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  • 1
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    The P/POD project: Programmable/Pilot Oriented Display (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A pilot orientated display system was developed for general aviation aircraft in order to reduce cockpit workloads. Emphasis was placed on the optimization of flight procedural aspects (i.e., interpretation of Loran data). Low cost hardware/software were utilized in the system to reduce developmental costs. Parallel development and testing were conducted on the ground (simulator) and in the air using the same hardware.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Langley Research Center Joint Univ. Program for Air Transportation Res., 1980 p43-50 (SEE N81-21999 13-01)
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The P-POD Project (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The programmable pilot oriented display (P-POD), a multiprocessor based flight information processing and display unit, is discussed. Communication protocols between the three Z-80 processors inside P-POD are reviewed. The interface between the video processor, P2, and the main processor, P1, was tested. Hardware and software were revised. Data flow between P1 and P2 is illustrated. While running diagnostic routines to exercise the P1/P2 interface at maximum speed an intermittent failure was observed. A check of possible noise sources or race conditions in the hardware did not reveal the source of this failure. Possible software timing problems were also fully investigated. To eliminate the effects of this type of failure a performance monitor routine was used to detect these occasional failures and correct them. The data transmission cycle between P1/P2 is either allowed to continue normal operation or is re-initialized and restarted when an error is detected.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: NASA. Langley Research Center Joint Univ. Program for Air Transportation Res., 1981; p 31-37
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An analysis of the adaptability of Loran-C to air navigation (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The sources of position errors characteristics of the Loran-C navigation system were identified. Particular emphasis was given to their point on entry as well as their elimination. It is shown that the ratio of realized accuracy to theoretical accuracy of the Loran-C is highly receiver dependent.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA Langley Research Center Joint Univ. Program for Air Transportation Res., 1980 p19-42 (SEE N81-21999 13-01)
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Flight evaluation of Loran-C for general aviation area navigation (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper reports on a flight evaluation of Loran-C which was part of a long range study of area navigation systems for general aviation. Tests involved two different Loran-C receivers, 6 different aircraft, and a variety of antennas. Uncorrected position fixes were typically accurate to one quarter mile. With measured corrections, repeatability was good to within 200 ft. Signal reliability was 99.7%. The receiver was not sensitive to atmospheric noise. The time difference grid demonstrated a long term stability of 0.3 microsecond. Vertical whip and ADF E-field antennas were found suitable for airborne use. Loran-C was found satisfactory for instrument approaches to runways at general aviation airports where published latitude-longitude coordinates were available. Accuracy was further improved by using locally measured Loran-C time difference coordinates.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: Navigation; 28; Winter 1
    Format: text
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    NASA TECHNICAL REPORTS
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