基于非均匀周期采样的傅里叶望远镜时域信号采集方法

于树海; 王建立; 董磊; 刘欣悦; 王国聪

doi:10.3788/CO.20130603.0395

Volume 6 Issue 3

Jun. 2013

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Article Contents

Chinese Optics > 2013 > 6(3): 395-401.

YU Shu-hai, WANG Jian-li, DONG Lei, LIU Xin-yue, WANG Guo-cong. Time region signal collecting method of Fourier telescopy based on non-uniform periodically sampling[J]. Chinese Optics, 2013, 6(3): 395-401. doi: 10.3788/CO.20130603.0395

Citation:

YU Shu-hai, WANG Jian-li, DONG Lei, LIU Xin-yue, WANG Guo-cong. Time region signal collecting method of Fourier telescopy based on non-uniform periodically sampling[J]. Chinese Optics, 2013, 6(3): 395-401. doi: 10.3788/CO.20130603.0395

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Time region signal collecting method of Fourier telescopy based on non-uniform periodically sampling

doi: 10.3788/CO.20130603.0395

1.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 11 Jan 2013
Rev Recd Date: 13 Mar 2013
Publish Date: 10 Jun 2013

Abstract

Abstract

In order to clearly reconstruct targets in a dim and deep space under the condition of the Lower Signal to Noise(SNR), a new time domain signal acquisition method of Fourier Telescopy(FT) based on Non-uniform Periodic Sampling(NUPS) was proposed. The simulation experiments on the proposed method were performed and the reconstructed images by NUPS method and traditional uniform sample method were compared. With the NUPS method, 100 points were respectively collected at the sampling frequency 1 MHz and 5 MHz. Then the signals of two sequences were respectively fast Fourier transformed and the concern frequency information was averaged. With traditional uniform sampling methods, 200 points were collected at 1 MHz and 5 MHz sampling frequency and then demodulated average was developed. Compared results show that the Strehl ratio of reconstructed image with diffraction-limited image is enhanced 0.03 compared to the original method when SNR is 50, and the Strehl ratio is 0.531 1 that is improved 0.223 3 compared with uniform sampling when SNR is 20. Obviously, imaging quality is improved by the NUPS method under conditions of low SNRs, thus the laser power is reduced. The NUPS lays the technical foundation for the implementation of the FT engineering system.
- Fourier telescopey,
- non-uniform periodically sampling,
- low SNR,
- high-resolution imaging

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References

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