Feasibility and systems definition study for Microwave Multi-Application Payload (MMAP)

Work completed on three Shuttle/Spacelab experiments is examined: the Adaptive Multibeam Phased Array Antenna (AMPA) Experiment, Electromagnetic Environment Experiment (EEE) and Millimeter Wave Communications Experiment (MWCE). Results included the definition of operating modes, sequence of operation, radii of operation about several ground stations, signal format, foot prints of typical orbits and preliminary definition of ground and user terminals. Conceptual hardware designs, Spacelab interfaces, data handling methods, experiment testing and verification studies were included. The MWCE-MOD I was defined conceptually for a steerable high gain antenna

An epistemic dimension space for musical devices

The analysis of digital music systems has traditionally been characterized by an approach that can be defined as phenomenological. The focus has been on the body and its relationship to the machine, often neglecting the system’s conceptual design. This paper brings into focus the epistemic features of digital systems, which implies emphasizing the cognitive, conceptual and music theoretical side of our musical instruments. An epistemic dimension space for the analysis of musical devices is proposed

Technology utilization in a non-urban region - A measurement of the impact of the Technology Use Studies Center Final report

Technology utilization in agricultural areas and measurement of impact of technology use studies cente

Definition of Throw-Away Detectors (TADs) and VLF antenna for the AMPS laboratory

A Throw Away Detector (TAD)/subsatellite to be used as an experiment platform for the test flights to map the EMI from the shuttle and during the AMPS science flights is defined. A range of instrument platforms of varying capabilities is examined with emphasis on the EMI test vehicle. The operational support requirements of TAD/subsatellites are determined. The throw away detector is envisioned as a simple instrument package for supporting specific experiments

The GPS-Linked Transponder - A Command, Telemetry, and Positioning System for Small Spacecraft

A proposed GPS-Linked Transponder (GLT) Command, Telemetry, and Positioning System is described that offers significant advantages over present systems. The new system would replace the standard coherent transponder and modify existing ground-based systems to provide the U.S. space industry with significantly smaller and lighter-weight flight systems in addition to simplified ground stations with reduced operating costs. The GLT comprises a NASA STDN/ DSN-compatible or AFSCN/SGLS-compatible command receiver/detector, a 20-Mbps-capable PCM/PSK telemetry transmitter with a selectable-rate FEC encoder and optional encryptor, and a dual-mode spacecraft positioning subsystem including a full GPS receiver/navigator and/or GPS trans digitizer. The GLT design is based on similar hardware developed by APL for SDlO. The system will recover high accuracy spacecraft position and time data-either in real time autonomously or in near-real time on the ground-using advanced GPS positioning techniques. A simplified command receiver option is also available when compatibility with existing standards is not required and improved capability is desired. In the transdigitizer-only mode, mass and size are reduced to nearly one-tenth of existing transponder systems. Other advantages include reduced complexity and significantly higher uplink and downlink data rate communications than presently supported. Five ground-station configurations are defined, each providing varying levels of spacecraft positioning accuracies to the user

Flocking: A framework for declarative music-making on the Web

(Abstract to follow

Design And Development Of A Secure Wireless System Using Frequency Hopping Spread Spectrum [TK5103.2. A148 2007 f rb].

Dalam penyelidikan ini, satu sistem tanpa wayar automasi untuk menghantar data yang bersertakan kod PN secara automatik kepada pihak berkuasa berkenaan telah dibangunkan. In this research, an automated wireless system that sends the data accompanied with PN code automatically to the concerned authorities has been developed

FOSS Compact Model Prototyping with Verilog-A Equation-Defined Devices (VAEDD)

Equation-Defined Device models (EDD) have become very popular for behavioural modelling of semiconductor and other non-linear devices. Two feature that makes them particularly attractive are their interactive nature and easy testing during the model development process. However, they are less suited for operation as production level models due to their slow simulation performance. This paper presents a new extension to the EDD that offers C++ model performance coupled with the convenience of EDD modelling. The extended form of the EDD is called a Verilog-A EDD or VAEDD for short. It has the same structure as the standard EDD but is built around compiled Verilog-A module code, which in turn is translated to C++ code and dynamically linked to the main body of the simulator code. Essentially a VAEDD is a tiny Verilog-A module with a standardised internal code structure. To demonstrate the interactive approach to compact model building with VAEDD components the design and testing of a high power SiC Schottky barrier diode is included in the main body of the text

Benefits from Funding the MSD Engineering List: A Fiscal Year 1999 Case Study

Every year the Air Force Material Command (AFMC) funds the MSD Engineering list. The projects on the list are submitted by the Air Logistic Centers in order to address problems with the maintainability or reliability of a reparable part. AFMC funds the projects to determine the root cause of the problem and find the best solution to fix the part. Since the MSD Engineering list is funded in order to improve maintainability and reliability, not as a cost savings initiative, the actual benefits gained from the funds spent on the MSD Engineering list have not been identified. This thesis uses the FY99 MSD Engineering list as a representative sample of all MSD Engineering lists to identify how much of the money spent on the projects actually results in a benefit to the Air Force. Additionally, this study attempts to determine if there are any factors that correlate with projects that benefit the Air Force, and any common factors in projects that did not benefit the Air Force. Finally, this project attempts to describe the types of benefit the Air Force receives from the MSD Engineering list

Conceptual design study for a teleoperator visual system, phase 2

An analysis of the concept for the hybrid stereo-monoscopic television visual system is reported. The visual concept is described along with the following subsystems: illumination, deployment/articulation, telecommunications, visual displays, and the controls and display station