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Current DoD requirements call for a single enterprise terminal supporting up to 48/96 (threshold/objective) transmit and 56/112 (threshold/objective) receive communications carriers, not considering future expansion. The number of links supported by an enterprise terminal dictates aggregate servicing capacity. A single teleport/standardized tactical entry point (STEP) site can consist of five or more...
For ease of implementation, communications systems have been steadily converted to digital implementations. FPGA technologies and high-quality, high-speed DACs have enabled this trend. While this is commonly done for modern high bit-rate communications systems, legacy systems like the MIL-STD-188-165A modem are not often considered. One issue is the need to up-sample these slower standards by factors...
The wideband global SATCOM (WGS) system is currently operational in the Pacific Ocean using WGS1 (175E). GBS traffic is supported in that theater today using the digital video broadcast by satellite (DVB-S) and operates using terminals originally designed for operation using the UHF follow-on satellite (UFO8). These terminals can now operate over WGS1 and UFO8. GBS is planned to migrate to the joint...
Modern Unmanned Aerial Vehicles (UAVs) have the capability of carrying sensors that produce large amounts of data. A high speed wireless data link is required to transfer this data to other systems for processing. This paper presents an FPGA-based implementation of a high data-rate (350 Mbps) QPSK modulator and demodulator to support a high data rate relay from a UAV to a ground station. By using...
With the continuing launch of the wideband global satellite communications (WGS) constellation, the Department of Defense (DoD) will have the opportunity to transition many existing military satellite communications networks from commercial satellite bandwidth to the military-owned satellite resources. Transition to WGS will provide the warfighter with additional capacity to augment future satellite...
Applications such as situational awareness are becoming more prevalent in highly dynamic tactical mesh networks and are placing high demand on existing RF network capacity. These applications require high aggregate data capacity but have some flexibility in packet by packet latency. Combined radio frequency and free space optical communication within a heavily scintillated atmospheric path behaves...
Multiband tactical communication modems must employ different waveforms to meet various demands in quality and nature of data. Range maximization, high data throughput and power conservation requirements are usually not fulfilled by a single waveform. To effectively deliver tactical multimedia data including coded audio, text, video, map and navigation information using radio, multiple choice of frequency...
Management of the devices in a Wideband SATCOM enterprise Earth terminal facility (ETF) is currently fragmented among multiple systems, and some of these legacy systems provide only limited functionality. This paper describes the architecture of a consolidated system to manage the elements of an ETF. Such a system can offer a number of benefits. First, the ETF management system can provide a consolidated,...
Parallel efforts are underway in the frequency management and the radio and waveform design communities to support data communications over HF radio channels wider than conventional 3 kHz allocations. In this paper, we analyze the potential performance of such ??wideband?? HF data channels as a function of spectrum allocation, coding, channel characteristics, and waveform overhead.
In this paper, we investigate the packet transmission delay in a time varying satellite uplink. Specifically, we are interested in bounding the packet transmission delay within the terminal router for uplink traffic in a future satellite network. Previous work has provided delay bounds for wireline networks with a fixed transmission rate. However, these bounds do not apply to the time-varying satellite...
In spite of its proven advantage, realization of affordable multi-functional phased-arrays, combining multiple communication apertures, is hindered by size, weight, and power consumption (SWaP) and cost issues. Incremental improvements in both transmit and receive analog RF chains are being pursued. However, it is difficult to expect revolutionary advances in phased array SWaP using architectures...
In 2007, MIT Lincoln Laboratory began supporting the United States Air Force (USAF) MILSATCOM family of advanced beyond line of sight terminals increment 2 (FAB-T Inc 2) program. The Laboratory led the development and implementation of the Ka-band high data rate (Ka HDR) waveform for the transportation of airborne intelligence, surveillance, and reconnaissance (AISR) data from air assets to any number...
Future military satellite communication systems will feature time-division multiple access (TDMA) uplinks in which uplink resources will be granted on demand to each terminal by a centralized resource controller. Due to the time-shared nature of the uplink, a terminal will not be constantly transmitting. It will only transmit in its assigned timeslots so as not to cause interference to other terminal...
In February 2006, the Department of Defense (DoD) Chief Information Officer (CIO) issued a memorandum with the subject heading, ??Department of Defense Policy for Transmission of Internet Protocol Over DoD-Leased and DoD-Owned Transponded Satellite Communications Systems?? explaining the need to provide a single solution that supports direct interoperability between users, maximizes bandwidth-on-demand...
This paper considers the case for using a ??digital IF?? (intermediate format) as an alternative to conventional analog IF (intermediate frequency) for distributing satellite uplink and downlink signals within modern high-capacity military satellite communications Earth terminals. ??Digital IF?? is defined as a purely digital format enabled by digital I & Q (in-phase and quadrature) sampling for...
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