Cassini Orbit Determination Results January 2006 - End of Prime Mission

Antreasian, P. G.; Ardalan, Shadan; Bordi, J. J.; Criddle, Kevin; Ionasescu, Rodica; Jacobson, R. A.; Jones, Bryn; MacKenzie, R. A.; Parcher, Daniel W.; Pelletier, Frédéric; Roth, Duane; Thompson, Paul; Vaughan, Andrew T M

doi:10.2514/6.2008-6747

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…During the Cassini tour of the Saturnian system, daily tracking from the Deep Space Network (DSN) stations granted approximately six hours per day of range and range-rate data, allowing the flight operations team to navigate the spacecraft (Antreasian et al 2005(Antreasian et al , 2007(Antreasian et al , 2008Pelletier et al 2012;Bellerose et al 2016). The orbit of Cassini was dictated by a complex optimisation process aimed at maximising the number of encounters with the moons while limiting the propellant consumption.…”

Section: Point Out a Better Knowledgementioning

confidence: 99%

“…In our OD solution, using navigation reconstructions (Antreasian et al 2005(Antreasian et al , 2007(Antreasian et al , 2008Pelletier et al 2012;Bellerose et al 2016) as a priori information, we then solved for the spacecraft initial conditions, corrections to OTMs direction and amplitude, small forces ∆V components, RTG acceleration, a scale factor for SRP, and stochastic accelerations. The latter are used for compensating remaining mis-modellings in the spacecraft dynamics; in particular, constant accelerations to the level 10 -11 10 -10 10 -9 10 -8 10 -7…”

Section: Set-upmentioning

confidence: 99%

“…The orbits and point-mass gravity accelerations from the other solar system planets were computed using INPOP17a planetary ephemerides (Viswanathan et al 2017), while gravity interactions with the other satellites of Saturn were derived from Jet Propulsion Laboratory's (JPL) SAT389 (Jacobson 2016a) and SAT393 (Jacobson 2016b). For the ephemerides of Titan we used the solution provided by the navigation team (Antreasian et al 2005(Antreasian et al , 2007(Antreasian et al , 2008Pelletier et al 2012;Bellerose et al 2016). The reconstruction of Titan orbit by the navigation team is sufficiently accurate (Boone & Bellerose 2017) to obtain a good fit of the data (see Fig.…”

Section: -3mentioning

confidence: 99%

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Analysis of Cassini radio tracking data for the construction of INPOP19a: A new estimate of the Kuiper belt mass

Ruscio

Fienga

Durante

et al. 2020

A&A

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Context. Recent discoveries of new trans-Neptunian objects have greatly increased the attention by the scientific community to this relatively unknown region of the solar system. The current level of precision achieved in the description of planet orbits has transformed modern ephemerides in the most updated tools for studying the gravitational interactions between solar system bodies. In this context, the orbit of Saturn plays a primary role, especially thanks to Cassini tracking data collected during its 13-year mission around the ringed planet. Planetary ephemerides are currently mainly built using radio data, in particular with normal points derived from range and Doppler observables exchanged between ground stations and interplanetary probes. Aims. We present an analysis of Cassini navigation data aimed at producing new normal points based on the most updated knowledge of the Saturnian system developed throughout the whole mission. We provide additional points from radio science dedicated passes of Grand Finale orbits and Titan flybys. An updated version of the INPOP planetary ephemerides based upon these normal points is presented, along with a new estimate of the mass of trans-Neptunian object rings located in the 2:1 and 3:2 mean motion resonances with Neptune. Methods. We describe in detail the orbit determination process performed to construct the normal points and their associated uncertainties and how we process those points to produce a new planetary ephemeris. Results. From the analysis, we obtained 623 new normal points for Saturn with metre-level accuracy. The ephemeris INPOP19a, including this new dataset, provides an estimated mass for the trans-Neptunian object rings of (0.061 ± 0.001)M⊕.

