Reconfigurable high-resolution photonic fractional Fourier transformer for broadband frequency measurement and large-scale chirp rate characterization of microwave signals
Reconfigurable high-resolution photonic fractional Fourier transformer for broadband frequency measurement and large-scale chirp rate characterization of microwave signals
复制标题
可重构高分辨率光子分数傅里叶变换器，用于微波信号的宽带频率测量和大规模线性调频速率表征
DOI：
10.1016/j.optcom.2019.125157
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发表时间：
2020-04
影响因子：
2.4
通讯作者：
Kang Xie
中科院分区：
文献类型：
--
作者：
Di Peng;Haiming Jiang;Fangcheng Shen;Hongyan Xia;Kang Xie
提出了一种可重构的光子分数傅立叶变换电路，实现了微波信号的高分辨率宽带频率测量和大范围线性调频特性表征。该方案基于三个具有共素数自由频谱范围(FSR)的并行移频环路(FSL)。通过改变每个FSL的频移和小的FSR，实现了可调的高分辨率分数傅里叶变换，并且该恢复算法保证了较大的频率和调频比测量范围。在数值验证中，采用频率分辨率为139.12 kHz、调频速率分辨率为0.3356 GHz/ms、频率分辨率为17.13 MHz、调频频率分辨率为17.21 MHz、调频速率分辨率为17.39 MHz的三个FSL，得到了频率分辨率为139.12 kHz、调频速率分辨率为0.3356 GHz/ms的无混叠频率测量范围和-4.35×105 GHz/μ~4.35×105 GHz/ms线性调频特性，无混叠频率测量范围达14.7404 GHz。通过在每个FSL中适当设置FSR，可以进一步提高频率和线性调频比的测量范围，从而在电子战中得到应用，实现微波信号的识别。
A reconfigurable photonic fractional Fourier transformer is proposed to realize broadband frequency measurement and large-scale chirp rate characterization of microwave signals with a high resolution. This scheme is based on three parallel frequency-shifting loops (FSLs) with co-prime free spectral range (FSR). Tunable high-resolution fractional Fourier transform is achieved through simply changing the frequency shift in each FSL with a small FSR, and large unambiguous frequency and chirp rate measurement range are guaranteed by the proposed recovery algorithm. In the numerical verification, non-aliasing frequency measurement range up to 14.7404 GHz and unambiguous chirp rate characterization range from-4.35× 10 5 to 4.35× 10 5 GHz/μ s are obtained by using three FSLs with FSRs of 17.13 MHz, 17.21 MHz and 17.39 MHz, where the frequency resolution and the chirp rate resolution are 139.12 kHz and 0.3356 GHz/ms, respectively. Through properly setting the FSR in each FSL, the frequency and chirp rate measurement range can be further improved, which can find application in electronic warfare to achieve microwave signal recognition.
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