178
178
Aug 2, 2013
08/13
by
Laug, O. B.; Stenbakken, G. N.; Leedy, T. F.
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Topic: Radio--Transmitter-receivers--Testing.
200
200
Jul 6, 2010
07/10
by
LAVRUKHINA, A. K
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eye 200
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THE RESULTS ARE GIVEN FOR INVESTIGATIONS OF 25 METEORITES THAT HAVE FALLEN IN THE PAST 15 YEARS. THE ROLE OF METEOROIDS AS INTERPLANETARY SPACE PROBES IS EXPLAINED AND THE MANNER IN WHICH METEOROIDS HAVE PROVIDED THE BOUNDARY BETWEEN THE GALACTIC AND SOLAR MAGNETIC FIELDS IS DISCUSSED.
Topics: ATS, CONFERENCES, EDUCATION, BROADCASTING, GROUND SUPPORT EQUIPMENT, SCHEDULING, TRANSMITTER...
279
279
Jun 2, 2011
06/11
by
Jordan, Jeffrey D.; Watkins, A. Neal; Fleming, Gary A.; Leighty, Bradley D.; Schwartz, Richard J.; Ingram, JoAnne L.; Grinstead, Keith D., Jr.; Oglesby, Donald M.; Tyler, Charle
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This paper discusses recent developments in rapid technology assessment resulting from an active collaboration between researchers at the Air Force Research Laboratory (AFRL) at Wright Patterson Air Force Base (WPAFB) and the NASA Langley Research Center (LaRC). This program targets the unified development and deployment of global measurement technologies coupled with a virtual diagnostic interface to enable the comparative evaluation of experimental and computational results. Continuing...
Topics: MINE DETECTORS, TRANSMITTER RECEIVERS, WAVEFORMS, TRANSFER FUNCTIONS, PATENTS, QUADRATURES, MINES...
When Programmable Implantable Medication System (PIMS) is implanted in human body, it delivers precise programmed amounts of insulin over long periods of time. Mini-Med Technologies has been refining the Technologies since initial development at APL. The size of a hockey puck, and encased in titanium shell, PIMS holds about 2 1/2 teaspoons of insulin at a programmed basal rate. If a change in measured blood sugar level dictates a different dose, the patient can vary the amount of insulin...
Topics: NASA Technical Reports Server (NTRS), DOSAGE, IMPLANTATION, INSULIN, PATIENTS, TRANSMITTER...
419
419
May 30, 2011
05/11
by
Dutta, Prabir K
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Microporous materials include a large group of solids of varying chemical composition as well as porosity. These materials are characterized by channels and cavities of molecular dimensions. The framework structure is made up of interconnecting T-O-T' bonds, where T and T' can be Si, Al, P, Ga, Fe, Co, Zn, B and a host of other elements. Materials with Si-O-Al bonding in the framework are called zeolites and are extensively used in many applications. Ion-exchange properties of these materials...
Topics: GLOBAL POSITIONING SYSTEM, ALGORITHMS, POSITIONING, RANGEFINDING, TRANSMITTER RECEIVERS,...
195
195
Jun 21, 2010
06/10
by
Stivers, L. S., Jr
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eye 195
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No Abstract Available
Topics: INFORMATION DISSEMINATION, INFORMATION RETRIEVAL, INFORMATION SYSTEMS, MARKETING, PERSONNEL...
541
541
Jun 1, 2011
06/11
by
Pollmann, Eric
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eye 541
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The present treatise reports on theoretical investigations and test-stand measurements which were carried out in the BMW Flugmotoren GMbH in developing the hollow blade for exhaust gas turbines. As an introduction the temperature variation and the stress on a turbine blade for a gas temperature of 900 degrees and circumferential velocities of 600 meters per second are discussed. The assumptions onthe heat transfer coefficients at the blade profile are supported by tests on an electrically...
Topics: SOLID PROPELLANT ROCKET ENGINES, FIBER OPTICS, DATA ACQUISITION, PROPELLANT GRAINS, PRESSURE...
General Dynamics Decision Systems employees have played a role in supplying telemetry, tracking, and control (TT&C) and other communications systems to NASA and the U.S. Department of Defense for over 40 years. Providing integrated communication systems and subsystems for nearly all manned and unmanned U.S. space flights, the heritage of this Scottsdale, Arizona-based company includes S-band transceivers that enabled millions of Americans to see Neil Armstrong and hear his prophetic words...