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Section: Point Out a Better Knowledgementioning

confidence: 99%

Section: Set-upmentioning

confidence: 99%

Section: -3mentioning

confidence: 99%

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Analysis of Cassini radio tracking data for the construction of INPOP19a: A new estimate of the Kuiper belt mass

Ruscio

Fienga

Durante

et al. 2020

A&A

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“…The prelaunch OD covariance analyses conservatively assumed the landmark OpNav measurements to have filter weights, W, given by Equation (1), where S is the DTM accuracy, R is the GSD of the camera at the image epoch, and W min is a minimum threshold weight, which was assumed to be 1.0 px (Antreasian et al 2016). This assumption was based on former planetary navigation missions such as Cassini, which navigated using center-finding OpNav measurements (Antreasian et al 2005). Conservative rotational-frame and spin-rate errors were also assumed.…”

Section: Navigation Digital Terrain Model Requirementsmentioning

confidence: 99%

Stereophotoclinometry for OSIRIS-REx Spacecraft Navigation

Adam,

McCarthy,

Leonard

et al. 2023

Planet. Sci. J.

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We summarize a decade of effort by the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission team to build up the unique capabilities, processes, and procedures required to accomplish the unprecedented navigation performance required during proximity operations at asteroid (101955) Bennu. Stereophotoclinometry was a key technology used for digital terrain model (DTM) generation and landmark navigation, enabling estimation of spacecraft trajectories and Bennu’s geophysical parameters. We outline the concept of operations for OSIRIS-REx landmark navigation and the wide array of testing and verification efforts leading up to OSIRIS-REx’s arrival at Bennu. We relate the outcome of these efforts to the experiences during proximity operations. We discuss navigation and DTM performance during operations, including detailed lessons learned to carry forward for future missions.

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“…In addition to the data span, it also indicates which data were used during the OD process. Typically, Doppler data are weighted based on the rms of the pass and scaled around 3× to account for noise due to turbulent processes on various timescales (McElrath et al 2004;Antreasian et al 2005).…”

Section: Estimation Setupmentioning

confidence: 99%

Post-flight Evaluation of Lidar-based Digital Terrain Models for OSIRIS-REx Navigation at Bennu

Leonard¹,

Geeraert²,

McCarthy³

et al. 2023

Planet. Sci. J.

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The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft spent more than 2 yr characterizing near-Earth asteroid (101955) Bennu. The OSIRIS-REx Laser Altimeter (OLA) was responsible for producing the most accurate reconstruction of the asteroid’s surface—down to a global resolution of around 5 cm with a data precision of ±1.25 cm. However, the best-quality global OLA digital terrain model (DTM), version 21 (v21), was not available for navigation during proximity operations, nor was the utility of this model evaluated for processing images and altimeter data for navigation. The focus of this paper is the post-flight assessment of the final OLA v21 DTM, its performance for navigation-related analysis, and estimates of corrections needed for the DTM and measurement models. We created 15 cm resolution maplets for processing optical navigation (OpNav) data, and 5 cm resolution DTMs for processing altimeter data, to estimate a combined spacecraft trajectory over five phases of the mission. Our estimated corrections to the OLA instrument model produce altimeter data residuals with a precision of 7.12 cm (1σ; one standard deviation from the mean). The OpNav maplets produce image residuals at 0.2 px (1σ) and estimated landmark locations accurate to ±6 cm, outperforming DTM navigation-related performance requirements. Finally, our estimate of the global DTM scale is more precise and within 1.1σ of previously reported values. We find that a slight discrepancy persists between the image and altimeter data, with image data suggesting that the DTM is too small by 0.049%, but nevertheless is exceptional for navigation.

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Cassini Orbit Determination Results January 2006 - End of Prime Mission

Cited by 9 publications

References 6 publications

Analysis of Cassini radio tracking data for the construction of INPOP19a: A new estimate of the Kuiper belt mass

Analysis of Cassini radio tracking data for the construction of INPOP19a: A new estimate of the Kuiper belt mass

Stereophotoclinometry for OSIRIS-REx Spacecraft Navigation

Post-flight Evaluation of Lidar-based Digital Terrain Models for OSIRIS-REx Navigation at Bennu

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