Engineering topics
Roman, J.
Publications and source records attributed to Roman, J..
Building a GPS Receiver for Space Lessons Learned
Over the past 4 years the Component Systems and Hardware branch at NASA GSFC has pursued an inhouse effort to build a unique space-flight GPS receiver. This effort has resulted in the Navigator GPS receiver. Navigator's first flight opportunity will come with the STS-125 HST-SM4 mission in August 2008. This paper covers the overall hardware design for the receiver and the difficulties encountered during the transition from the breadboard design to the final flight hardware design. Among the different lessons learned, the paper stresses the importance of selecting and verifying parts that are appropriate for space applications, as well as what happens when these parts are not accurately characterized by their datasheets. Additionally, the paper discusses what analysis needs to be performed when deciding system frequencies and filters. The presentation also covers how to prepare for thermal vacuum testing, and problems that may arise during vibration testing. It also contains what criteria should be considered when determining which portions of a design to create in-house, and which portions to license from a third party. Finally, the paper shows techniques which have proven to be extraordinarily helpful in debugging and analysis.
Millimeter-Wave Measurement of Frozen Hydrometeors during the 2003 Wakasa Bay Field Experiment
This study analyzes the millimeter-wave radiometric measurements of frozen hydrometeors during the field experiment that was held in Wakasa bay of Japan in January 29, 2003. The MM5 cloud simulation is employed to provide temperature and humidity profiles for the radiative transfer calculations.
Digital automatic data reduction techniques used in a 1000-flight biomedical study
Techniques developed to automatically process a large quantity of physiological data obtained during a 1000-flight study are described. To reduce this data reliably, a study program was conducted using physiological data from X-15 flights as a data source for experimenting with signal enhancement and noise elimination techniques. The techniques include an automatic means for counting heart rates, averaging electrocardiogram waveforms, plotting histograms of heart rate versus frequency, and counting respiration rates. These techniques were used to reduce more than 2000 hours of physiological data recorded in flight.
Hazards of the G-suit in lower extremity thrombophlebitis
G-suit hazards in lower extremity thrombophlebitis in pilots
A simple laboratory method for reduction of rhythm and rate in large-scale monitoring of electrocardiogram
Rapid reduction method of rhythm and rate information in large scale electrocardiogram monitoring
FM handling and analog-to-digital conversion of biomedical data from a 1,000-flight study
FM data handling facility for preparing analog physiological data obtained in flight for digital computations
Recording and signal-conditioning techniques and equipment used in a 1,000-flight biomedical study
Signal conditioning methods and equipment used for inflight recording of pilot biomedical data
A useful modification of the Wright spirometer
Spirometer modification to permit computer reduction of respiratory flow data
Development of respiration-rate transducers for aircraft environments
Development and evaluation of respiration rate transducers for aircraft environments
Flight research program. IX.
Cardiorespiratory functioning in flight monitored on carrier pilots in combat
Flight research program. VI.
Correlation between heart rate, landing error and field of view for binocular and monocular sphere of vision of jet pilots
Flight research program. VII.
Statistical analysis of heart rates of Navy carrier pilots during bombing attacks compared with those for launch and landing
Flight research program. V.
Mass spectrometer in physiological research or in medical monitoring
Flight research program. IV - A small gas analyzer for aerospace.
Miniaturized magnetic-type mass spectrometer for multigas analysis in high performance aircraft
Flight research program. III - High impedance electrode techniques.
High impedance electrode technique for large-scale flight physiological data collection, emphasizing skin preparation
The flight research program. i - long-range program to develop medical monitoring in flight.
Physiological parameter research and instrumentation development phases of long range program for in-flight monitoring in flight environment