YU Shu-hai, WANG Jian-li, DONG Lei, LIU Xin-yue. Field experiment data processing of Fourier telescopy based on all phase spectrum analysis[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2275-2282
YU Shu-hai, WANG Jian-li, DONG Lei, LIU Xin-yue. Field experiment data processing of Fourier telescopy based on all phase spectrum analysis[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2275-2282 DOI: 10.3788/OPE.20122010.2275.
Field experiment data processing of Fourier telescopy based on all phase spectrum analysis
To improve the imaging quality of a Fourier Telescopy(FT) and to implement the high-resolution imaging for moving targets
the data processing methods to inhibit the spectral leakage generated by the frequency shift error from an acousto-optic frequency shifter
the bias of an optical device and truncating signals were researched and how to calculate the signal frequency in real time was given. Firstly
an all phase spectrum analysis technology was used to process sampling signals of a static target and a search algorithm was taken to capture the maximum frequency value of each interferometric beam. Then
the actual frequencies of any two beams were calculated by an all phase time shift phase difference correcting spectrum method. Finally
the frequency deviation and demodulated target's Fourier information were obtained and the demodulation frequency of the non-whole point was estimated by the least square fitting. The results show that the Strehl ratio of reconstructed image by proposed method is increased by 3% as compared with that of traditional methods. Furthermore
the new method has a higher inhibiting ability for spectral leakage
better reconstructed image
and it can provide the reference for data processing of moving targets.
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references
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