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  • 1
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    Refractivity influence on DSS Doppler data (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Examination of deep space Doppler data for terrestrial media contamination
    Keywords: COMMUNICATIONS
    Type: THE DEEP SPACE NETWORK, VOL. 1 15 FEB. 1971; P 31-41
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  • 2
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    Post-landing tracking data analysis (1968)
    In:  CASI
    Details
    Publication Date: 2005-11-13
    Description: Surveyor 7 post-landing tracking data analysis, and determining selenocentric location of probe and geocentric locations of tracking stations
    Keywords: SPACE SCIENCES
    Type: SURVEYOR 7 MISSION REPT. PT. 2 - SCI. RESULTS 15 MAR. 1968; P 315-327
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  • 3
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    Corruption of radio metric Doppler due to solar plasma dynamics: S/X dual-frequency Doppler calibration for these effects (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Doppler data from Mariner 6, 7, 9, and 10 and Pioneer 10 and 11 were discussed and the rms noise level for various sun-earth-probe angles were shown. The noise levels of both S- and X-band Doppler data for sun-earth-probe angles smaller than 20 deg were observed to be orders of magnitude greater than nominal. Such solar plasma-related Doppler degradation reduced the Mariner 10-Mercury 11 encounter navigation accuracy by nearly a factor of 10. Furthermore, this degradation was shown to be indirectly related to plasma dynamics and not a direct measure of the dynamics.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 88-101
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  • 4
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    Calibration effects on orbit determination (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The effects of charged particle and tropospheric calibrations on the orbit determination (OD) process are analyzed. The calibration process consisted of correcting the Doppler observables for the media effects. Calibrated and uncalibrated Doppler data sets were used to obtain OD results for past missions as well as Mariner Mars 1971. Comparisons of these Doppler reductions show the significance of the calibrations. For the MM'71 mission, the media calibrations proved themselves effective in diminishing the overall B-plane error and reducing the Doppler residual signatures.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: Tracking System Analytic Calibration Activities for the Mariner Mars 1971 Mission; p 83-96
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  • 5
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    A solar plasma stream measured by DRVID and dual-frequency range and Doppler radio metric data (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: S- and X-band DRVID, S- and X-band dual-frequency range (SX(p)), and Doppler (SX(p)) measured a 15-fold increase in the line-of-sight electron content of the solar plasma above the normal plasma background. A general increase in the plasma electron content continued for nearly 50 hours: it started about 12:00 (GMT) on 12 March 1976 and continued to grow until 17:00 (GMT) on 14 March. For the next 55 hours, between 17:00 (GMT) on 14 March to 00:54 (GMT) on 17 March, the plasma level diminished as the background level was approached. Not only were the temporal changes and absolute level of the plasma content measured but the measurements were also used to ascertain the mean-plasma-concentration location: it was estimated to be 4.1 light minutes from earth.
    Keywords: SOLAR PHYSICS
    Type: The Deep Space Network; p 43-54
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  • 6
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    Solar plasma: Viking 1975 interplanetary spacecraft dual-frequency Doppler data (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Viking 1975 interplanetary S- and X-band Doppler data are surveyed. These data show consistency with differenced range versus integrated Doppler (DRVID) data when there is solar plasma and with Faraday rotation data otherwise. An increase of solar plasma effects with decreasing sun-earth-probe (SEP) angle (approaching Mars orbit insertion) is demonstrated. The 2-way/3-way data indicate a homogeneous solar plasma structure over a 8,000-km spread. Occasional cycle slips in the data are pinpointed and tabulated.
    Keywords: SOLAR PHYSICS
    Type: The Deep Space Network; p 204-223
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  • 7
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    An evaluation of Galileo-Viking differenced range in Galileo-Mars flyby navigation (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A summary and evaluation of the Galileo-Mars flyby navigation techniques is presented. The navigational requirements of Galileo as it swings by Mars are going to be met with interferometric angular measurements (VLBI) and range and range-rate measurements. Like VLBI, dual spacecraft differenced range is less sensitive to Mars ephemeris errors and tracking station location errors than conventional range and Doppler. Similarly, differenced range provides angular information about the separation between the Mars Viking Lander I and the Galileo spacecraft. In covariance studies, dual spacecraft range coupled with conventional range and Doppler is shown to estimate the Galileo-Mars flyby distance to better than 10 km which is comparable to the VLBI performance. For the Galileo-Mars flyby, dual spacecraft differenced range promise to be an excellent backup to VLBI if the Mars Viking Lander remains operational.
    Keywords: ASTRODYNAMICS
    Type: NASA. Goddard Space Flight Center Fifth Ann. Flight Mech.(Estimation Theory Symp.; 28 p
    Format: application/pdf
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  • 8
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    Conditioning of MVM '73 radio-tracking data (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An extensive effort was undertaken to edit Mariner 10 radiometric tracking data. Interactive computer graphics were used for the first time by an interplanetary mission to detect blunder points and spurious signatures in the data. Interactive graphics improved the former process time by a factor of 10 to 20, while increasing reliability. S/X dual Doppler data was used for the first time to calibrate charged particles in the tracking medium. Application of the charged particle calibrations decreased the orbit determination error for a short data arc following the 16 March 1974 maneuver by about 80%. A new model was developed to calibrate the earth's troposphere with seasonal adjustments. The new model has a 2% accuracy and is 5 times better than the old model.
    Keywords: NAVIGATION
    Type: AIAA PAPER 74-832 , Mechanics and Control of Flight Conference; Aug 05, 1974 - Aug 09, 1974; Anaheim, CA
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  • 9
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    Demonstration of new data types for use in interplanetary navigation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mariner 10 was the first mission which contained many elements of the advanced navigation system which will be used in the late 1970's and 1980's. Preliminary navigation demonstrated were conducted using S/X charged particle calibrations, simultaneous Doppler data, nearly simultaneous range data, and bright object/star imaging data. The results of these demonstrations are very encouraging and a navigation system based upon these data types should be an order of magnitude better than the current system.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 74-831 , American Institute of Aeronautics and Astronautics, Mechanics and Control of Flight Conference; Aug 05, 1974 - Aug 09, 1974; Anaheim, 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
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