Abstract
The gravity gradiometer is widely used in mineral prospecting, including in the exploration of mineral, oil and gas deposits. The mismatch of accelerometers adversely affects the measuring precision of rotating accelerometer-based gravity gradiometers. Several strategies have been investigated to address the imbalance of accelerometers in gradiometers. These strategies, however, complicate gradiometer structures because feedback loops and re-designed accelerometers are needed in these strategies. In this paper, we present a novel matching method, which is based on a new configuration of accelerometers in a gravity gradiometer. In the new configuration, an angle was introduced between the measurement direction of the accelerometer and the spin direction. With the introduced angle, accelerometers could measure the centrifugal acceleration generated by the rotating disc. Matching was realized by updating the scale factors of the accelerometers with the help of centrifugal acceleration. Further simulation computations showed that after adopting the new matching method, signal-to-noise ratio improved from −41 dB to 22 dB. Compared with other matching methods, our method is more flexible and costs less. The matching accuracy of this new method is similar to that of other methods. Our method provides a new idea for matching methods in gravity gradiometer measurement.
Highlights
Spatial variations in gravity are reflected by the gravity gradient tensor, which is the second-order spatial derivative of gravitational potential
The results showed that using the new method suppressed the influence of the mismatch of accelerometer scale factors on measurement
The performance of the new matching method is equivalent to the strategy of trimming bias voltage proposed by Tu et al [25]
Summary
Spatial variations in gravity are reflected by the gravity gradient tensor, which is the second-order spatial derivative of gravitational potential. The European Space Agency has proposed a space-borne gravity gradiometer concept based on cold-atom interferometers; the proposed gradiometer has a sensitivity of 3.5mE/ Hz [23,24] Among these gradiometers, FTG and FALCON are the only two measuring instruments that have passed the flight test and achieved acceptable sensitivity in the field surveys with high-resolution [25]. We proposed a new configuration of GGI to allow the accelerometers to directly measure centrifugal acceleration well, butbyisdisc unsuitable the rotating accelerometer-based because the structures and caused rotation.for. We us reduce the instability caused by the drift of time-varying scale factors and increase the proposed precision aofnew configuration of GGI to allow the accelerometers to directly measure centrifugal acceleration measurement.
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