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Yaowu Shi
Jilin University

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Electromagnetic Vector Sensor array parameter estimation method Lanxiang Zhu; Yaowu Shi; Yiran Shi; Life Deng; Hongwei Shi
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 5: May 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

Joint estimation method for DOA and polarization parameters of single electromagnetic vector sensor is mostly concerned in radar signal processing now. This paper presents a new algorithm which uses the cyclostationary property of signal. It gets the estimation of DOA and polarization parameters from the noise subspace with minimum norm method. This method can reduce the estimate error of noise subspace vector. At the same time, it is immune to the additional stationary noise of any distribution and interference signals with different cyclic frequencies. Method has been tested by computer simulation and the test result is show in the paper. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2562
Class Variance Based Instruction function for Microscope Auto-focus Lifei Deng; Hongwei Shi; Yaowu Shi; Lanxiang Zhu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper proposes an auto-focus Instruction function. The function is derived from Ostu segmentation. It uses class variance of segmentation result to instruct auto-focus process. Compare with the exist functions, class variance function need a small calculation mount. It is immunity to jam coming from camera and other inspection. It responses in a wide object distance range. And the value changes in a large range. All this features make this function is most flexible for microscope real-time auto-focus process. This paper analyzes the function and compares it to some traditional function. All the data are based practical instrument. DOI : http://dx.doi.org/10.11591/telkomnika.v12i4.4784
Co-Authors Hongwei Shi Hongwei Shi Lanxiang Zhu Lanxiang Zhu Life Deng Lifei Deng Yiran Shi