HF Radio Communication Systems Design Assessment. Task 3.3f. Real-Time Adaptive Control and Processing PDF Download
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Author: D. W. Graham Publisher: ISBN: Category : Languages : en Pages : 61
Book Description
The emphasis in this Real-Time Adaptive Control and Processing task has been on automated frequency management, link connectivity control, channel evaluation, and data transmission adaptation for maximum throughput. The possibilities for a federated processing system were considered as adjunct to maximizing information throughput via the HF communications system. Control aspects for digitally interfaced transmission systems which might connect to the HF channel for further data transmission were not analyzed. The processing and control requirements for automated frequency management have been incorporated in the real-time adaptive control and processing technology analysis. The frequency management capabilities hypothesized have been modeled after the Army's evolving management concepts. A closed-loop concept of frequency management was assumed to be implemented by collecting data at the net station level and transmitting this information, when polled, to the NCS. The NCS would process this information and transmit statistical parameters to the Corps level. This data could be processed further and passed to the Theater Frequency Manager to substantiate Corps requests for different or additional frequencies. Meaningful numbers in terms of measured bit error rates, noise levels, multipath delay spread, and Doppler frequency spread can be used to improve subsequent predictions and frequency assignments.
Author: D. W. Graham Publisher: ISBN: Category : Languages : en Pages : 61
Book Description
The emphasis in this Real-Time Adaptive Control and Processing task has been on automated frequency management, link connectivity control, channel evaluation, and data transmission adaptation for maximum throughput. The possibilities for a federated processing system were considered as adjunct to maximizing information throughput via the HF communications system. Control aspects for digitally interfaced transmission systems which might connect to the HF channel for further data transmission were not analyzed. The processing and control requirements for automated frequency management have been incorporated in the real-time adaptive control and processing technology analysis. The frequency management capabilities hypothesized have been modeled after the Army's evolving management concepts. A closed-loop concept of frequency management was assumed to be implemented by collecting data at the net station level and transmitting this information, when polled, to the NCS. The NCS would process this information and transmit statistical parameters to the Corps level. This data could be processed further and passed to the Theater Frequency Manager to substantiate Corps requests for different or additional frequencies. Meaningful numbers in terms of measured bit error rates, noise levels, multipath delay spread, and Doppler frequency spread can be used to improve subsequent predictions and frequency assignments.
Author: R. E. Duff Publisher: ISBN: Category : Languages : en Pages : 150
Book Description
High frequency equipment and system design have been largely ignored by the U.S. Army during the past ten years. This was in anticipation of achieving sufficient and effective communication via use of other frequencies and media. It is now apparent that hf is a more viable and useful tool than previously thought and deserves a role in the U.S. Army's communications system. The problem of now reinstituting hf as an integral part of U.S. Army communications is approached in this CORADCOM study. To better understand the real life hf environment the study team set out to make assessments from several different viewpoints: the communications system, physical, propagation media, noise, EMI/EMC, ECM and the U.S. Army fielded units in Germany. From these assessments the team was able to characterize the hf system in terms of required features and capabilities: ECCM, Nuclear Survivability (for equipment and communications link), Automated and Adaptive, Multi-Type Traffic, Multi-Range, Deployable, Securable, Compatible and Automated Frequency Management.
Author: Steve Dougherty Publisher: ISBN: Category : Languages : en Pages : 107
Book Description
Although under perfect non-fading propagation conditions narrow-band FM may be the best modulation technique, HG is not an ideal medium and single sideband, which is only a few dB worse under ideal conditions, continued to be the modulation technique that offers the best performance in the least bandwidth. In addition, for reasons of interoperability with existing and other nation's equipment, radios procured through the early 1990's would have to have single sideband. Moderate amounts of amplitude clipping can offer significant improvements in perceived voice quality. Even stronger clipping or logarithmic amplitude compression combined with an amplitude indicating pilot tone can offer greatly enhanced voice performance under good conditions at the cost of poorer performance under marginal conditions. The continued use a analog voice at HF is suspect because of the requirement for security. Therefore, major investments of research and development funds and time in analog processing of voice for HF transmission can not be encouraged. A single-tone modem with waveforms designed in concert with the radio filters and using an adaptive filter to compensate for the HF path offers the highest efficiency potential for digital voice.
Author: Christoph Jan Bartodziej Publisher: Springer ISBN: 3658165022 Category : Business & Economics Languages : en Pages : 158
Book Description
Christoph Jan Bartodziej examines by means of an empirical study which potential Industry 4.0 technologies do have regarding end-to-end digital integration in production logistics based on their functions. According to the relevance of the concept Industry 4.0 and its early stage of implementation it is essential to clarify terminology, explain relations and identify drivers and challenges for an appropriate use of Industry 4.0 technologies. The results will constitute a profound basis to formulate recommendations for action for technology suppliers and technology users.
