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A Filterless Photonic Approach for DFS and AOA Measurement Using a Push-Pull DPol-MZM
We report a novel simple photonic approach for measuring the Doppler frequency shift (DFS) and the angle of arrival (AOA) of a microwave signal in a radar detection system. The echo signals combined with a reference signal are applied to a dual-polarization Mach-Zehnder modulator (DPol-MZM), and a l...
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Published in: | IEEE photonics technology letters 2022-01, Vol.34 (1), p.19-22 |
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description | We report a novel simple photonic approach for measuring the Doppler frequency shift (DFS) and the angle of arrival (AOA) of a microwave signal in a radar detection system. The echo signals combined with a reference signal are applied to a dual-polarization Mach-Zehnder modulator (DPol-MZM), and a low-frequency electrical signal is generated after beating between the two signals in a low-speed photodetector. The DFS without direction ambiguity can be calculated by the value of the low-frequency signal. A phase difference is introduced between two echo signals which are sent to two sub-MZMs of the DPol-MZM respectively. The AOA is determined by the peak power of the down-convert signals, and a simple calibration is used to remove the amplitude of the echo signals and the reference signal by switching the output polarization states of the system. Compared with previously reported works, the proposed method carries out a comprehensive and multifunction measurement system based on a filterless and simple structure. Experimental results demonstrate the DFS errors within ± 0.5 Hz for a 15 GHz echo signal with a frequency offset of ± 100 kHz, and AOA measurement errors are within ± 1° for a range of 16° - 82° |
doi_str_mv | 10.1109/LPT.2021.3132423 |
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The echo signals combined with a reference signal are applied to a dual-polarization Mach-Zehnder modulator (DPol-MZM), and a low-frequency electrical signal is generated after beating between the two signals in a low-speed photodetector. The DFS without direction ambiguity can be calculated by the value of the low-frequency signal. A phase difference is introduced between two echo signals which are sent to two sub-MZMs of the DPol-MZM respectively. The AOA is determined by the peak power of the down-convert signals, and a simple calibration is used to remove the amplitude of the echo signals and the reference signal by switching the output polarization states of the system. Compared with previously reported works, the proposed method carries out a comprehensive and multifunction measurement system based on a filterless and simple structure. Experimental results demonstrate the DFS errors within ± 0.5 Hz for a 15 GHz echo signal with a frequency offset of ± 100 kHz, and AOA measurement errors are within ± 1° for a range of 16° - 82°</description><identifier>ISSN: 1041-1135</identifier><identifier>EISSN: 1941-0174</identifier><identifier>DOI: 10.1109/LPT.2021.3132423</identifier><identifier>CODEN: IPTLEL</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Angle of arrival ; Doppler frequency shift ; Dual polarization radar ; Errors ; Frequency shift ; Low speed ; Mach-Zehnder interferometers ; Microwave filters ; Microwave measurement ; Microwave photonics ; Modulation ; Optical filters ; Optical modulation ; Optical polarization ; Photonics ; Polarization ; Radar detection ; Reference signals</subject><ispartof>IEEE photonics technology letters, 2022-01, Vol.34 (1), p.19-22</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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The echo signals combined with a reference signal are applied to a dual-polarization Mach-Zehnder modulator (DPol-MZM), and a low-frequency electrical signal is generated after beating between the two signals in a low-speed photodetector. The DFS without direction ambiguity can be calculated by the value of the low-frequency signal. A phase difference is introduced between two echo signals which are sent to two sub-MZMs of the DPol-MZM respectively. The AOA is determined by the peak power of the down-convert signals, and a simple calibration is used to remove the amplitude of the echo signals and the reference signal by switching the output polarization states of the system. Compared with previously reported works, the proposed method carries out a comprehensive and multifunction measurement system based on a filterless and simple structure. Experimental results demonstrate the DFS errors within ± 0.5 Hz for a 15 GHz echo signal with a frequency offset of ± 100 kHz, and AOA measurement errors are within ± 1° for a range of 16° - 82°</description><subject>Angle of arrival</subject><subject>Doppler frequency shift</subject><subject>Dual polarization radar</subject><subject>Errors</subject><subject>Frequency shift</subject><subject>Low speed</subject><subject>Mach-Zehnder interferometers</subject><subject>Microwave filters</subject><subject>Microwave measurement</subject><subject>Microwave photonics</subject><subject>Modulation</subject><subject>Optical filters</subject><subject>Optical modulation</subject><subject>Optical polarization</subject><subject>Photonics</subject><subject>Polarization</subject><subject>Radar detection</subject><subject>Reference signals</subject><issn>1041-1135</issn><issn>1941-0174</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNo9kL1PwzAUxC0EEqWwI7FYYk7x81fIGLUUkFo1Eu3CYjmuTVOlcbGTgf8eo1ZM74a7e6cfQvdAJgCkeFpU6wklFCYMGOWUXaARFBwyAjm_TJokDcDENbqJcU8IcMH4CG1KPG_a3obWxoirne991xhcHo_Ba7PDzgc8m39g3W1xuSrx0uo4BHuwXY83sem-sMbVEHdZNbQtnlW-zZafy1t05XQb7d35jtFm_rKevmWL1ev7tFxkhhbQZ5Q9yy2znAhap0GG2lxIYaikNa8dNyCckaagtTNEuK0WzuU1lzUpBNSWaTZGj6fetPZ7sLFXez-ELr1UVALlMqd5kVzk5DLBxxisU8fQHHT4UUDUHzyV4Kk_eOoML0UeTpHGWvtvLyRLWwn7BV2aaIY</recordid><startdate>20220101</startdate><enddate>20220101</enddate><creator>Cao, Xu Hua</creator><creator>Fan, Xiao Jie</creator><creator>Li, Guang Yi</creator><creator>Li, Ming</creator><creator>Zhu, Ning Hua</creator><creator>Li, Wei</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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The echo signals combined with a reference signal are applied to a dual-polarization Mach-Zehnder modulator (DPol-MZM), and a low-frequency electrical signal is generated after beating between the two signals in a low-speed photodetector. The DFS without direction ambiguity can be calculated by the value of the low-frequency signal. A phase difference is introduced between two echo signals which are sent to two sub-MZMs of the DPol-MZM respectively. The AOA is determined by the peak power of the down-convert signals, and a simple calibration is used to remove the amplitude of the echo signals and the reference signal by switching the output polarization states of the system. Compared with previously reported works, the proposed method carries out a comprehensive and multifunction measurement system based on a filterless and simple structure. 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subjects | Angle of arrival Doppler frequency shift Dual polarization radar Errors Frequency shift Low speed Mach-Zehnder interferometers Microwave filters Microwave measurement Microwave photonics Modulation Optical filters Optical modulation Optical polarization Photonics Polarization Radar detection Reference signals |
title | A Filterless Photonic Approach for DFS and AOA Measurement Using a Push-Pull DPol-MZM |
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