Multiplicative Method for Reduction of Bias in Indirect Digital Measurement Result

Muravyov, Sergey V.; Zlygosteva, Galina V.; Borikov, Valeriy

doi:10.2478/v10178-011-0014-x

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…According to the theory of indirect measurement error [30][31][32][33], using the spherical coordinate calculation formula of the sound source S based on the X0Y, X0Z, and Y0Z planes, the measurement errors of r i , θ i , and ϕ i caused by the time-delay error σ τ are:…”

Section: Relationship Between Ranging and Direction-finding And Fusiomentioning

confidence: 99%

Sound Source Localization Fusion Algorithm and Performance Analysis of a Three-Plane Five-Element Microphone Array

Xing

Yang

2019

Applied Sciences

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To reduce the negative effect on sound source localization when the source is at an extreme angle and improve localization precision and stability, a theoretical model of a three-plane five-element microphone array is established, using time-delay values to judge the sound source’s quadrant position. Corresponding judgment criteria were proposed, solving the problem in which a single-plane array easily blurs the measured position. Based on sound source geometric localization, a formula for the sound source azimuth calculation of a single-plane five-element microphone array was derived. The sinusoids and cosines of two elevation angles based on two single-plane arrays were introduced into the sound source spherical coordinates as composite weighted coefficients, and a sound source localization fusion algorithm based on a three-plane five-element microphone array was proposed. The relationship between the time-delay estimation error, elevation angle, horizontal angle, and microphone array localization performance was discussed, and the precision and stability of ranging and direction finding were analyzed. The results show that the measurement precision of the distance from the sound source to the array center and the horizontal angle are improved one to threefold, and the measurement precision of the elevation angle is improved one to twofold. Although there is a small error, the overall performance of the sound source localization is stable, reflecting the advantages of the fusion algorithm.

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Section: Relationship Between Ranging and Direction-finding And Fusiomentioning

confidence: 99%

Sound Source Localization Fusion Algorithm and Performance Analysis of a Three-Plane Five-Element Microphone Array

Xing

Yang

2019

Applied Sciences

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“…Methods for measuring of the resistance (by Thompson' double bridge, magnetic comparator compensation technique, etc.) require a standard resistance and difficult to implement for shunts with resistance less than 0.1 Ohm [14][15][16][17][18][19][20]. This structural scheme allows realizing in LIA with the differential input four modes of operation:…”

Section: Procedures For Measuring the Transfer Ratio Of Shuntsmentioning

confidence: 99%

Measurement of the Current Transfer Function for Power Transducers of Current to Voltage

Baranov

Borikov

Tsimbalist

2015

AMM

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Transducers of current to voltage, such as current shunts are widely used in control systems for the mechanical engineering. The shunt is required to determine the value of its resistance on DC and AC currents to determine the transfer ratio error in the wide frequency band in process of verification or calibration. Well-known methods for resistance measuring (by Thompson' double bridge; magnetic comparator, compensation technique, etc.) require a commerce resistance and difficult to implement for shunts with resistance less than 0.1 Ohms. The paper describes a procedure for measuring the complex impedance of transfer ratio of current shunts in the frequency band using the lock-in amplifier with the differential input. The experimental results of the proposed procedure for coaxial shunt with nominal resistance at DC 750 uOhm and 160 uOhm are described.

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Multiplicative Method for Reduction of Bias in Indirect Digital Measurement Result

Cited by 2 publications

References 5 publications

Sound Source Localization Fusion Algorithm and Performance Analysis of a Three-Plane Five-Element Microphone Array

Sound Source Localization Fusion Algorithm and Performance Analysis of a Three-Plane Five-Element Microphone Array

Measurement of the Current Transfer Function for Power Transducers of Current to Voltage

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