Standard Control Interface Mapping
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