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  • 1
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    Optimum transfer to Mars via Venus (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Thrust maneuver at Venus for optimum Earth-Mars rendezvous trajectory in flyby mission
    Keywords: SPACE SCIENCES
    Type: NASA-CR-69348 , RE-16
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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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
  • 3
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    Design, simulation and evaluation of advanced display concepts for the F-16 control configured vehicle (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Advanced display concepts to augment the tracking ability of the F-16 Control Configured Vehicle (CCV) were designed, simulated, and evaluated. A fixed-base simulator was modified to represent the F-16 CCV. An isometric sidearm control stick and two-axis CCV thumb button were installed in the cockpit. The forward cockpit CRT was programmed to present an external scene (numbered runway, horizon) and the designed Heads Up Display. The cockpit interior was modified to represent a fighter and the F-16 CCV dynamics and direct lift and side force modes were programmed. Compensatory displays were designed from man-machine considerations. Pilots evaluated the Heads up Display and compensatory displays during simulated descents in the presence of several levels of filtered, zero-mean winds gusts. During a descent from 2500 feet to the runway, the pilots tracked a point on the runway utilizing the basic F-16, F-16 CCV, and F-16 CCV with advanced displays. Substantial tracking improvements resulted utilizing the CCV modes, and the displays were found to even further enhance the tracking ability of the F-16 CCV.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Research Center 16th Ann. Conf. on Manual Control; p 424-438
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Navigation and guidance requirements for commercial VTOL operations (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The NASA Langley Research Center (LaRC) has undertaken a research program to develop the navigation, guidance, control, and flight management technology base needed by Government and industry in establishing systems design concepts and operating procedures for VTOL short-haul transportation systems in the 1980s time period. The VALT (VTOL Automatic Landing Technology) Program encompasses the investigation of operating systems and piloting techniques associated with VTOL operations under all-weather conditions from downtown vertiports; the definition of terminal air traffic and airspace requirements; and the development of avionics including navigation, guidance, controls, and displays for automated takeoff, cruise, and landing operations. The program includes requirements analyses, design studies, systems development, ground simulation, and flight validation efforts.
    Keywords: NAVIGATION
    Type: NASA-CR-132423 , ASI-TR-74-17
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A spiral guidance approach concept for commercial VTOL operations (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of an investigation of the guidance and navigation requirements for VTOL spiral descents in the presence of winds are reported. Models were developed to describe the spiral maneuver and candidate guidance laws were formulated and analyzed. An important element of the guidance scheme is a unique wind estimator which uses the perturbations in bank angle and heading to improve the knowledge of the winds. Finally, recommendations for additional research, including a flight program, were outlined to evaluate the spiral guidance concept.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-CR-132651 , ASI-TR-75-21
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Optimum VTOL flight paths under constraint (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Minimum fuel takeoff and landing paths for VTOL aircraft with constraints on state and control, determining optimal trajectories
    Keywords: AIRCRAFT
    Type: AIAA PAPER 70-550 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, ATMOSPHERIC FLIGHT MECHANICS CONFERENCE; May 13, 1970 - May 15, 1970; TULLAHOMA, TN
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Omega navigation for general aviation (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A 70-hour flight test evaluation of an Omega navigation system was performed using a Piper Cherokee 180, to determine the feasibility of Omega for worldwide general aviation navigation. Measurements were made of position accuracy, noise phenomena, and signal to noise ratio. It was found that Omega accuracy is essentially insensitive to local geography, but that there are isolated local interference phenomena associated with radio transmitters, although the strongest noise source observed was due to the onboard power source for the VHF comm/nav radio. An occurrence of lane jumps was observed when attempting to navigate with one weak station.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: AIAA PAPER 76-1987 , Guidance and Control Conference; Aug 16, 1976 - Aug 18, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Guidance logic for spiral approaches (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A spiral approach concept is proposed as a standard procedure for independent, commercial VTOL operations conducted in close proximity to CTOL operations. A guidance logic is developed for this VTOL application, although the results may be applicable to curved approaches by STOL or CTOL aircraft as well. The guidance concept attempts to maintain constant airspeed along a fixed radius nominal spiral. The presence of wind requires a continuous variation in bank angle and heading rate to remain on the desired path. Linear perturbation analysis is used to select satisfactory feedback gains for commanded bank angle, longitudinal acceleration and vertical speed. A wind estimator detects differences between the predicted and observed wind and uses the result to modify the nominal control. For 4-D guidance the nominal time must be computed as a function of turn angle, which requires the solution of an elliptic integral. Time-varying longitudinal accelerations are necessary for 4-D guidance when the observed wind differs from the predicted wind, or when wind shear is present. The logic and the linear feedback gains have been tested in a nonlinear simulation. Results have generally verified the performance predicted by linear analysis.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: AIAA PAPER 76-1959 , Guidance and Control Conference; Aug 16, 1976 - Aug 18, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A spiral guidance approach concept for all-weather VTOL operations (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A description is presented of the results of an investigation of the guidance and navigation requirements for VTOL spiral descents in the presence of winds. A spiral approach for all-weather operations for VTOL aircraft is discussed along with aspects of spiral approach guidance. Attention is given to the equations of motion, nominal spiral specification, the wind estimator, and the feedback guidance law. The performance of the spiral guidance algorithms is evaluated with the aid of a realistic example which was selected for the Kennedy International Airport in New York City.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: International Conference on the Future of Aircraft All-Weather Operations; Nov 23, 1976 - Nov 26, 1976; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Optimum mixing of inertial navigator and position fix data (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Optimum mixing of inertial navigator and position fix data
    Keywords: NAVIGATION
    Type: NASA-CR-86271 , RE-62
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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