Calibration of channel group delay nonlinearity error applied in wide-band interferometry

被引：0
|
作者：
Zhao Q. [1 ]
Hou X. [1 ]
Jiao Y. [1 ]
机构：
[1] Department of Optical and Electronic Equipment, Equipment Academy, Beijing
来源：
| 1600年 / Chinese Institute of Electronics卷 / 39期
关键词：
Channel group delay; Cross-correlation; Nonlinear distortion; Phase calibration (PCAL); Third-order fit; Wide-band interferometry;
D O I：
10.3969/j.issn.1001-506X.2017.06.06
中图分类号：
学科分类号：
摘要：
The form of wide-band group delay is analyzed and Ka-band interferometry is taken as the background. For the problem of nonlinear distortion of channel group delay, a calibration method based on cross-correlation of phase calibration (PCAL) signals is proposed. Comb-spectrum and linear phase are key characteristics of PCAL, according to this, the phase-frequency characteristic curve of cross-correlation is obtained by extracting PCAL's phase, and then the channel group delay is calculated. For parabolic group delay, third-order nonlinear fitting is used to replace the traditional first-order linear fitting. Simulation results show that when the signal-to-noise ratio is -10 dB, the third-order fitting has a higher agreement with the original phase-frequency characteristic curve, the standard deviation accounts for 1/4 of the first-order fitting and the group delay result is closer to the true value. The validity of the algorithm is proved. © 2017, Editorial Office of Systems Engineering and Electronics. All right reserved.
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页码：1221 / 1226
页数：5
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