A new method to determine the gravity field of small bodies from line-of-sight acceleration data

Jian, Nianchuan; Yan, Jianguo; Ping, Jinsong; Barriot, Jean‐Pierre; Rodriguez, J. A. P.

doi:10.1088/1674-4527/19/3/48

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…C.10 is about 10 −4 m/s 2 . Base on the concept of Appendix C we give an estimation of the mass and two order of gravity of Phobos [Jian et al, 2019].…”

Section: Line-of-sight Acceleration Observablesmentioning

confidence: 99%

“…Based on the concept of appendix E we gave an estimation of the mass and second-order coefficients of gravity of Phobos [58]. The line-of-sight acceleration observable (φ (2) ) directly reflects the kinematic state of the spacecraft (r 2 , ṙ2 , r2 ) and can be used to estimate the dynamic parameters relative to spacecraft (r 2 ) by employing a reference orbit.…”

Section: Line-of-sight Acceleration Observablesmentioning

confidence: 99%

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A GPU-based phase tracking method for planetary radio science applications

Jian¹,

Mikushin²,

Yan³

et al. 2020

Meas. Sci. Technol.

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This paper introduces a phase tracking method for planetary radio science research with computational algorithm implemented fo r NVIDIA GPUs. In contrast to the phase-locked loop (PPL) phase counting method used in traditional Doppler data processing, this method fits the tracking data signal into the shape expressed by the Taylor polynomial with optimal phase and amplitude coefficients. The Differential Evolution (DE) algorithm is employed for polynomial fitting. In order to cope with high computational intensity of the proposed phase tracking method, the graphics processing units (GPUs) are employed. As a result, the method estimates the instantaneous phase, frequency, derivative of frequency (line-of-sight acceleration) and the total count phase of different integration scales. This data can be further used in planetary radio science research to analyze the planetary occultation and gravitational fields. The method has been tested on MEX (Mars Express, ESA) and Chang'E 4 relay satellite (China) tracking data. In a real experiment with 400K data block size and ∼80,000 DE solver objective function evaluations we were able to acheive the target convergence threshold in 6.5 seconds and do real-time processing on NVIDIA GTX580 and 2× NVIDIA K80 GPUs, respectively. The precision of integral Doppler (60s) is 2 mrad/s and 4 mrad/s for MEX(3-way) and Chang'E 4 relay satellite(3-way) respectively.

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“…C.10 is about 10 −4 m/s 2 . Base on the concept of Appendix C we give an estimation of the mass and two order of gravity of Phobos [Jian et al, 2019].…”

Section: Line-of-sight Acceleration Observablesmentioning

confidence: 99%

Section: Line-of-sight Acceleration Observablesmentioning

confidence: 99%

A GPU-based phase tracking method for planetary radio science applications

Jian¹,

Mikushin²,

Yan³

et al. 2020

Meas. Sci. Technol.

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“…In addition, ancillary parameters such as solar radiation pressure coefficient can have an important influence for small bodies with a weak gravity field like 133P. A recent study has also proposed a method of estimating GM from line-of-sight accelerations (Jian et al 2019).…”

Section: Introductionmentioning

confidence: 99%

A simulation experiment on the GM estimation for Comet 133P/Elst-Pizarro

Gao

Yan

Jin

et al. 2021

Res. Astron. Astrophys.

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In China’s asteroid mission to be launched around 2025, (7968) 133P/Elst-Pizarro (hereafter 133P) will be the second target, after a visit to asteroid (469219) Kamo’oalewa. This paper describes a simulation of precise orbit determination for the spacecraft around comet 133P, as well as estimation of its gravitational parameter (GM) value and the solar radiation pressure coefficient Cr for the spacecraft. Different cometocentric distances of 200, 150 and 100 km orbits are considered, as well as two tracking modes: exclusive two-way range-rate mode (Earth station to spacecraft) and combinations of two-way range-rate and local spacecraft onboard ranging to the comet. Compared to exclusive two-way range-rate, the introduction of local ranging observables improves the final GM uncertainties by up to one order of magnitude. An ephemeris error in the orbit of 133P is also considered, and we show that, to obtain a reliable estimate of the GM for 133P, this error cannot exceed a one km range.

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A new method to determine the gravity field of small bodies from line-of-sight acceleration data

Cited by 2 publications

References 21 publications

A GPU-based phase tracking method for planetary radio science applications

A GPU-based phase tracking method for planetary radio science applications

A simulation experiment on the GM estimation for Comet 133P/Elst-Pizarro

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