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  • 1
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    The tracking system analytic calibration activity for Mariner Mars 1971: Its function and scope (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The functions of the Tracking System Analytic Calibration activity for Mariner Mars 1971 (MM'71), its objectives for this and future missions, and the support provided to the MM'71 Navigation Team during operations are described. Support functions encompass calibration of tracking data by estimating physical parameters whose uncertainties represent limitations to navigational accuracy, and detailed analysis of the tracking data to uncover and resolve any anomalies. Separate articles treat the activities and results of producing calibrations for the various error sources: Deep Space Station Locations, timing and polar motion, charged particles, and the troposphere. Two other articles are also included discussing the effects of the media error sources on orbit determination and the merits of the smoothing technique used for DRIVID.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: Tracking System Analytic Calibration Activities for the Mariner Mars 1971 Mission; p 1-12
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    NASA TECHNICAL REPORTS
  • 2
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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
    Format: text
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  • 3
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    Charged particles (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Calibrations compensating for the effects of charged particles in the ionosphere and in the interplanetary medium were applied to the Doppler tracking data acquired during Mariner 9 missions on a demonstration basis. The combined effects of the space plasma and the ionosphere were measured by a comparison of the range and Doppler observables (Differenced Range Versus Integrated Doppler (DRVID). Independent measurements of the ionospheric effects were obtained from polarimeter devices located at the Goldstone, California, tracking complex.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: Tracking System Analytic Calibration Activities for the Mariner Mars 1971 Mission; p 43-60
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  • 4
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    Range validation using Kalman filter techniques (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Range pseudo-residuals may be improved to the level required for data validation by a measurement updating process which utilizes Bierman's adaptation of the Kalman filter measurement updating algorithms together with process noise compensation to account for model errors. This algorithm involves combining the currently available range predictions and measurements to produce an updated range residual measurement whose accuracy is constrained by the range data quality and by the estimated error in the prediction. The algorithm is compact and fast, and is thus suitable for on-line applications in network control or at the station.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: The Deep Space Network, Vol. 39; p 109-118
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  • 5
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    Early results from a prototype VLBI clock monitoring system (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Four sets of experiments were conducted to measure the relative epoch offsets between atomic clocks in California, Australia, and Spain by means of very long baseline interferometry (VLBI). The experiments were conducted using an incomplete R & D VLBI system with a number of inherent limitations. The results indicate that the measurement objective of epoch offset to 10 nanoseconds will be met. Tables show the measured offset, the residual to fit, and the square root Allan variance. Graphs show the rate change and the rate reset.
    Keywords: PHYSICS (GENERAL)
    Type: NASA. Goddard Space Flight Center Proc. of the 11th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 585-598
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  • 6
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    Demonstration of remote clock monitoring by VLBI with three baseline closures (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The capability of very long baseline interferometry (VLBI) to monitor the stability of remotely located hydrogen maser frequency standards has been demonstrated by a series of experiments conducted between Deep Space Stations in Australia, Spain, and California. The measured stabilities of the clock systems, over approximately 10 day intervals, were 1 to 3 parts in 10 to the 13th power, with the instabilities due to the oscillators, the clock distribution systems, the receiving system delays, and the VLBI measurement error. Experiments were conducted independently using two different systems (BLOCK 0 and WBDAS). Later comparison shows agreement on the order of 1 part in 10 to the 13th power. Closure was demonstrated on three separate occasions to 33, 10, and 13 ns with an error uncertainty of + or - 42 ns. The results represent an important consistency check on VLBI measurements.
    Keywords: PHYSICS (GENERAL)
    Type: NASA. Goddard Space Flight Center Proc. of the 11th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 557-576
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  • 7
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    Short turn-around intercontinental clock synchronization using very-long-baseline interferometry (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: During the past year work was accomplished to bring into regular operation a VLBI system for making intercontinental clock comparisons with a turn around of a few days from the time of data taking. Earlier VLBI systems required several weeks to produce results. The present system, which is not yet complete, incorporates a number of refinements not available in earlier systems, such as dual frequency inosopheric delay cancellation and wider synthesized bandwidths with instrumental phase calibration.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Proc. of the 12th Ann. Precise Time and Time Interval Appl. and Planning Meeting; p 445-460
    Format: application/pdf
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  • 8
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    Adaptation of a software development methodology to the implementation of a large-scale data acquisition and control system (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A progress report is presented on a program to upgrade the existing NASA Deep Space Network in terms of a redesigned computer-controlled data acquisition system for channelling tracking, telemetry, and command data between a California-based control center and three signal processing centers in Australia, California, and Spain. The methodology for the improvements is oriented towards single subsystem development with consideration for a multi-system and multi-subsystem network of operational software. Details of the existing hardware configurations and data transmission links are provided. The program methodology includes data flow design, interface design and coordination, incremental capability availability, increased inter-subsystem developmental synthesis and testing, system and network level synthesis and testing, and system verification and validation. The software has been implemented thus far to a 65 percent completion level, and the methodology being used to effect the changes, which will permit enhanced tracking and communication with spacecraft, has been concluded to feature effective techniques.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 83-2412
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  • 9
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    The effects of major error sources on planetary spacecraft navigation accuracies (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preflight error statistics of earth based Doppler tracking for Mariner navigation concerning Mars 1971 and Venus-Mercury 1973 missions
    Keywords: NAVIGATION
    Type: AIAA PAPER 70-1077 , AMERICAN ASTRONAUTICAL SOCIETY AND AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, ASTRODYNAMICS CONFERENCE; Aug 19, 1970 - Aug 21, 1970; SANTA BARBARA, CA
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  • 10
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    Application of Kalman filtering to spacecraft range residual prediction (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: One function of the Deep Space Network is validation of the range data that they receive. In this paper we present an automated online sequential range predictor which shows promise of significantly reducing computational and manpower expenditures. The proposed algorithm, a U-D covariance factored Kalman filter, is demonstrated by processing a four-month record of Viking spacecraft data taken enroute to Mars.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Annual Pittsburgh Conference; Apr 21, 1977 - Apr 22, 1977; Pittsburgh, PA
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