Topics: NASA Technical Reports Server (NTRS), TRANSPONDERS, TRANSMITTER RECEIVERS, WIRELESS COMMUNICATION,...
This Part II of a two-part specification establishes the requirements for manufacture and acceptance of the IFF Transponder prime item, Receiver/Transmitter, Radio RT-1063B/APX-101(V).
Topics: DTIC Archive, TELEDYNE ELECTRONICS NEWBURY CA, *RADAR EQUIPMENT, *TRANSPONDERS, SPECIFICATIONS,...
Omni and NASA Test Operations at Stennis entered a Dual-Use Agreement to develop the FOTR-125, a 125 megabit-per-second fiber-optic transceiver that allows accurate digital recordings over a great distance. The transceiver s fiber-optic link can be as long as 25 kilometers. This makes it much longer than the standard coaxial link, which can be no longer than 50 meters.The FOTR-125 utilizes laser diode transmitter modules and integrated receivers for the optical interface. Two transmitters and...
Topics: NASA Technical Reports Server (NTRS), TRANSMITTER RECEIVERS, FIBER OPTICS, DATA ACQUISITION,...
In this period of performance, we have tested the RF front-end, and characterized gain, phase, and delay linearity over the bandwidth of the transceiver, for both transmit and receive chain. We have manufactured and tested the ADC board, it is now functional. We have extended the time offset estimation algorithm to multi-tap channels (excluding Doppler). We are designing a final demonstration using the synchronization transceiver and in-house radar- and high-precision GPS hardware.
Topics: DTIC Archive, INTELLIGENT AUTOMATION INC ROCKVILLE MD, *TRANSMITTER RECEIVERS, *COHERENT RADAR,...
12
12
Nov 24, 2021
11/21
by
The United States
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GPO Item#: 0575 SuDoc#: AE 2.110:113-197 Description: An Act To promote the non-exclusive use of electronic labeling for devices licensed by the Federal Communications Commission. This Act may be cited as the "Enhance Labeling, Accessing, and Branding of Electronic Licenses Act of 2014" or the "E–LABEL Act". 128 STAT. 2055; PUBLIC LAW 113-197—NOV. 26, 2014. Shipping List: 2015-0131-p Shipped: 2/17/2015 Stamped: 3/2/2015 GPO...
Topics: Congress, Legislation, Radio, Labels, Transmitter-Receivers, Telecommunications, Federal...
In this period of performance, we are continuing to develop the hardware, and software for the final demonstration. 1.0 INTRODUCTION In this report we discuss progress in radar design, software design, and simulations 1.1 Hardware build up: All hardware has been received, and we are now integrating two Synchronization transceivers. 1.2 Simulations: In this period we are studying ranging using blind beamforming.
Topics: DTIC Archive, INTELLIGENT AUTOMATION INC ROCKVILLE MD, *COHERENT RADAR,...
In Multi-User MIMO networks, receivers decode multiple concurrent signals using Successive Interference Cancellation (SIC). With SIC a weak target signal can be deciphered in the presence of stronger interfering signals. However, this is only feasible if each strong interfering signal satisfies a signal-to-noiseplus- interference ratio (SINR) requirement. This necessitates the appropriate selection of a subset of links that can be concurrently active in each receiver's neighborhood; in other...
Topics: DTIC Archive, CALIFORNIA UNIV SAN DIEGO LA JOLLA, *THROUGHPUT, *DECODING, *TOPOLOGY, TRANSMITTER...
417
417
May 23, 2011
05/11
by
Cottone, Mary C
texts
eye 417
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Widespread coral bleaching (loss of pigments of symbiotic dinoflagellates), and the corresponding decline in coral reef health worldwide, mandates the monitoring of coral pigmentation. Samples of the corals Porites compressa and P. lobata were collected from a healthy reef at Puako, Hawaii, and chlorophyll (chl) a, peridinin, and Beta-carotene (Beta-car) were quantified using reverse-phase high performance liquid chromatography (HPLC). Detailed procedures are presented for the extraction of the...
Topics: RADIO ALTIMETERS, GREENLAND, TOPOGRAPHY, ICE, TRANSMITTER RECEIVERS, MALFUNCTIONS, HIGH RESOLUTION,...
394
394
Jun 21, 2010
06/10
by
Reichle, H. G., Jr
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eye 394
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Effects of argon, helium, nitrogen, and oxygen on absorption of infrared radiation by carbon dioxide
Topics: ENVIRONMENTAL RESEARCH SATELLITES, EXPERIMENT DESIGN, PERFORMANCE TESTS, TRANSPONDERS, GROUND...
