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  • Other Sources  (12)
  • AIRCRAFT COMMUNICATIONS AND NAVIGATION  (8)
  • EARTH RESOURCES AND REMOTE SENSING  (3)
  • Communications and Radar  (1)
  • 1
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    Analysis of Thematic Mapper data for studying the suspended matter distribution in the coastal area of the German Bight (North Sea) (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Thematic Mapper data were analyzed with respect to its capability for mapping the complex structure and dynamics of suspended matter distribution in the coastal area of the German Bight (North Sea). Three independent pieces of information were found by factor analysis of all seven TM channels: suspended matter concentration, atmospheric scattering, and sea surface temperature. For the required atmospheric correction, the signal-to-noise ratios of Channels 5 and 7 have to be improved by averaging over 25 x 25 pixels, which also makes it possible to monitor the aerosol optical depth and aerosol type over cloud-free water surfaces. Near-surface suspended matter concentrations may be detected with an accuracy of factor less than 2 by using an algorithm derived from radiative transfer model calculation. The patchiness of suspended matter and its relation to underwater topography was analyzed with autocorrelation and cross-correlation.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment (ISSN 0034-4257); 28; 61-73
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Results of a Loran-C flight test using an absolute data reference (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A closed circuit flight test was conducted using VORs and NDBs as reference points. The Loran-C data collected during the flight was then compared against a reference provided by a discrete address beacon system facility. Information on the equipment configuration in the aircraft, the flight procedure, and the results obtained are presented.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA. Langley Research Center Joint Univ. Program for Air Transportation Res., 1980 p75-90 (SEE N81-21999 13-01)
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Small scale patches of suspended matter and phytoplankton in the Elbe River estuary, German Bight and tidal flats (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Landsat 5 TM measurements are found suitable for study of small scale features in coastal waters; three independent factors, namely suspended matter concentration, atmospheric scattering, and sea-surface temperature, were extracted from all seven TM channels on the basis of factor analysis. The distribution of suspended matter in near-surface water layer and sea surface temperature is observable with a spatial resolution of at least 120 x 120 sq m. The high correlation between water depth and suspended matter distribution established by ship-gathered data supports the presently hypothesized control by bottom topography and wind-modified tidal currents of eddy and front formation.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Advances in Space Research (ISSN 0273-1177); 9; 1, 19; 191-200
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Results of a Loran-C flight test using an absolute data reference (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A closed circuit flight test was conducted in the Boston area using VOR's and NDB's as reference points. The Loran-C data collected during the flight was then compared against a reference provided by the Discrete Address Beacon System (DABS) facility at Lincoln Laboratories. A MIT crew used a commercial receiver and recorded Loran-C time differences which would also be compared with the data provided by the DABS facility and eventually with the data collected by Ohio University. The Ohio University low-cost receiver was used for this test which was conducted in the Ohio University DC-3 flying laboratory. The Loran-C time-difference data was recorded with a microcomputer data collection system and stored on magnetic tape for subsequent analysis. The MIT receiver was also on board the DC-3, and recorded its data on a cassette tape which was later used by the MIT crew for data analysis. The equipment configuration in the aircraft, the flight procedure and the results obtained from the data collected with Ohio University's receiver and recording system are described.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-162751 , TM-74
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Data reduction software for LORAN-C flight test evaluation (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A set of programs designed to be run on an IBM 370/158 computer to read the recorded time differences from the tape produced by the LORAN data collection system, convert them to latitude/longitude and produce various plotting input files are described. The programs were written so they may be tailored easily to meet the demands of a particular data reduction job. The tape reader program is written in 370 assembler language and the remaining programs are written in standard IBM FORTRAN-IV language. The tape reader program is dependent upon the recording format used by the data collection system and on the I/O macros used at the computing facility. The other programs are generally device-independent, although the plotting routines are dependent upon the plotting method used. The data reduction programs convert the recorded data to a more readily usable form; convert the time difference (TD) numbers to latitude/longitude (lat/long), to format a printed listing of the TDs, lat/long, reference times, and other information derived from the data, and produce data files which may be used for subsequent plotting.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-162730 , TM-72
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Thematic mapper research in the earth sciences: Small scale patches of suspended matter and phytoplankton in the Elbe River Estuary, German Bight and Tidal Flats (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Thematic Mapper (TM) field experiment was followed by a data analysis to determine TM capabilities for analysis of suspended matter and phytoplankton. Factor analysis showed that suspended matter concentration, atmospheric scattering, and sea surface temperature can be retrieved as independent factors which determine the variation in the TM data over water areas. Spectral channels in the near infrared open the possibility of determining the Angstrom exponent better than for the coastal zone color scanner. The suspended matter distribution may then be calculated by the absolute radiance of channel 2 or 3 or the ratio of both. There is no indication of whether separation of chlorophyll is possible. The distribution of suspended matter and sea surface temperature can be observed with the expected fine structure. A good correlation between water depth and suspended matter distribution as found from ship data can now be analyzed for an entire area by the synoptic view of the TM scenes.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-182378 , NAS 1.26:182378
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A video display interface for the LORAN-C navigation receiver development system (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A microprocessor-based development system was designed and fabricated for prototype test of navigation receiver designs. During use of this system in the development of low-cost LORAN-C receiver/processor concepts, the limitations of the integral KIM-1 display were severely felt. It was to augment this numerical display that the video character display was produced. The circuit design presented meets the need for a flexible-format display capable of driving a small standard video monitor with only minimal demands upon microprocessor memory and MPU cycles.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-156934 , TM-58
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Results of the second flight test of the Loran-C receiver/data collection system (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The components of the Loran-C navigation system which were developed thus far are a phase-locked-loop receiver and a microcomputer development system. The microcomputer is being used as a means of testing and implementing software to handle sensor control and navigation calculations. Currently, the microcomputer is being used to collect and record data from the receiver in addition to development work. With these components, it was possible to record receiver data over a period of time and then reduce this data to obtain statistical information. It was particularly interesting to load the equipment developed in the laboratory into an aircraft and collect data while in flight. For initial flight tests, some important considerations were how well the entire system will perform in the field, signal strength levels while on the ground and in the air, the amount of noise present, changing of signal-to-noise ratio for various aircraft configurations and maneuvers, receiver overloading due to other equipment and antennas, and the overall usefulness of Loran-C as a navigation aid.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-158381 , TM-68
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Loran-C time difference calculations (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Some of the simpler mathematical equations which may be used in Loran-C navigation calculations were examined. A technique is presented to allow Loran-C time differences to be predicted at a location. This is useful for receiver performance work, and a tool for more complex calculations, such as position fixing.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-157957 , TM-63
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Initial flight test of a Loran-C receiver/data collection system (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Development of a low cost Loran C receiver for general aviation use is discussed. The preparation and procedure of a flight test conducted with a receiver design which utilizes a phase locked loop oscillator to track the Loran C signals is described. It is indicated that such a receiver is a viable alternative for future work in developing a low cost Loran-C navigator.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-157629 , TM-64
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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