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Drift mode accelerometry for spaceborne gravity measurements

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Abstract

A drift mode accelerometer is a precision instrument for spacecraft that overcomes much of the acceleration noise and readout dynamic range limitations of traditional electrostatic accelerometers. It has the potential of achieving acceleration noise performance similar to that of drag-free systems over a restricted frequency band without the need for external drag-free control or continuous spacecraft propulsion. Like traditional accelerometers, the drift mode accelerometer contains a high-density test mass surrounded by an electrode housing, which can control and sense all six degrees of freedom of the test mass. Unlike traditional accelerometers, the suspension system is operated with a low duty cycle so that the limiting suspension force noise only acts over brief, known time intervals, which can be neglected in the data analysis. The readout is performed using a laser interferometer which is immune to the dynamic range limitations of even the best voltage references typically used to determine the inertial acceleration of electrostatic accelerometers. The drift mode accelerometer is a novel offshoot of the like-named operational mode of the LISA Pathfinder spacecraft, in which its test mass suspension system is cycled on and off to estimate the acceleration noise associated with the front-end electronics. This paper presents the concept of a drift mode accelerometer, describes the operation of such a device, develops models for its performance with respect to non-drag-free satellite geodesy and gravitational wave missions, and discusses plans for testing the performance of a prototype sensor in the laboratory using torsion pendula.

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Acknowledgments

The author would like to thank Guido Müller and Giacomo Ciani at the University of Florida and William Weber at the University of Trento for their valuable insights related to this work. The author would also like to thank Anh Nguyen at the University of Florida for providing the low Earth orbit disturbance force model.

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  1. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA

    John W. Conklin

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  1. John W. Conklin
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Correspondence to John W. Conklin.

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Conklin, J.W. Drift mode accelerometry for spaceborne gravity measurements. J Geod 89, 1053–1070 (2015). https://doi.org/10.1007/s00190-015-0833-1

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  • DOI: https://doi.org/10.1007/s00190-015-0833-1

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