After the recent success in jamming wireless improvised explosive devices (IEDs), the threat nowadays has shifted towards the use of buried command wires. A capability to immediately detect the presence of a command wire would be of great value to the troops on the ground. The major challenge of a command wire sensor is to detect the wire in clutter and achieve a high probability of detection without large number of false alarms. The objective of this thesis is to investigate the wire...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *IMPROVISED EXPLOSIVE DEVICES, *WIRELESS...
This presentation briefly discusses application of the Root Raised Cosine (RRC) pulse shaping in the space telecommunication. Use of the RRC filtering (i.e., pulse shaping) is adopted in commercial communications, such as cellular technology, and used extensively. However, its use in space communication is still relatively new. This will possibly change as the crowding of the frequency spectrum used in the space communication becomes a problem. The two conflicting requirements in...
Topics: NASA Technical Reports Server (NTRS), PULSE COMMUNICATION, SPACE COMMUNICATION, TELECOMMUNICATION,...
Increasing demand for higher data throughput coupled with limitations on available spectrum has motivated several efforts focused on the development of new higher efficiency waveforms for use in the challenging aeronautical telemetry environment. The OFDM waveform uses space, frequency and time diversity, as well as innovative signal processing techniques to achieve five times the spectral efficiency of legacy PCM/FM while maintaining a similar detection efficiency. There is a strong need for...
Topics: DTIC Archive, AIR FORCE TEST CENTER EDWARDS AFB CA, *FREQUENCY DIVISION MULTIPLEXING, POWER...
A Multiple-Input Multiple-Output (MIMO) transceiver provides extremely high spectral efficiencies by simultaneously transmitting multiple data streams in the same channel. Some research works have used MIMO technology to increase data rate or reduce energy consumption at communication links in wireless sensor networks. Since all layers of the protocol stack affect network performance, an efficient system should exploit the advantage of MIMO technology across all layers as well as the underlying...
Topics: DTIC Archive, TENNESSEE STATE UNIV NASHVILLE, *COMMUNICATIONS NETWORKS, RADIO LINKS, MULTICHANNEL...
A volume is scanned with a raster scan about a center of rotation using a transmitter/receiver at a selected range while gating a range window on the receiver with a selected range differential. The received signals are then demodulated to obtain signals representative of a property within the volume being scanned such as the density of a tumor. The range is varied until the entire volume has been scanned at all ranges to be displayed. An imaging display is synchronously scanned together with...
Topics: NASA Technical Reports Server (NTRS), RASTER SCANNING, TRANSMITTER RECEIVERS, PATENTS, Heyser,...
This document describes the design, construction, and testing of a proof-of-concept hardware and software package that combines cognitive radio and autonomous vehicles in a single system whose behavior captures the essential features of both. The result is a low-cost (less than $200) cognitive radio and cognitive engine package suitable for installation in the small experimental UAVs flown by USAFRL. Experiments with the package controlling a small wheeled vehicle demonstrate its ability to...
Topics: DTIC Archive, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG, *ADAPTIVE SYSTEMS, *AUTONOMOUS...
This paper presents the evaluation and analysis of two multi-band, transceiver architectures that address the current demands in telemetry applications. One architecture used image rejection to perform coarse band selection, translating the RF spectrum to IF frequencies, while the second architecture utilizes an adaptive filter bank architecture for more agile band selectivity. Both architectures consist of an analog front-end subsystem for signal conditioning and frequency translation, and a...
Topics: DTIC Archive, AIR FORCE TEST CENTER EDWARDS AFB CA, *RADIO TELEMETRY, ALGORITHMS, BANDWIDTH, PHASE...
150
150
Aug 2, 2013
08/13
by
Young, William F.; Remley, Kate A.; Ladbury, John M.; Holloway, Christopher L.; Grosvenor, Chriss A.; Koepke, Galen H.; Camell, D. G. (Dennis G.); Floris, Sander; Numan, Wouter; Garuti, Andrea.
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Topics: Radio waves--Attenuation--Measurement., Radio--Transmitter-receivers--Colorado--Boulder., Spectrum...
