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长春光学精密机械与物... [2]
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会议论文 [2]
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2012 [1]
2011 [1]
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内容类型:会议论文
专题:长春光学精密机械与物理研究所
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Improved method of target detection on optoelectronic hybrid joint transform correlator in cluttered scences (EI CONFERENCE)
会议论文
2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China
Qian Y.
;
Yang L.
;
Cheng X.
;
Hong X.
收藏
  |  
浏览/下载:14/0
  |  
提交时间:2013/03/25
A classical joint transform correlator (JTC) usually yields large correlation sidelobes as well as a large correlation peak width
strong zero-order peak
and low diffraction efficiency
which make the detection ability of JTC lower. To overcome these difficulties
firstly
a joint power spectrum (JPS) subtraction technique in Fourier plane was proposed
where reference image power spectrum and object image power spectrum are subtracted from the JPS before inverse Fourier-transform operation
it is obvious that the modified JPS removes the zero-order term. Secondly
a fringe-adjusted filter (FAF) was presented to suppress sidelobes and noises. The modified JPS is multiplied by a FAF before the inverse Fourier-transform operation to obtain the cross-correlation peak. Computer simulations demonstrated the improved method can obviously remove zero-order diffraction and effectively suppress the sidelobes and noises compared with classic JTC
and then improve the detection ability for JTC. Experimental results presented the sharp correlation peak and also confirmed the method effectiveness. (2012) Trans Tech Publications
Switzerland.
Design of stable image platform on airborne camera (EI CONFERENCE)
会议论文
2011 International Conference on Advanced Design and Manufacturing Engineering, ADME 2011, September 16, 2011 - September 18, 2011, Guangzhou, China
Qian Y.
;
Yang L.
;
Hu F.
;
Hong X.
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  |  
浏览/下载:11/0
  |  
提交时间:2013/03/25
Modulation transfer function resulting from random vibration was analyzed. To conclude that the effect of angular displacement was the major factor. Allowable MTF degradation was represented
and 34dB reduction was achieved at frequency of 100HZ. With the help of MSC.ADAMS simulation software
and convert allowable MTF degradation into stable system design parameters
simulated curve proves correct for isolator
which can guide perfect design for stabilization system. Based on the spatial mechanism and translational principle of parallelogram
and the irrotational displacement mechanism was tested by optical method
an irrotational displacement isolator was developed. It can meet the requirements of irrotational displacement and damp. An instance was given
coupled angle is less than 8?
it can satisfy the demand of aerial imaging. (2011) Trans Tech Publications.
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