NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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grow in capability with time <strong>and</strong> to transform from supporting robotic missions in the solar system to supporting human<br />
ventures to Mars, Jupiter, Jupiter’s moons, <strong>and</strong> beyond. The protocol-based networking capability seamlessly connects the<br />
backbone, access, inter-spacecraft <strong>and</strong> proximity network elements of the architectures employed in the infrastructure. In this<br />
paper, we present the summary of <strong>NASA</strong>’s near <strong>and</strong> long term needs <strong>and</strong> capability requirements that were gathered by<br />
participative methods. We describe an integrated architecture concept <strong>and</strong> model that will enable communications for<br />
evolutionary robotic <strong>and</strong> human science missions. We then define the communication nodes, their requirements, <strong>and</strong> various<br />
options to connect them.<br />
Author<br />
Robotics; Space Communication; Solar System; Manned Space Flight; <strong>NASA</strong> Space Programs; Architecture (Computers)<br />
20040073539 Naval Postgraduate School, Monterey, CA<br />
Analysis of the Effects of Phase Noise <strong>and</strong> Frequency Offset in Orthogonal Frequency Division Multiplexing (OFDM)<br />
Systems<br />
Erdogan, Ahmet Y.; Mar. 2004; 151 pp.; In English; Original contains color illustrations<br />
Report No.(s): AD-A422290; No Copyright; Avail: CASI; A08, Hardcopy<br />
Orthogonal frequency division multiplexing (OFDM) is being successfully used in numerous applications. It was chosen<br />
for IEEE 802.1 la wireless local area network (WLAN) st<strong>and</strong>ard, <strong>and</strong> it is being considered for the fourth-generation mobile<br />
communication systems. Along with its many attractive features, OFDM has some principal draw-backs. Sensitivity to<br />
frequency errors is the most dominant of these drawbacks. In this thesis, the frequency offset <strong>and</strong> phase noise effects on OFDM<br />
based communication systems are investigated under a variety of channel conditions covering both indoor <strong>and</strong> outdoor<br />
environments. The simulation performance results of the OFDM system for these channels are presented.<br />
DTIC<br />
Frequencies; Frequency Division Multiplexing<br />
20040073597 Space <strong>and</strong> Naval Warfare Systems Center, San Diego, CA<br />
Flying Plug: A Small UUV Designed for Submarine Data Connectivity<br />
Cowen, Steve; May 1997; 21 pp.; In English; Original contains color illustrations<br />
Report No.(s): AD-A422442; No Copyright; Avail: CASI; A03, Hardcopy<br />
In the context of an information-based society the ability to reliably retrieve, transfer <strong>and</strong> process large quantities of data<br />
in a timely fashion becomes a critical technology issue. In the context of integrating submarine offboard sensors <strong>and</strong> physically<br />
supporting data connectivity with terrestrial networks: reliable, high b<strong>and</strong>width communications ranks as an extremely<br />
difficult technical problem. Few operating environments place more limitations on the ability to transfer high b<strong>and</strong>width data<br />
than underwater. The conductive medium places strict limits upon RF propagation, visibility greatly restricts the bounds of<br />
optical transmission <strong>and</strong> noise, ray-bending <strong>and</strong> multipath dominate the acoustic environment. Data transfer rates are usually<br />
limited to at most a few kilobits per second unless a hard connection via a cable is established. But adverse logistics inherent<br />
with underwater cables <strong>and</strong> their associated infrastructure often renders a cabled system totally impractical from a technical<br />
or economic st<strong>and</strong>point.<br />
DTIC<br />
Satellite Communication; Submarines<br />
20040073599 Massachusetts Inst. of Tech., Lexington, MA<br />
The Relationship Between Detection Algorithms for Hyperspectral <strong>and</strong> Radar Applications<br />
Keshava, Nirmal; Kogon, Stephen M.; Manolakis, Dimitris; Mar. 14, 2001; 23 pp.; In English; Original contains color<br />
illustrations<br />
Report No.(s): AD-A422450; ASAP-2001; No Copyright; Avail: CASI; A03, Hardcopy<br />
No abstract available<br />
Adaptation; Algorithms; Countermeasures; Imagery; Radar Detection<br />
20040073742 Naval War Coll., Newport, RI<br />
Operational Maneuver from the Sea <strong>and</strong> Amphibious Comm<strong>and</strong> Relationships: Is It time for a Joint Force Amphibious<br />
Component Comm<strong>and</strong>er?<br />
Bennett, Michael L.; Feb. 9, 2004; 29 pp.; In English; Original contains color illustrations<br />
Report No.(s): AD-A422662; No Copyright; Avail: CASI; A03, Hardcopy<br />
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