Effect of  Bi4ti4o12  Contents on the Structural and Electrical Properties  of Lead-Free (1 −  X  ) Babi4ti4o15 – X Bi4ti3o12intergrowth Ceramics

Wang, Yuying; Zheng, Deyi; Mao, Runyu; Wu, Qiyun; Han, Wenbi; Wang, Xu

doi:10.2139/ssrn.4064420

Cited by 2 publications

(2 citation statements)

References 30 publications

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“…The flight path correction of high-speed autonomous unmanned aerial vehicle (HSA-UAV) is a key technology to improve the accuracy of precise navigation control, and the measurement of roll angle during the flight process of UAV is an important guarantee for achieving path correction. So far, the commonly used measurement elements for measuring the roll angle of high-speed flight carriers (HSFCs) are the combination of global navigation satellite system (GNSS) [1][2][3], MEMS inertial navigation systems [4][5][6] (MEMS-INSs), and geomagnetic sensors [7,8]. Among them, using geomagnetic sensors to measure the roll angle has the advantages of high reliability, low cost, no accumulated error, and passive autonomy, and can be used normally under satellite rejection conditions, it has been widely used in the field of navigation [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A novel method for measuring roll angle

Zhang,

Gao,

Wang

et al. 2024

Meas. Sci. Technol.

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The precise measurement of the spin speed of a high-speed autonomous unmanned aerial vehicle (HAS-UAV) is a key element in mastering flight stability, and the measurement of roll angle is the key to determining the accuracy of navigation control systems. We put forward a novel method for measuring roll angle. This method starts from the time-frequency domain analysis (TFDA) of the output signal of the geomagnetic sensor, extracts the time-frequency ridge of the time-frequency matrix (TFM) to obtain the spin speed of the HSA-UAV, and reconstructs the output signal of the geomagnetic sensor. It can calculate the roll angle when the calibration parameters of the geomagnetic sensor are unknown and have good engineering practical value. In addition, we also propose an improved nonlinear short-time Fourier transform (INLSTFT) with high-frequency resolution and a forward penalty dynamic path ridge-extraction method (FPDPRM) with frequency jump suppression to extract instantaneous frequency (IF) in the TFM.

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Section: Introductionmentioning

confidence: 99%

A novel method for measuring roll angle

Zhang,

Gao,

Wang

et al. 2024

Meas. Sci. Technol.

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“…The geomagnetic field has high stability, slow change, and moderate accuracy. MEMS inertial/geomagnetic integrated navigation has been applied to navigation in ships, submarines, cruise missiles, and other fields [10][11][12][13][14]. Relevant data show that in 2020, the geomagnetic navigation algorithm technology of the US Air Force has made a breakthrough, and the matching positioning accuracy can reach about 10 m; the MEMS/geomagnetic/satellite integrated navigation device researched by Yi Wenjun of Nanjing University of technology has achieved the navigation accuracy of the guided missile with the maximum standard deviation of attitude angular rate error of 1.7 • and the maximum standard deviation of attitude angular error of 2.6 • .…”

Section: Introductionmentioning

confidence: 99%

A drilling combination positioning method based on geomagnetic/inertial navigation combined with PSD improved unscented Kalman filtering algorithm*

Yang,

Qin,

Wei

et al. 2023

Meas. Sci. Technol.

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During the drilling process, the accuracy of measuring drilling tool attitude is severely affected by measurement drift errors in the inertial device itself and the significant interference noise generated by the impact vibration of the drill bit. To address these issues and achieve precise measurement of drilling trajectory, this paper proposes a combined positioning method based on geomagnetism/inertial navigation combined with PSD improved unscented Kalman filtering. An experimental platform was constructed, and a sensor system was installed in the vicinity of the drill bit for short section measurements. Experimental verification was conducted using actual drilling data. The results demonstrate that, compared to general unscented Kalman filtering, the average position error using PSD improved unscented Kalman filtering was reduced from 0.122 m to 0.088 m, and the average velocity error was reduced from 0.019 m s−1 to 0.005 m s−1. By comparing and matching with the drilling trajectory drawn in the logging process, the overall positioning accuracy of the combined positioning method is as high as 90.8%, yielding positioning results that are highly authentic and effective, thereby meeting the on-site usage requirements.

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Effect of Bi4ti4o12 Contents on the Structural and Electrical Properties of Lead-Free (1 − X ) Babi4ti4o15 – X Bi4ti3o12intergrowth Ceramics

Cited by 2 publications

References 30 publications

A novel method for measuring roll angle

A novel method for measuring roll angle

A drilling combination positioning method based on geomagnetic/inertial navigation combined with PSD improved unscented Kalman filtering algorithm*

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