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[IEEE 2018 IEEE Statistical Signal Processing Workshop (SSP) - Freiburg im Breisgau, Germany (2018.6.10-2018.6.13)] 2018 IEEE Statistical Signal Processing Workshop (SSP) - A Group Invariance Approach to a Very Weak LFM Signal Detection
摘要： This paper considers the detection of a very low signal to noise ratio (SNR), linear frequency modulated (LFM) radar waveforms from data received by a wideband receiver. The optimal method involves a computationally intensive two dimensional search. Faster alternatives, include the discrete ambiguity approach to LFM detection/estimation which is computationally efficient but is well known to be applicable only at moderately high SNR, while the windowed Fourier transform can be used to detect low SNR signals, but only for quite small chirp rates. Here we utilize multiple time and frequency shifts applied to the received data to structure the problem as one of detection of a multi-channel unknown rank-one component in noise. Our method which involves only a one dimensional search over chirp rate, works at very low SNR and can handle multiple signals and interferers The generalized-likelihood ratio test (GLR), the Bayesian test are discussed and compare with the generalized coherence test. The detection performance are demonstrated through numerical simulations.
关键词： GLRT,LFM signal,rank-one signal,Bayesian test,generalized coherence
更新于2025-09-23 15:22:29
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Photonics-based receiver for decoupled velocity and range measurement
摘要： Photonics-based receiver for decoupled velocity and range measurement is proposed and demonstrated. A dual-chirp LFM signal is used. At the receiver, the reference signal and the received echoes are modulated to the optical carrier, respectively. By introducing the micro- wave photonic image reject mixing, the frequency components corresponding to the target range and ve- locity can be obtained simultaneously. No complex simulation source in electrical digital domain is needed, and no special requirement with the dual-chirp LFM sig- nals is required. A proof-of-concept experiment is taken. A dual-chirp LFM signal centered at 10 GHz with a 4- GHz bandwidth is used. The target range and the Dop- pler-frequency shift are successfully obtained.
关键词： microwave photonics,LFM signal,dual-chirp,velocity,range
更新于2025-09-16 10:30:52