Lin Cai a,b,c, Zebing Zhou a,b,*, Fang Gao a,b, Jun Luo a,b
a Key Laboratory of Fundamental Physical Quantities Measurement of Ministry of Education, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
b Institute of Geophysics, Huazhong University of Science and Technology, Wuhan 430074, China
c Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Received 6 December 2012; received in revised form 2 April 2013; accepted 9 April 2013; Available online 17 April 2013
Abstract
The current lunar gravity field models are mostly concluded from lunar exploration programs either by observations of satellite orbit perturbations or by intersatellite ranging and ranging rate measurements between two low-orbiting spacecrafts. Especially, the measurements from the Gravity Recovery and Interior Laboratory (GRAIL) have been used to produce the Moon’s gravity field models with spatial resolutions up to spherical harmonic degree 420 and 660 for the primary mission and extended mission, respectively. This paper presents a method using satellite gravity gradiometry, which not only can determine a moon’s gravity field model with a higher resolution, but also can obtain the medium and short wavelength components information with a higher accuracy. This advantage is still obvious in comparison with the results from GRAIL’s extended mission even though the maximum degree of the model derived from the mission is close to that achieved by the satellite gradiometry discussed in this study. Based on the simulations and analysis, a mission with the hypothesis of an orbit height of about 20 km, a mission duration of about 14 days, and a gradiometer accuracy level of about 30 mE/sqrt(Hz) is proposed, and it permits determination of a lunar gravity field model with a high accuracy of 14 mGal and a geoid with an accuracy of 20.5 cm, both at a spatial resolution of 7 km, corresponding to spherical harmonic degree and order 789. The effects of gravity gradient measurement errors, orbit height, tracking accuracy, mission duration and sampling rate are analytically investigated by the direct relationship between the satellite gravimetry measurements and coefficients of the Moon’s gravitational potential, which is verified by the least-squares method.
2013 COSPAR. Published by Elsevier Ltd. All rights reserved.
Keywords: Lunar exploration; Gradiometry; Error analysis; Gravity field
