Impacts of frequency-dependent instrument noise for next-generation gravimetric mission on determining temporal gravity field model

Zhou, Hao; Tang, Lu; Tan, Ding-Yin; Duan, Hui-Zong; Pail, Roland; Luo, Zhicai; Zhou, Zebing

doi:10.1007/s00190-023-01716-2

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…In this paper, we have designed a 70 g-TM accelerometer with minimum size and mass with improved resolution. The following three operating modes are obtained by changing the bias voltage V b : (1) V b = 0.5 V, the accelerometer resolution is up to 10 −12 m s −2 Hz −1/2 magnitude for satellite gravity gradient measurement; (2) V b = 2.5 V, the accelerometer provides a resolution of 10 −11 m s −2 Hz −1/2 for satellite tracking measurement [16]; (3) V b = 25 V, the accelerometer has 10 −10 m s −2 Hz −1/2 resolution and a large measurement range to satisfy the needs of other special experimental tests. The in-orbit performance of the 70 g-TM accelerometer was tested on the Tianqin-1 (TQ-1) satellite launched in 2019, and the measured residual acceleration is about 2.0 × 10 −11 m s −2 Hz −1/2 at 0.04 Hz.…”

Section: Introductionmentioning

confidence: 99%

An ultra-high sensitivity 70 g-TM electrostatic accelerometer for next generation satellite gravity measurement

Zhou,

Bai,

Cai

et al. 2023

Class. Quantum Grav.

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High-precision electrostatic accelerometer has been widely employed in gravity measurement satellites. Accelerometer can be designed for different resolutions and measurement ranges to adapt to different scientific missions. This paper presents an ultra-high sensitivity 70 g-TM electrostatic accelerometer, designed to achieve an adjustable resolution from 10−12 m/s2/Hz1/2 to 10−10 m/s2/Hz1/2 with an optimal resolution of 3.3 × 10−12 m/s2/Hz1/2. The in-orbit performance of the 70g-TM accelerometer was tested on the Tianqin-1 (TQ-1) satellite.

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Section: Introductionmentioning

confidence: 99%

An ultra-high sensitivity 70 g-TM electrostatic accelerometer for next generation satellite gravity measurement

Zhou,

Bai,

Cai

et al. 2023

Class. Quantum Grav.

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Tracking shallow and deep groundwater storage changes in North China Plain with improved fusion method and hybrid spectral analysis approach

Dai,

Zhou,

et al. 2024

Journal of Hydrology

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Assessment of the Added Value of the GOCE GPS Data on the GRACE Monthly Gravity Field Solutions

Guo,

Lian,

Sun

et al. 2024

Remote Sensing

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The time-varying gravity field models derived from the Gravity Recovery and Climate Experiment (GRACE) satellite mission suffer from pronounced longitudinal stripe errors in the spatial domain. A potential way to mitigate such errors is to combine GRACE data with observations from other sources. In this study, we investigate the impacts on GRACE monthly gravity field solutions of incorporating the GPS data collected by the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) mission. To that end, we produce GRACE/GOCE combined monthly gravity field solutions through combination on the normal equation level and compare them with the GRACE-only solutions, for which we have considered the state-of-the-art ITSG-Grace2018 solutions. Analysis in the spectral domain reveals that the combined solutions have a notably lower noise level beyond degree 30, with cumulative errors up to degree 96 being reduced by 31%. A comparison of the formal errors reveals that the addition of GOCE GPS data mainly improves (near-) sectorial coefficients and resonant orders, which cannot be well determined by GRACE alone. In the spatial domain, we also observe a significant reduction by at least 30% in the noise of recovered mass changes after incorporating the GOCE GPS data. Furthermore, the signal-to-noise ratios of mass changes over 180 large river basins were improved by 8–20% (dependent on the applied Gaussian filter radius). These results demonstrate that the GOCE GPS data can augment the GRACE monthly gravity field solutions and support a future GOCE-type mission for tracking more accurate time-varying gravity fields.

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Impacts of frequency-dependent instrument noise for next-generation gravimetric mission on determining temporal gravity field model

Cited by 3 publications

References 41 publications

An ultra-high sensitivity 70 g-TM electrostatic accelerometer for next generation satellite gravity measurement

An ultra-high sensitivity 70 g-TM electrostatic accelerometer for next generation satellite gravity measurement

Tracking shallow and deep groundwater storage changes in North China Plain with improved fusion method and hybrid spectral analysis approach

Assessment of the Added Value of the GOCE GPS Data on the GRACE Monthly Gravity Field Solutions

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