249
249
Jun 13, 2011
06/11
by
Bogard, Donald D.; Garrison, D. H.; Herzog, G. F.; Xue, S.; Klein, J.; Middleton, R
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eye 249
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Collisions probably occurred frequently in the early history of the asteroid belt. Their effects, which should be recorded in meteorites, must have included heating and melting along with shock alteration of mineral textures. Some non-chondritic meteorite types e.g., eucrites and IIE and IAB irons - do indeed give evidence of extensive impact heating more than 3.4 Gyr ago. The ordinary chondrites, in contrast, show little evidence of early impact heating. The Ar-Ar and Rb-Sr ages of ordinary...
Topics: SPACECRAFT COMMUNICATION, FREQUENCY SHIFT KEYING, TRANSMITTER RECEIVERS, RATES (PER TIME), MARS...
Phase II of a two-phase program to develop solid-state microwave transmit/receive modules has been partially completed. Modules fabricated to exacting mechanical and electrical specification have been received from two of three manufacturers and have been extensively evaluated using a highly sophisticated, computerized test facility at the Naval Research Laboratory. The modules could be interpreted as second-generation engineering models but with many design features of preproduction units. In...
Topics: DTIC Archive, Lavedan, Louis, NAVAL RESEARCH LAB WASHINGTON DC, *SOLID STATE ELECTRONICS,...
This report describes preliminary results of work done by JHU/APL under contract to the NASA Glenn Research Center to support flight testing of the Universal Access Transceiver (UAT) data link as a medium for weather data exchange. It presents a high level architectural description of the use of UAT to meet the program objectives with an identification of issues associated with the use of this data link, including a high level definition of the changes required to UAT avionics and ground-based...
Topics: NASA Technical Reports Server (NTRS), FLIGHT TESTS, DATA LINKS, WEATHER FORECASTING, TRANSMITTER...
285
285
May 27, 2011
05/11
by
Vanderslice, Joseph T.; Mason, Edward A.; Lippincott, Ellis R
texts
eye 285
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Potential-energy curves for nitrogen atom (N-N) interactions corresponding to the X (1)Sigma(sup , sub g), A (3)Sigma(sup , sub u), (5)Sigma(sup , sub g), (7)Sigma(sup , sub u), B (3) Pi(sub g), C (3)(Pi(su u)and a (1)Pi(sub g) states of the nitrogen molecule N2 as well as curves for the atom-molecules (N-N2) and molecule-molecule (N2-N2) interactions have been calculated. All calculations have been based as nearly as possible on experimental data, including spectroscopically determined...
Topics: AVIONICS, COST REDUCTION, NASA SPACE PROGRAMS, FIBER OPTICS, CHANNELS (DATA TRANSMISSION), EARTH...
Method and system for monitoring present location and/or present status of a target inventory item, where the inventory items are located on one or more inventory shelves or other inventory receptacles that communicate with an inventory base station through use of responders such as RFIDs. A user operates a hand held interrogation and display (lAD) module that communicates with, or is part of the base station to provide an initial inquiry. lnformation on location(s) of the larget invenlory item...
Topics: NASA Technical Reports Server (NTRS), INVENTORIES, RADIO FREQUENCIES, DETECTION, INTERROGATION,...
Topics: DTIC Archive, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *FACSIMILE EQUIPMENT, FOREIGN...
Topics: DTIC Archive, ADJUTANT GENERAL'S OFFICE (ARMY) WASHINGTON DC, *ARMY OPERATIONS, TELEPHONE SYSTEMS,...
A method and system for spatial data manipulation input and distribution via an adaptive wireless transceiver. The method and system include a wireless transceiver for automatically and adaptively controlling wireless transmissions using a Waveform-DNA method. The wireless transceiver can operate simultaneously over both the short and long distances. The wireless transceiver is automatically adaptive and wireless devices can send and receive wireless digital and analog data from various sources...
Topics: NASA Technical Reports Server (NTRS), ANALOG DATA, TRANSMITTER RECEIVERS, PATENTS, DEOXYRIBONUCLEIC...
A study approach to the problem of developing specifications for equipment for a radio backup to a landline fallout shelter communications system is described. Consideration is given those aspects of shelter program which contribute requirements for electrical performance of the equipments. Discussions are included concerning frequency availability and usage, cost analysis, state of the art, and recommendations. The report includes full specifications for three types of radio equipment. A radio...
Topics: DTIC Archive, GAUTNEY AND JONES COMMUNICATIONS INC WASHINGTON DC, *SHELTERS, *INTERCOMMUNICATION...
