曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
A cursory review of current methods for radio development and deployment highlights the need for a more flexible, joint approach to procuring interoperable radio systems.
APPENDIX C - COMMUNICATIONS
Page C-1
Global Hawk
The RQ-4 Global Hawk system consists of the aircraft, Launch and Recovery Element (LRE) and Mission Control Element (MCE). The LRE controls the aircraft via line-of-sight (LOS) CDL, LOS ultra high frequency (UHF), and beyond line-of-sight (BLOS) UHF radios. The LRE has no provision for sensor control or product receipt. The MCE contains all of the aircraft control functions of the LRE. In addition, the MCE provides for sensor control as well as receipt and dissemination of the product. The MCE maintains situational awareness. MCE aircraft command and control is accomplished using narrow band LOS UHF radio and UHF satellite communications (SATCOM), with Inmarsat as a back up command and control link. The LOS CDL as well as Ku-band SATCOM provide command and control channels as well. Sensor data flows from the aircraft to the MCE via either LOS CDL or Ku-band SATCOM.
Global Hawk provided extensive mission support during OEF in Afghanistan. The LRE launched the Global Hawk from a forward operating location. Shortly after launch, the LRE transferred mission control to the forward-deployed MCE. During combat operations, Global Hawk initially flew a preplanned mission, but quickly transitioned to an ad-hoc operation. For a more complete understanding of preplanned, replanned, ad hoc and autonomous missions, refer to the section entitled UA Actions. Global Hawk transmitted images to the MCE via commercial Ku-band SATCOM at 20 Mbit/s. The MCE then routed the imagery to the collocated forward exploitation element or to a wide area network (WAN) inject point to access a fiber optic landline to the Continental United States (CONUS) based reach-back facility. The CONUS based exploitation center processed the imagery and forwarded products via Ku-band SATCOM at 6-8 Mbit/s to an high-capacity image product library or directly to the CAOC for use in current operations. The Distributed Common Ground System (DCGS) supported the exploitation effort.
Operators used the experience gained from Global Hawk activities in OEF to streamline operations during OIF. Again, the LRE launched the aircraft from a forward operating location; however, all operations were performed using reach-back to the MCE located in the CONUS, not forward deployed. Communication between the MCE at Beale AFB, the CAOC, and the aircraft used a combination of WAN landline and commercial Ku-band SATCOM (with transmission rates from 20-40 Mbit/s). Inmarsat was the redundant C2 link. Global Hawk again flew both preplanned and ad hoc missions in theater. It used Ku-band SATCOM for both command and control and imagery dissemination to the CONUS based MCE. WAN landline provided communications between the MCE and the analysts. Analysts searched for ad hoc targets and passed them directly to the CAOC via Ku-band SATCOM. If determined to be time-critical, targets were passed to in-flight fighters/bombers via Link-16 message. Figure C-1 depicts the Global Hawk communications architecture for both deployed and in garrison operational modes.
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(108)
