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  • 1
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    Independent Navigation Team Contribution to New Horizons' Pluto System Flyby (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-20
    Description: The New Horizons spacecraft made it closest approach to Pluto on 14 July 2015. The most significant challenge of this mission was that the Pluto system ephemeris was initially known with a precision of ~1000 km. This needed to be improved significantly on approach in order to meet the science requirements. During the final six months leading to the flyby, a JPL Independent Navigation (INAV) Team was included in the ephemeris knowledge update process as a cross-check on the Project Navigation (PNAV) Team's results. This paper discusses the INAV team's experiences and challenges navigating New Horizons through the Pluto planetary system encounter.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: AAS 16-232 , JPL-CL-16-0473 , AAS/AIAA Space Flight Mechanics Meeting; Feb 14, 2016 - Feb 18, 2016; Napa, CA; United States
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  • 2
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    Initial Navigation Analysis for the Europa Multiple Flyby Mission Concept (2016)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Earth and spacecraft-based observations of the Jovian moon Europa have identified it as the most plausible habitat for extraterrestrial life in our solar system. Recently, NASA has formed a Europa Mission Concept to potentially explore this icy world with a sophisticated instrument suite operating from a spacecraft in orbit about Jupiter. Candidate trajectories have been designed that would use the Jovian moons to repeatedly bring the spacecraft near Europa, providing multiple observation opportunities over the mission duration. This paper describes navigation analyses associated with these trajectories that are being assessed for their operational feasibility. The analysis includes determination of the V requirements for the mission concept and notional spacecraft ephemeris knowledge capability.
    Keywords: Lunar and Planetary Science and Exploration
    Type: AAS 16-502 , JPL-CL-16-0488 , AAS/AIAA Space Flight Mechanics Meeting; Feb 14, 2016 - Feb 18, 2016; Napa, CA; United States
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  • 3
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    Cassini Navigation: The Road to Consistent Subkilometer Accuracy Satellite Encounters (2016)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper reviews the orbit determination performance for the last five years of the Cassini Mission Solstice Tour. During this period of time, Cassini had more than 30 satellite encounters, including Titan, Rhea, and Dione. We report on the navigational flyby accuracy, comparing post-flyby reconstructions and encounter predictions, and discuss the performance improvement and challenges over the years. Finally, we give an overview of the "Grand Finale" end of mission planned for 2017.The Cassini mission has been in orbit in the Saturnian system for more than 11 years, and hasreturned a wealth of discoveries and operational knowledge in the outer Solar System. In this paper, we reported on the last three years of navigation operations focusing on orbit determinationand encounter performance. Modeling and strategy changes over the past years now allow us tonavigate bodies at 100s of meters in accuracy, and consider a miss larger than 1 km an outlier.The Cassini Grand Finale will be spectacular - do not miss it!
    Keywords: Lunar and Planetary Science and Exploration
    Type: AAS 16-142 , JPL-CL-16-0432 , AAS Annual Guidance and Control Conference; Feb 05, 2016 - Feb 10, 2016; Breckinridge, CO; United States
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  • 4
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    Orbit Determination Sensitivity Analysis for the Planned Europa Multiple Flyby Mission (2016)
    In:  Other Sources
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    Publication Date: 2020-01-13
    Description: No abstract available
    Keywords: Lunar and Planetary Science and Exploration
    Type: JPL-CL-16-4185 , AIAA/AAS Astrodynamics Specialist Conference; Sep 12, 2016 - Sep 15, 2016; Long Beach, CA; United States
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  • 5
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    Resolution of Orbit Determination Prediction Instabilities at Titan During Cassini's Solstice Mission (2017)
    In:  Other Sources
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    Publication Date: 2019-08-06
    Description: The Cassini spacecraft has been in orbit about Saturn since 2004. Exploration of the Saturn system is driven by gravitational flybys of the moon Titan which alter the spacecraft trajectory. The Cassini Navigation Team receives regular updates to the Saturn satellites ephemeris from JPL's Solar System Dynamics group. The difference between subsequent ephemeris deliveries can be hundreds of meters in the position of Titan at the time of a flyby. Errors in Titan's position propagate downstream to the next flyby through the estimated spacecraft trajectory. Prior to 2013, the Cassini Orbit Determination Team estimated the Saturn satellite ephemeris parameters and used the a posteriori states and covariance of an operations arc as a priori inputs to subsequent estimation arcs. Since 2013, the OD Team has only been considering errors in the ephemeris and not estimating a correction to the satellite positions. The T119 Titan flyby exhibited a 3D miss distance of 2.44 km and the following T120 flyby yielded a smaller miss of 1.06 km at the 2.9s error level. These discrepancies between pre-flyby prediction and post-flyby trajectory reconstruction were due to errors in the Titan ephemeris. In order to improve the targeting of Titan in future flybys, the team restarted the satellite ephemeris estimation process for orbit determination solutions. Subsequent flybys had target misses of less than 1 km at the sub-3 error level. This paper describes the method of scaling the a priori satellite ephemeris covariance in the orbit determination process to allow larger corrections to the satellite system and improve the prediction of the spacecrafts Titan-relative position at the time of encounters.
    Keywords: Astrodynamics
    Type: JPL-CL-CL#17-1672 , International Symposium on Space Fight Dynamics; Jun 03, 2017 - Jun 09, 2017; Matsuyama; Japan
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  • 6
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    Initial Navigation Analysis for the Europa Multiple Flyby Mission Concept (2016)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Lunar and Planetary Science and Exploration
    Type: JPL-CL-16-0657 , AAS/AIAA Space Flight Mechanics Meeting; Feb 14, 2016 - Feb 18, 2016; Napa, CA; United States
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  • 7
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    Orbit Determination Sensitivity Analysis for the Europa Multiple Flyby Mission Concept (2016)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper details the results of parametric variations on the notional Europa Mission Concept tour navigation strategy on orbit determination delivery and knowledge errors and the associated statistical V consumption. Approach maneuver placement at encounter minus two and a half days and at encounter minus three and a half days is compared to the reference encounter minus three days location as well as variations to the data cutoff for approach maneuver design, which is baselined one day prior to maneuver execution. An execution error model with fixed and proportional components assigned to the magnitude and pointing directions is applied to each maneuver in a Monte Carlo simulation. Variations on the fixed and proportional contributions to both component errors are simulated and analyzed to show the effect of varying thruster characterization levels. The effects of varying levels of a priori satellite ephemeris errors are also characterized in this study.
    Keywords: Astrodynamics
    Type: JPL-CL-16-3748 , AIAA/AAS Astrodynamics Specialist Conference; Sep 13, 2016 - Sep 16, 2016; Long Beach, CA; United States
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