東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

FindBook

Google Book

Amazon

博客來

Virtual Satcom, Long Range Broadband Digital Communications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Virtual Satcom, Long Range Broadband Digital Communications./
作者:	Watson, Dennis George.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	151 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
Contained By:	Dissertations Abstracts International82-01B.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27832384
ISBN:	9798617088559

Virtual Satcom, Long Range Broadband Digital Communications.
Watson, Dennis George.

Virtual Satcom, Long Range Broadband Digital Communications. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 151 p.

Source: Dissertations Abstracts International, Volume: 82-01, Section: B.

Thesis (Ph.D.)--Old Dominion University, 2020.

This item must not be sold to any third party vendors.

The current naval strategy is based on a distributed force, networked together with high-speed communications that enable operations as an intelligent, fast maneuvering force. Satellites, the existing network connector, are weak and vulnerable to attack. HF is an alternative, but it does not have the information throughput to meet the distributed warfighting need. The US Navy does not have a solution to reduce dependency on space-based communication systems while providing the warfighter with the required information speed.Virtual SATCOM is a solution that can match satellite communications (SATCOM) data speed without the vulnerable satellite. It is wireless communication on a High Frequency (HF) channel at SATCOM speed. We have developed an innovative design using high power and gain, ground-based relay systems. We transmit extremely wide-wideband HF channels from ground stations using large directional antennas. Our system starts with a highly directional antenna with a narrow beam that enables increased bandwidth without interfering with other spectrum users. The beam focus and power provide a high SNR across a wideband channel with data rates of 10 Mbps; 1000 times increase in HF data speed.Our modeling of the ionosphere shows that the ionosphere has more than adequate bandwidth to communicate at 3000 km and high speeds while avoiding detection. We designed a flexible structure adjustable to the dynamic ionosphere. Our design provides a high-speed communications path without the geo-location vulnerability of legacy HF methods.Our invention will benefit mobile users using steerable beamforming apertures with wide bandwidth signals. This dissertation will focus on three areas: an examination of the ionosphere's ability to support the channel, design of a phased array antenna that can produce the narrow beam, and design of signal processing that can accommodate the wideband HF frequency range.Virtual SATCOM is exciting research that can reduce cost and increase access to long-range, high data rate wireless communications.

ISBN: 9798617088559Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

Communications

Virtual Satcom, Long Range Broadband Digital Communications.
LDR:03226nmm a2200385 4500 001 2344562
005 20220531064553.5
008 241004s2020 ||||||||||||||||| ||eng d
020 $a 9798617088559
035 $a (MiAaPQ)AAI27832384
035 $a AAI27832384
040 $a MiAaPQ $c MiAaPQ
100 1 $a Watson, Dennis George. $0 (orcid)0000-0002-1112-837 $3 3683349
245 1 0 $a Virtual Satcom, Long Range Broadband Digital Communications.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 151 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
500 $a Advisor: Vahala, Linda;Popescu, Dimitrie.
502 $a Thesis (Ph.D.)--Old Dominion University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a The current naval strategy is based on a distributed force, networked together with high-speed communications that enable operations as an intelligent, fast maneuvering force. Satellites, the existing network connector, are weak and vulnerable to attack. HF is an alternative, but it does not have the information throughput to meet the distributed warfighting need. The US Navy does not have a solution to reduce dependency on space-based communication systems while providing the warfighter with the required information speed.Virtual SATCOM is a solution that can match satellite communications (SATCOM) data speed without the vulnerable satellite. It is wireless communication on a High Frequency (HF) channel at SATCOM speed. We have developed an innovative design using high power and gain, ground-based relay systems. We transmit extremely wide-wideband HF channels from ground stations using large directional antennas. Our system starts with a highly directional antenna with a narrow beam that enables increased bandwidth without interfering with other spectrum users. The beam focus and power provide a high SNR across a wideband channel with data rates of 10 Mbps; 1000 times increase in HF data speed.Our modeling of the ionosphere shows that the ionosphere has more than adequate bandwidth to communicate at 3000 km and high speeds while avoiding detection. We designed a flexible structure adjustable to the dynamic ionosphere. Our design provides a high-speed communications path without the geo-location vulnerability of legacy HF methods.Our invention will benefit mobile users using steerable beamforming apertures with wide bandwidth signals. This dissertation will focus on three areas: an examination of the ionosphere's ability to support the channel, design of a phased array antenna that can produce the narrow beam, and design of signal processing that can accommodate the wideband HF frequency range.Virtual SATCOM is exciting research that can reduce cost and increase access to long-range, high data rate wireless communications.
590 $a School code: 0418.
650 4 $a Electrical engineering. $3 649834
650 4 $a Technical communication. $3 3172863
650 4 $a Computer engineering. $3 621879
653 $a Communications
653 $a Ionosphere
653 $a Radio frequency
653 $a SATCOM
653 $a Wide bandwidth
653 $a Wireless
690 $a 0544
690 $a 0643
690 $a 0464
710 2 $a Old Dominion University. $b Electrical/Computer Engineering. $3 3351310
773 0 $t Dissertations Abstracts International $g 82-01B.
790 $a 0418
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27832384