Author: S. J. Smith Publisher: ISBN: Category : Languages : en Pages : 73
Book Description
The frequency management approach recommended includes the following: (1) The selection and dissemination of primary and backup orderwire frequencies from the Corps level to all net control stations (NCS); (2) The selection, assignment, and dissemination of operational frequencies to each net; (3) The accommodation of frequency change requests from the NCS at the Corps level; (4) The transfer of control from the Corps to the Division (or separate Brigade) in contingencies; and (5) The maximization of data rate and refined (microscopic) channel selection capabilities at the individual link level. A physical link representation of the recommended frequency management system is given. Since all link configurations within the Corps region have distances less than 286 km, macroscopic frequency management of intended skywave propagation circuits is a simple processs using vertical incidence sounding (VIS).
Author: Publisher: ISBN: Category : Languages : en Pages : 70
Book Description
Ionospheric sounding may be divided into the two following general classes of operation: (a) true-path ionospheric sounding and (b) ionsopheric parameter probing. Ionospheric sounding is used for both HF communications and for basic research purposes. True-path ionospehric soundign is used solely for Hf communications, which contrasts with ionospheric parameter probing (or radar techniques) which providesa basis for ionospheric prediction besides supplementing basic research. HF communication sounding is, generally, a pre- link-establishment process for macroscopic frequency selection. True-path ionospheric soundign should be distinguished from communication channle evaluation (in-band evaluation) since in-band evaluation is a post-link- establishment process for determining the quality of a given circuit. Sounding equipment is usually separate from the communications equipment as is spectrum monitoring; however, j in-band channle evaluation hardware/software may be merged within the demodulation process as discussed. In the beginning, vertical incidence soundings were used to acquire data on which were based a frequency prediction sysem published in 1954 and which forms the basis of the current prediction system. Oblique soundigns were first used to test and improve the predictions and understanding of ionospheric propagation. Later, oblique sounding was proposed as a real-time aid to communications.
Author: William A. Sethares Publisher: Springer Science & Business Media ISBN: 1447141776 Category : Music Languages : en Pages : 346
Book Description
Tuning, Timbre, Spectrum, Scale focuses on perceptions of consonance and dissonance, and how these are dependent on timbre. This also relates to musical scale: certain timbres sound more consonant in some scales than others. Sensory consonance and the ability to measure it have important implications for the design of audio devices and for musical theory and analysis. Applications include methods of adapting sounds for arbitrary scales, ways to specify scales for nonharmonic sounds, and techniques of sound manipulation based on maximizing (or minimizing) consonance. Special consideration is given here to a new method of adaptive tuning that can automatically adjust the tuning of a piece based its timbral character so as to minimize dissonance. Audio examples illustrating the ideas presented are provided on an accompanying CD. This unique analysis of sound and scale will be of interest to physicists and engineers working in acoustics, as well as to musicians and psychologists.
Author: Mohammed Abu-Nimer Publisher: Walter de Gruyter GmbH & Co KG ISBN: 3110624621 Category : Religion Languages : en Pages : 236
Book Description
In the emerging fields of religious and interreligious peacebuilding, the question of monitoring and evaluation is a challenging, yet necessary process. The need to develop comprehensive yet fitting evaluation models for religious and interreligious peacebuilding is not only important for donor interests, but also critical as a means of documenting and learning for peacebuilders themselves. Theories and best practices in monitoring and evaluation have become prevalent in many fields, yet the amount of literature on evaluating intercultural and, especially, religious and interreligious projects remains scant in comparison. This volume offers a unique contribution that not only looks at several of the challenges and implications faced by religious and interreligious peacebuilders but also provides concrete examples of new models and tools for monitoring and evaluating religious and interreligious peacebuilding projects. In doing so, this volume serves as a tool and point of reference for individuals and organizations developing and implementing interreligious dialogue and peacebuilding projects.
Author: Thomas Armstrong Publisher: ASCD ISBN: 1416614834 Category : Education Languages : en Pages : 195
Book Description
This book by best-selling author Thomas Armstrong offers classroom strategies for ensuring the academic success of students in five special-needs categories: learning disabilities, attention deficit hyperactivity disorder, autism, intellectual disabilities, and emotional and behavioral disorders.
Author: D. W. Graham
Author: D. W. Graham
Author: R. E. Duff
Author: Steve Dougherty
Author: Christoph Jan Bartodziej
Author: S. J. Smith
Author: 
Author: William A. Sethares
Author: Mohammed Abu-Nimer
Author: Thomas Armstrong
Author: Kong Luen Heong