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  • 1
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    IRAS sky survey atlas: Explanatory supplement (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This Explanatory Supplement accompanies the IRAS Sky Survey Atlas (ISSA) and the ISSA Reject Set. The first ISSA release in 1991 covers completely the high ecliptic latitude sky, absolute value of beta is greater than 50 deg, with some coverage down to the absolute value of beta approx. equal to 40 deg. The second ISSA release in 1992 covers ecliptic latitudes of 50 deg greater than the absolute value of beta greater than 20 deg, with some coverage down to the absolute value of beta approx. equal to 13 deg. The remaining fields covering latitudes within 20 deg of the ecliptic plane are of reduced quality compared to the rest of the ISSA fields and therefore are released as a separate IPAC product, the ISSA Reject Set. The reduced quality is due to contamination by zodiacal emission residuals. Special care should be taken when using the ISSA Reject images. In addition to information on the ISSA images, some information is provided in this Explanatory Supplement on the IRAS Zodiacal History File (ZOHF), Version 3.0, which was described in the December 1988 release memo. The data described in this Supplement are available at the National Space Science Data Center (NSSDC) at the Goddard Space Flight Center. The interested reader is referred to the NSSDC for access to the IRAS Sky Survey Atlas (ISSA).
    Keywords: ASTRONOMY
    Type: NASA-CR-197335 , JPL-PUBL-94-11 , NAS 1.26:197335
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Multisensor satellite data integration for sea surface wind speed and direction determination (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Techniques to integrate meteorological data from various satellite sensors to yield a global measure of sea surface wind speed and direction for input to the Navy's operational weather forecast models were investigated. The sensors were launched or will be launched, specifically the GOES visible and infrared imaging sensor, the Nimbus-7 SMMR, and the DMSP SSM/I instrument. An algorithm for the extrapolation to the sea surface of wind directions as derived from successive GOES cloud images was developed. This wind veering algorithm is relatively simple, accounts for the major physical variables, and seems to represent the best solution that can be found with existing data. An algorithm for the interpolation of the scattered observed data to a common geographical grid was implemented. The algorithm is based on a combination of inverse distance weighting and trend surface fitting, and is suited to combing wind data from disparate sources.
    Keywords: OCEANOGRAPHY
    Type: NASA-CR-174162 , NAS 1.26:174162
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Studies of uncontrolled air traffic patterns, phase 1 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The general aviation air traffic flow patterns at uncontrolled airports are investigated and analyzed and traffic pattern concepts are developed to minimize the midair collision hazard in uncontrolled airspace. An analytical approach to evaluate midair collision hazard probability as a function of traffic densities is established which is basically independent of path structure. Two methods of generating space-time interrelationships between terminal area aircraft are presented; one is a deterministic model to generate pseudorandom aircraft tracks, the other is a statistical model in preliminary form. Some hazard measures are presented for selected traffic densities. It is concluded that the probability of encountering a hazard should be minimized independently of any other considerations and that the number of encounters involving visible-avoidable aircraft should be maximized at the expense of encounters in other categories.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-141397 , RTI-43U-840
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of a microwave multilateration system for VTOL landing guidance (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An experimental microwave multilateration system has been developed by NASA to provide highly accurate position and velocity measurements during the approach and landing phase of VTOL aircraft. The system uses an angle modulated ranging signal to provide both range and range rate measurements between an aircraft transponder and multiple ground stations. Range and range rate measurements are converted to coordinate measurements, and the coordinate information is transmitted via an integral data link to the aircraft. This paper describes the development of the multilateration system and the associated digital signal processing techniques. Advantages and disadvantages of several processing techniques are discussed. The operation and accuracy of the system as determined from both analytical studies and flight experiments will be described.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: International Conference on Electronic Navigational Aid Systems for Aircraft; Nov 14, 1977 - Nov 18, 1977; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
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