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  • 1
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    A Kalman filter algorithm for terminal-area navigation with sensors of moderate accuracy (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Translational state estimation in terminal area operations, using a set of commonly available position, air data, nd acceleration sensors, is described. Kalman filtering is applied to obtain maximum estimation occuracy from the sensors but feasibility in real-time computations requires a variety of approximations and devices aimed at minimizing the required computation time with only negligible loss of accuracy. Accuracy behavior throughout the terminal area, its relation to sensor accuracy, its effect on trajectory tracking errors and control activity in an automatic flight control system, and its adequacy in terms of existing criteria for various terminal area operations are examined. The principal investigative tool is a simulation of the system. Previously announced in STAR as N83-29193
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 6; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Discovery of the Kalman filter as a practical tool for aerospace and industry (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The sequence of events which led the researchers at Ames Research Center to the early discovery of the Kalman filter shortly after its introduction into the literature is recounted. The scientific breakthroughs and reformulations that were necessary to transform Kalman's work into a useful tool for a specific aerospace application are described. The resulting extended Kalman filter, as it is now known, is often still referred to simply as the Kalman filter. As the filter's use gained in popularity in the scientific community, the problems of implementation on small spaceborne and airborne computers led to a square-root formulation of the filter to overcome numerical difficulties associated with computer word length. The work that led to this new formulation is also discussed, including the first airborne computer implementation and flight test. Since then the applications of the extended and square-root formulations of the Kalman filter have grown rapidly throughout the aerospace industry.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-TM-86847 , REPT-85424 , NAS 1.15:86847
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Navigation systems for approach and landing of VTOL aircraft (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The formulation and implementation of navigation systems used for research investigations in the V/STOLAND avionics system are described. The navigation systems prove position and velocity in a cartestian reference frame aligned with the runway. They use filtering techniques to combine the raw position data from navaids (e.g., TACAN, MLS) with data from onboard inertial sensors. The filtering techniques which use both complementary and Kalman filters, are described. The software for the navigation systems is also described.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-152335 , AMA-79-15
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development and evaluation of a Kalman-filter algorithm for terminal area navigation using sensors of moderate accuracy (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Translational state estimation in terminal area operations, using a set of commonly available position, air data, and acceleration sensors, is described. Kalman filtering is applied to obtain maximum estimation accuracy from the sensors but feasibility in real-time computations requires a variety of approximations and devices aimed at minimizing the required computation time with only negligible loss of accuracy. Accuracy behavior throughout the terminal area, its relation to sensor accuracy, its effect on trajectory tracking errors and control activity in an automatic flight control system, and its adequacy in terms of existing criteria for various terminal area operations are examined. The principal investigative tool is a simulation of the system.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-TP-2035 , A-8955 , NAS 1.60:2035
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Simulation, guidance and navigation of the B-737 for rollout and turnoff using MLS measurements (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simulation program is described for the B-737 aircraft in landing approach, a touchdown, rollout and turnoff for normal and CAT III weather conditions. Preliminary results indicate that microwave landing systems can be used in place of instrument landing systems landing aids and that a single magnetic cable can be used for automated rollout and turnoff. Recommendations are made for further refinement of the model and additional testing to finalize a set of guidance laws for rollout and turnoff.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-144959 , AMA-75-40
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Development and flight tests of a Kalman filter for navigation during terminal area and landing operations (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A Kalman filter for aircraft terminal area and landing navigation was implemented and flight tested in the NASA Ames STOLAND avionics computer onboard a Twin Otter aircraft. This system combines navaid measurements from TACAN, MODILS, air data, radar altimeter sensors along with measurements from strap-down accelerometer and attitude angle sensors. The flight test results demonstrate that the Kalman filter provides improved estimates of the aircraft position and velocity as compared with estimates from the more standard complementary filter. The onboard computer implementation requirements to achieve this improved performance are discussed.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-3015
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Automated landing, rollout, and turnoff using MLS and magnetic cable sensors (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A description of the simulation program used to study the landing approach, rollout and turnoff of the B737-100 aircraft utilizing MLS and a buried magnetic leader cable as navigation aids is presented. Simulation results are given and show the concept to be both feasible and practical for commercial type aircraft terminal area control.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-2907 , AMA-77-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    A study of redundancy management strategy for tetrad strap-down inertial systems (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Algorithms were developed that attempt to identify which sensor in a tetrad configuration has experienced a step failure. An algorithm is also described that provides a measure of the confidence with which the correct identification was made. Experimental results are presented from real-time tests conducted on a three-axis motion facility utilizing an ortho-skew tetrad strapdown inertial sensor package. The effects of prediction errors and of quantization on correct failure identification are discussed as well as an algorithm for detecting second failures through prediction.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-TM-78576 , A-6725
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    A Kalman filter for the Stoland system (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simple Kalman filter for potential use in STOL navigation systems is described. The mathematical formulation of all the elements of the filter, its initialization and overall operation are presented. Simulation results show that a typical approach flight to landing, the Kalman filter has much smaller errors during navigation on TACAN data and during transition from TACAN to MODILS data than a complementary filter. Summary type flow charts of the Kalman filter logic designed for the Sperry 1819A computer are presented. Also, the memory and real time requirements of the Kalman filter and complementary filter are described. The Kalman filter is shown to gain its superior performance at the expense of real time and memory required in the onboard computer.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-137668 , REPT-75-10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Guidance and flight control demonstration in a helicopter flight environment using a laser-gyro inertial navigation system (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present flight test program results indicate that an all-digital inertial sensing system can be used in helicopter flight guidance and control, provided that the rotor rotation-induced motions are filtered from body rate and accelerometer signals before they are used in the feedback control system. Attention is given to the problem posed by the different repetition rates used by each of the manufacturers involved in the procurement of such all-digital subsystems. Autopilot designers must accordingly predict the need for filters and install them where called for in the sensor software. Two alternatives to this method are explored. Recent technological developments indicate that strapped down inertial systems will replace vertical and direction gyros as well as body rate accelerometers in future aircraft systems.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: National Aerospace Meeting; Mar 24, 1982 - Mar 25, 1982; Moffett Field, CA
    Format: text
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    NASA TECHNICAL REPORTS
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