A transmitter/receiver module brassboard, a key portion of the overall volume scan Missile Attitude Measurement System (MAMS), designed under Contract F08635-75-C-0087, has been fabricated and tested. With the exception of two recommended circuit changes that are expected to improve the range resolution, the transmitter/receiver module design has been proven by this fabrication and testing program.
Topics: DTIC Archive, Colson, K K, TEXAS INSTRUMENTS INC DALLAS, *LASER TRACKING, ELECTROOPTICS, SOLID...
This proposed research seeks to identify, explain, and ultimately predict, the factors that significantly alter the operational effectiveness of underwater acoustic communications through experimental work and theoretical analysis. The long-term goal is to develop reliable, high rate transceivers customized for coherent underwater acoustic communications.
Topics: DTIC Archive, DELAWARE UNIV LEWES COLL OF MARINE STUDIES, *OCEAN ENVIRONMENTS, *UNDERWATER...
Forest Service officials consulted NASA and found a solution in the application of laser technology originally developed for satellites. NASA/Goddard built a system called a "laser range pole," a portable battery operated back-packed device that allows direct sightings no matter how rough the intervening terrain or how thick the forest. The equipment consists of a laser transmitter and a receiver. From a given property marker, the transmitter pulses a laser beam vertically, several...
Topics: NASA Technical Reports Server (NTRS), FORESTS, SURVEYS, TRANSMITTER RECEIVERS, LASER APPLICATIONS,...
199
199
Jun 1, 2011
06/11
by
Tan, Choon-Soo
texts
eye 199
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A framework for an effective computational methodology for characterizing the stability and the impact of distortion in high-speed multi-stage compressor is being developed. The methodology consists of using a few isolated-blade row Navier-Stokes solutions for each blade row to construct a body force database. The purpose of the body force database is to replace each blade row in a multi-stage compressor by a body force distribution to produce same pressure rise and flow turning. To do this,...
Topics: MICROWAVE INTERFEROMETERS, TRANSMITTER RECEIVERS, AMPLITUDE MODULATION, ELECTRON DENSITY...
The TAXI Direct-to-Direct interface, in conjunction with the Disk Recording System (DRS) software developed by the SSC Boeing group, supplies a solution that provides higher integrity data that can be processed and made available to the customer with hours. The TAXI Direct-to-Direct interface is a special purpose interface solution developed by ISC for demultiplexing data from a Racal Storeplex (or equivalent) multichannel recorder onto one or more hard discs that reside in, and/or are...
Topics: NASA Technical Reports Server (NTRS), SYNCHRONISM, RECORDING, DEMULTIPLEXING, REAL TIME OPERATION,...
225
225
Jul 23, 2010
07/10
by
Askarian, G. A
texts
eye 225
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No Abstract Available
Topics: CRACK OPENING DISPLACEMENT, DYNAMIC LOADS, ULTRASONIC FLAW DETECTION, ULTRASONIC TESTS,...
241
241
Jun 18, 2010
06/10
by
Ippolito, L. J
texts
eye 241
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System requirements for re-entrant traveling wave tube frequency converter communications satellite transponder
Topics: COMMUNICATION SATELLITES, TRAVELING WAVE TUBE, FREQUENCY CONVERTERS, SATELLITE TRANSMISSION,...
l. ;523-0764553-00111MDAAB07-72-C-0179ECOM0179-1(*antenna components, coupling circuits), transmitter receivers, very high frequency*couplersThe report covers the initial progress on a program to develop an exploratory developmental model of a transceiver multicoupler in the 30- to 80-MHz frequency range. The theoretical development and analysis leading to a satisfactory design for the multicoupler is presented. Experimental laboratory data is presented to support the theoretical development....
Topics: DTIC Archive, Landt, Harvey L, COLLINS RADIO CO CEDAR RAPIDS IA, *ANTENNA COMPONENTS, TRANSMITTER...
The objectives of this study were: (1) to design a 400 Mbps optical transceiver terminal to operate from a high-altitude balloon-borne platform in order to permit the quantitative evaluation of a space-qualifiable optical communications system design, (2) to design an atmospheric propagation experiment to operate in conjunction with the terminal to measure the degrading effects of the atmosphere on the links, and (3) to design typical optical communications experiments for space-borne...
Topics: NASA Technical Reports Server (NTRS), OPTICAL COMMUNICATION, OPTICAL DATA PROCESSING, TRANSMITTER...
