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  • 1
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    Interplanetary orbit determination (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: A general description of the Viking interplanetary orbit determination activity extending from launch to Mars encounter is given. The emphasis is on the technical fundamentals of the problem, basic strategies and data types used, quantitative results, and specific conclusions derived from the inflight experience. Special attention is given to the use of the spacecraft-based optical measurements and their first application as a principal navigational data type for an interplanetary mission. The optical-based orbit determination, in fact, was the primary contributor to the exceptional interplanetary navigation accuracy experienced by both Viking missions. The Viking application of optical orbit determination relied in large part on the technology developed and demonstrated by the Mariner 9 Optical Navigation Demonstration.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Viking Navigation; p 48-108
    Format: text
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  • 2
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    Interplanetary orbit determination (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The logistical aspects of orbit determination (OD) in the interplanetary phase of the Mariner Mars 1971 mission are described and the working arrangements for the OD personnel, both within the Navigation Team and with outside groups are given. Various types of data used in the OD process are presented along with sources of the data. Functional descriptions of the individual elements of the OD software and brief sketches of their modes of operation are provided.
    Keywords: SPACE SCIENCES
    Type: Its Mariner 9 Navigation; p 20-118
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  • 3
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    Defining a spacecraft-based navigation system (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Spacecraft based data processing stages to perform navigation during outer planet missions
    Keywords: NAVIGATION
    Type: ; ACE(
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  • 4
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    In-flight gyro drift rate calibration on the Viking Orbiters (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The drift rates of the attitude control gyros on the Viking Orbiters were calibrated several times in flight. The process by which these rates were estimated as functions of time is novel for a space flight project, although relatively standard estimation techniques were used. The process is described fully and the results obtained from the twelve Viking single-axis gyros are analyzed. Although the possibility was explored, no significantly repeatable function of drift rate vs time or temperature was discovered; the overall mean was found to predict drift rate with acceptable accuracy.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Journal of Guidance and Control; 1; Nov
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  • 5
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    Annihilation of angular momentum drift during spinning-up and thrusting maneuvers of rigid bodies (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A very simple, yet accurate, heuristic solution for the spiral path of the angular momentum vector during spin-up and spin-down maneuvers of rigid body spacecraft is presented. A two-burn scheme is proposed consisting of a burn, a coast, and a second burn of the spin thruster. The appropriate burn times are found by a transcendental equation similar to Kepler's equation. Numerical results verify the accuracy of the burn, coast, and burn times given by closed form expressions. The scheme can also be applied to the problem of axial thrusting during constant spin.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AAS PAPER 83-408
    Format: text
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  • 6
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    Quaternions for Galileo scan platform control (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The application of quaternions for the articulation control of the Galileo scan platform is presented in this paper. The purpose of selecting quaternions is to minimize onboard computation time and program size. Attention has been focused on performing inertial pointing while the spacecraft is in a dual spin configuration. Target quaternion and relative target quaternion are introduced and used to specify the target position of the scan platform for point-to-point absolute slews and mosaic relative slews, respectively. The pointing error of the platform is represented by an error quaternion which is converted into gimbal angular errors defining the attitude change. For path control, a moving target quaternion is generated; the corresponding tracking error quaternion and the related spacecraft motion compensation capability are also addressed. A sample slew case is used to demonstrate the implementation of these concepts.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AAS PAPER 83-321
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  • 7
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    Inertial attitude determination for a dual-spin planetary spacecraft (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Previously cited in issue 21, p. 3639, Accession no. A81-44132
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 6; 491-498
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  • 8
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    Mariner Mars 1971 optical navigation demonstration (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of using a combination of spacecraft-based optical data and earth-based Doppler data to perform near-real-time approach navigation was demonstrated by the Mariner Mars 71 Project. The important findings, conclusions, and recommendations are documented. A summary along with publications and papers giving additional details on the objectives of the demonstration are provided. Instrument calibration and performance as well as navigation and science results are reported.
    Keywords: NAVIGATION
    Type: NASA-CR-138453 , JPL-TM-33-683
    Format: application/pdf
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  • 9
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    A detailed analysis of Mariner nine TV navigation data. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mariner 9 data analysis showed a good performance of the Mars probe planetary approach navigation systems and a good agreement between measured and predicted probe-approach characteristics. It was found that all operations were completed on time and that the calibration of the instruments and the observation of a greater-than-planned number of stars resulted in a higher-than-expected measurement accuracy. The key instruments of the Mariner were TV cameras taking pictures of Phobos and Deimos against a background of stars, calibrated sun and star sensors, and a scan platform. The error models used for optical navigation system elements, the calibration of the scan platform and of the TV cameras, and the image detection and location techniques are discussed in detail.
    Keywords: SPACE VEHICLES
    Type: AIAA PAPER 72-866 , American Institute of Aeronautics and Astronautics, Guidance and Control Conference; Aug 14, 1972 - Aug 16, 1972; Stanford, CA
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  • 10
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    The determination of the interplanetary orbits of Vikings 1 and 2 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A description is presented of the navigation-related events of the Viking Mars mission. Orbit determination system fundamentals are discussed, taking into account the trajectory models, observation models, radio data models, range considerations, optical data models, filter models, the orbit determination process, critical orbit determination inputs, and orbit determination errors. Attention is also given to questions of orbit determination strategy, orbit determination results, optical measurements processing, aspects of approach orbit determination evaluation, and the orbit determination software system.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 77-71 , Aerospace Sciences Meeting; Jan 24, 1977 - Jan 26, 1977; Los Angeles, CA
    Format: text
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