11 November 2014 A positioning algorithm based on super-resolution time delay estimation in dual Mach-Zehnder interferometry disturbance sensor
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Abstract
A novel positioning algorithm based on super-resolution time delay estimation in dual Mach-Zehnder interferometry disturbance sensor is employed. We first compute the twice correlation function of the two output signal of DMZI by using modified chirp z-transform. Then fine interpolation of correlation peak is adopted to compute waveform of the main correlation peak only using the main segment of the cross power spectrum to improve the resolution of the twice correlation function. At last, in order to enhance the capacity of peak detection, we calculate the difference between the correlation function and its Hilbert transform to sharpen the peak of the correlation function. We have experimentally demonstrated that the proposed positioning algorithm can improve the positioning resolution and accuracy, and it has the potential to accurate positioning in low sampling rate and reduce costs of the system.
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Qinnan Chen, Tiegen Liu, Kun Liu, Junfeng Jiang, Zhenyang Ding, Liang Pan, Chunyu Ma, Tianjiao Chai, Chang He, "A positioning algorithm based on super-resolution time delay estimation in dual Mach-Zehnder interferometry disturbance sensor", Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 92740U (11 November 2014); doi: 10.1117/12.2073398; https://doi.org/10.1117/12.2073398
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