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174
May 31, 2011
05/11
by
Sturner, S. J.; Keohane, J. W.; Reimer, O
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In this paper we present analysis of X-ray spectra from the supernova remnant IC443 obtained using the PCA on RXTE. The spectra in the 3 - 20 keV band are well fit by a two-component model consisting of thermal and nonthermal components. We compare these results with recent results of other X-ray missions and discuss the need for a cut-off in the nonthermal spectrum. Recent Chandra and XMM-Newton observations suggest that much of the nonthermal emission from IC443 can be attributed to a pulsar...
Topics: MULTIBEAM ANTENNAS, INTEGRATED CIRCUITS, LOW COST, AMPLITUDES, PHASED ARRAYS, ANTENNA DESIGN,...
This report summarizes the research activities carried out in the Electromagnetics and Microwave Laboratory, Department of Electrical Engineering, Texas A&M University. The project was sponsored by the U.S. Army Research Office under contract No. DAAH04-96-1-0372. The topics of investigation included mode stability in spatial power combining, active antenna transceivers and system applications, self-mixing active antennas, and novel uniplanar components. This final report for the period...
Topics: DTIC Archive, Chang, Kai, TEXAS A AND M UNIV COLLEGE STATION DEPT OF ELECTRICAL ENGINEERING,...
This operator's guide describes the bias buoy electronics. The bias buoy electronics provides low-power HF and UHF communications from a submerged submarine. Radio equipment and antennas, contained in a floatable buoy, are remotely operated by an inboard control unit through a 1500-ft retractable cable. The system includes a four-channel HF transceiver, four-channel UHF transceiver, VLF preamplifier, wideband VLF/MF/HF amplifier, IFF transponder, buoy with antennas, winch/nest assembly, tow...
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC, *BUOYS, *UNDERWATER COMMUNICATIONS, PRINTED...
ARINC Research Corporation has completed Phase I of the Microelectronic Transceiver Development Program, performed under Contract N00123-68-C-2520 for the U.S. Navy Electronics Laboratory Center, San Diego, California. This effort was conducted under the technical direction of Code S-240, and consisted of the following tasks; (a) A complete evaluation of the equipment, materials, procedures, and general capability of the NELC Hybrid Microelectronics Laboratory; (b) Expansion of this capability...
Topics: DTIC Archive, Rosenberg,H, ARINC RESEARCH CORP SANTA ANA CALIF WESTERN DIV, *MICROELECTRONICS,...
This paper presents the tool chain, methodology, and initial results of a study to provide a thorough, objective, and quantitative analysis of the design alternatives for space Software Defined Radio (SDR) transceivers. The approach taken was to develop a set of models and tools for describing communications requirements, the algorithm resource requirements, the available hardware, and the alternative software architectures, and generate analysis data necessary to compare alternative designs....
Topics: NASA Technical Reports Server (NTRS), TRANSMITTER RECEIVERS, SOFTWARE DEVELOPMENT TOOLS, COMPUTER...
A two-way coherent inductive communications link between an external transceiver and an internal transceiver located in a biologically implanted programmable medical device. Digitally formatted command data and programming data is transmitted to the implanted medical device by frequency shift keying the inductive communications link. Internal transceiver is powered by the inductive field between internal and external transceivers. Digitally formatted data is transmitted to external transceiver...
Topics: NASA Technical Reports Server (NTRS), COMMUNICATION NETWORKS, DATA LINKS, TRANSMITTER RECEIVERS,...
Traditional command uplink receivers are very limited in performance capability, take a long time to acquire, cannot operate on both uplink bands (NASA & AFSCN), and only support low-rate communications. As a result, transceivers end up on many programs critical paths, even though they should be a standard purchased spacecraft subsystem. Also, many missions are impacted by the low effective uplink throughput. In order to tackle these challenges, a transceiver was developed that will provide...
Topics: NASA Technical Reports Server (NTRS), FIELD-PROGRAMMABLE GATE ARRAYS, SUPERHIGH FREQUENCIES,...
The focus of this presentation are the fixed-beam antenna subsystems exploited with relatively simple protocols/algorithms in mobile ad hoc networks. Multiple fixed-beam directional antennas at node: together give node omni-directional coverage in azimuth; separate transceiver for each beam; number of beams may differ for different nodes.
Topics: DTIC Archive, Noneaker, Dan, CLEMSON UNIV SC, *DIRECTIONAL ANTENNAS, *COMMUNICATIONS PROTOCOLS,...
