using Gigabit Ethernet (1000 Mbps service) over fiber or Category 5 (CAT5) copper cabling, the following physical layer and framing standard is mandated:
.
ISO/IEC 8802-3:2000 (IEEE Std. 802.3, 2000 Edition).
DATA LINK STANDARDS
Common Data Link/STANAG 7085
In 1991, and again in 1994, the Assistant Secretary of Defense (ASD) for command, control, communications, and intelligence (C3I), now ASD for networks and information integration (NII), mandated the use of common data link (CDL)1 for wideband transmission of imagery and signals intelligence data from airborne intelligence, surveillance, and reconnaissance (ISR) platforms to ground processing facilities.2. ASN(C3I) updated these memoranda on 19 June 20013, directing the use of CDL for all wideband ISR Air-to-Air and Air-to-Ground (but not Air-to-Satellite) data links.
Basic CDL is a full-duplex, jam resistant spread spectrum, point-to-point digital link. The uplink operates at 200 Kbps, 400 Kbps, 2 Mbps, 10.71 Mbps, 22.4 Mbps, or 45 Mbps. The downlink can operate at 10.71 Mbps, 22.4 Mbps, 45 Mbps, 137 Mbps, or 274 Mbps. In addition, rates of 548 Mbps and 1096 Mbps may be supported in the future. A Time Division Multiplexer (TDM) scheme is incorporated in the specification. This allows each CDL system to be configured to support many platforms, sensor systems, and remote control & reception systems. While this has allowed many applications of CDL to succeed as individual systems, it has resulted in a host of systems that cannot share capabilities because of the unique applications of configuration.
As the number of systems using CDL are developed and fielded, this issue has continued to grow. Use of motion imagery and other data collected by manned and unmanned sensor platforms has become increasingly important to the war fighter, the proliferation of sensors and platforms that use CDL has raised the military Services’ interest in assuring interoperability.
1 “CDL” denotes a family of full-duplex, jam-resistant, point-to-point microwave communication links developed by the US Government and used in imagery and signals intelligence (SIGINT) collection systems. CDL is defined by the Common Data Link Waveform Specification, Revision F, November 2002. In a 1996 affordability initiative to broaden potential CDL applications, the Defense Airborne Reconnaissance Office (DARO) and the Defense Advanced Research Projects Agency (DARPA) developed a narrow-band version of CDL (at that time limited to data rates up to 10.71 Mbps), which was designated Tactical Common Data Link (TCDL). TCDL is evolving into a full-bandwidth (up to 274 Mbps) technology that is light-weight and relatively low-cost, is fully compliant with the CDL specifications, but may not be as feature-rich or environmentally capable as traditional CDL systems.
2 ASD (C3I) Memorandum, Common Data Link (CDL) Policy, 18 October 1994.
3 ASD(C3I) Memorandum, Common Data Link (CDL) Policy, 19 June 2001
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：无人机系统路线图 Unmanned Aircraft Systems Roadmap(150)
