A Simple Photonic System for DFS and AOA Simultaneous Measurement

Li, Xintong; Tao, Jinming; Li, Jinye; Jia, Qianqian; Wang, Chaoquan; Liu, Jianguo

doi:10.3390/photonics9120980

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…The phasemeter applies the principle of the digital phase-locked loop to measure the phase change of three beat-notes. However, due to the relative speed between spacecraft, when the laser travels from one spacecraft to another, the Doppler shift [ 6 , 7 ] will shift the frequencies of three beat-notes. Take the LISA as an example [ 1 , 2 , 7 ]: the frequency range can reach 9 MHz [ 3 ], resulting in unknown frequencies of three beat-notes.…”

Section: Introductionmentioning

confidence: 99%

Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection

Wang

Sui

et al. 2023

Sensors

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In space gravitational wave detection missions, the laser heterodyne interference signal (LHI signal) has a high-dynamic characteristic due to the Doppler shift. Therefore, the three beat-notes frequencies of the LHI signal are changeable and unknown. This may further lead to the unlocking of the digital phase-locked loop (DPLL). Traditionally, fast Fourier transform (FFT) has been used as a method for frequency estimation. However, the estimation accuracy cannot meet the requirement of space missions because of the limited spectrum resolution. In order to improve the multi-frequency estimation accuracy, a method based on center of gravity (COG) is proposed. The method improves the estimation accuracy by using the amplitude of the peak points and the neighboring points of the discrete spectrum. For different windows that may be used for signal sampling, a general expression for multi-frequency correction of the windowed signal is derived. Meanwhile, a method based on error integration to reduce the acquisition error is proposed, which solves the problem of acquisition accuracy degradation caused by communication codes. The experimental results show that the multi-frequency acquisition method is able to accurately acquire the three beat-notes of the LHI signal and meet the requirement of space missions.

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Section: Introductionmentioning

confidence: 99%

Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection

Wang

Sui

et al. 2023

Sensors

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Photonic Approach for Unambiguous Measurement of AOA and DFS With Self-Interference Cancellation

Kong

Chen

et al. 2023

IEEE Photon. Technol. Lett.

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Simple DFS and AOA simultaneous measurement scheme without directional ambiguity with co-frequency self-interference signal cancellation

Fang,

2024

Appl. Opt.

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A photonic method based on a dual-polarization dual-parallel Mach–Zehnder modulator (DPol-DPMZM) for the simultaneous measurement of the Doppler frequency shift (DFS) and angle of arrival (AOA) of microwave signals is proposed and demonstrated by simulation. The upper arm of each sub-DPMZM is driven by the echo and self-interference signals from the antenna, while the lower arm is driven by the reference signal 1 and reference signal 2. The phase and amplitude of the reference signal 1 are adjusted to match the interference signals for achieving the self-interference cancellation (SIC). At the central office (CO), the DFS and AOA can be acquired in real time without directional ambiguity by processing the two downconverted low-frequency tones in the photocurrent. The simulation results show that the presence of the SI signal will seriously interfere with the observation of the SOI frequency and waveform, and the self-interference cancellation depth of about 42 dB can be obtained after the SIC. The measurement errors of the DFS without direction ambiguity are within 0.2 Hz. After the Hilbert transformation of the intermediate frequency (IF) signal, the AOA can be measured from −87.31∘ to +87.31∘ with errors less than 3.9°. The system has a large bandwidth, excellent real-time performance, and better invisibility, and is expected to be used in modern electronic warfare systems.

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A Simple Photonic System for DFS and AOA Simultaneous Measurement

Cited by 3 publications

References 27 publications

Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection

Beat-Notes Acquisition of Laser Heterodyne Interference Signal for Space Gravitational Wave Detection

Photonic Approach for Unambiguous Measurement of AOA and DFS With Self-Interference Cancellation

Simple DFS and AOA simultaneous measurement scheme without directional ambiguity with co-frequency self-interference signal cancellation

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