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长春光学精密机械与物... [2]
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会议论文 [2]
发表日期
2008 [2]
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发表日期:2008
专题:长春光学精密机械与物理研究所
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Correction method for detection of the frequencies of railway fsk signals (EI CONFERENCE)
会议论文
2008 9th International Conference on Signal Processing, ICSP 2008, October 26, 2008 - October 29, 2008, Beijing, China
Xuguang Y.
;
Yu J.
;
Xifeng Z.
;
Tiefu D.
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  |  
浏览/下载:57/0
  |  
提交时间:2013/03/25
In order to acquire the information of railway binary frequency-shift keying signals
which include upper/down side frequencies and base low-frequency with high-accuracy
a novel frequency detection algorithm for France UM-71 system is proposed. Combining fast Fourier transform with the ratio correction method
the carrier frequency and the base frequency are obtained. Furthermore
the hardware consumption has been decreased. And it possesses the advantage of simple algorithm and fast operation speed. Comparing with the detection of the base frequency
the upper/down side frequency of railway signal is more difficult. Based on spectrum analysis and the spectrum correction
a new method
which adopts the sliding window
is put forward in this paper. The absolute differences between the upper side frequencies and the down side frequencies obtained are regarded as the criterion for judgment. Then the set of data
in which the maximum absolute value is
is to be the result of the upper/down side frequency. Because the sliding window will go through every stage when the upper/down side frequency changes
therefore
it is not sensitive enough to the position of data which need to be transformed. Using the method mentioned above
the experiment results show that the accuracy requirement of the side frequency is satisfied well. 2008 IEEE.
Modeling diffractive optical elements in hybrid systems with the effect of the material dispersion (EI CONFERENCE)
会议论文
Current Developments in Lens Design and Optical Engineering IX, August 11, 2008 - August 12, 2008, San Diego, CA, United states
Zhang H.
;
Liu H.
;
Lu Z.
;
Zhang H.
;
Ni Z.
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浏览/下载:9/0
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提交时间:2013/03/25
The diffractive optical element (DOE) is always modeled as an ideal pure diffractive element which neglects the refractive dispersion of the element's material. In this paper
a new model of the diffractive optical element is proposed
in which the effect of the refractive dispersion of the DOE's material is considered. The new model is explained and compared with standard diffraction-order expansion with the help of a hybrid system example. The analytical results show that the new model has an important meaning for the exact analysis of the hybrid refractive-diffractive optical system. 2008 Copyright SPIE - The International Society for Optical Engineering.
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