A Correlation Detection Method of Low SNR Based on Multi-Channelization

Nie, Donghu; Xie, Kai; Zhou, Feng; Qiao, Gang

doi:10.1109/lsp.2020.3013769

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…For two signals x(t) and y(t) with limited signal energy, their correlation functions are defined, as the distance between the laser screens is not large [16].…”

Section: Detection Methods Of Correlation Algorithmmentioning

confidence: 99%

Data Processing Approaches to Measure Velocity of Electromagnetic Gun on Laser Screen in Complex Environment

Hao

Liu

et al. 2022

Sensors

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The exit velocity of the armature is an important indicator in measuring the launching performance of the electromagnetic gun. The non-contact photoelectric detection technology with the use of a laser screen was applied to the measurement of the armature velocity of the electromagnetic gun. By means of taking the signals that pass through the laser screen obtained by the velocity measurement system as the research object, we solved problems such as the harsh test environment of the launch armature velocity of the electromagnetic gun, the interferences on the armature signal passing through the laser screen unavoidably caused by various factors such as vibration, electromagnetic interference, shock wave, flare, smoke and fragments, and even the non-recognition of the signal passing through the laser screen in severe cases. A data-processing algorithm that combines the Ensemble Empirical Mode Decomposition (EEMD) with Correlation Algorithm (CA) was proposed, with the aim of processing the signals passing through the laser screen, while using the maximum slope point as the time passing through the laser screen so as to calculate the velocity of the armature passing the laser screen. This method can effectively reduce the influence of interference on the test results, and the test results from two sets of velocity measuring systems show that the velocity obtained by the proposed approach is highly consistent.

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“…For two signals x(t) and y(t) with limited signal energy, their correlation functions are defined, as the distance between the laser screens is not large [16].…”

Section: Detection Methods Of Correlation Algorithmmentioning

confidence: 99%

Data Processing Approaches to Measure Velocity of Electromagnetic Gun on Laser Screen in Complex Environment

Hao

Liu

et al. 2022

Sensors

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show abstract

“…However, EEG acquisition needs to be carried out under the guidance of experts, and the wearing of the equipment will also affect the sleep state of the subjects [ 26 ]. The preprocessing [ 27 ], recognition [ 28 ] and analysis [ 29 ] of EEG signal are complicated [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Automatic Detection of the Cyclic Alternating Pattern of Sleep and Diagnosis of Sleep-Related Pathologies Based on Cardiopulmonary Resonance Indices

Cui

Huang

Wu³

2022

Sensors

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The cyclic alternating pattern is the periodic electroencephalogram activity occurring during non-rapid eye movement sleep. It is a marker of sleep instability and is correlated with several sleep-related pathologies. Considering the connection between the human heart and brain, our study explores the feasibility of using cardiopulmonary features to automatically detect the cyclic alternating pattern of sleep and hence diagnose sleep-related pathologies. By statistically analyzing and comparing the cardiopulmonary characteristics of a healthy group and groups with sleep-related diseases, an automatic recognition scheme of the cyclic alternating pattern is proposed based on the cardiopulmonary resonance indices. Using the Hidden Markov and Random Forest, the scheme combines the variation and stability of measurements of the coupling state of the cardiopulmonary system during sleep. In this research, the F1 score of the sleep-wake classification reaches 92.0%. In terms of the cyclic alternating pattern, the average recognition rate of A-phase reaches 84.7% on the CAP Sleep Database of 108 cases of people. The F1 score of disease diagnosis is 87.8% for insomnia and 90.0% for narcolepsy.

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“…In [21], a power spectral density (PSD) reprocessing method is proposed to evaluate the period of pseudorandom code in weak spread spectrum signals. A detection method for a weak hydroacoustic signal is presented in [22], where a correlation between segments of the received waveform is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Detection and Direction-of-Arrival Estimation of Weak Spread Spectrum Signals Received with Antenna Array

Magiera

2021

Electronics

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This paper presents a method for the joint detection and direction of arrival (DOA) estimation of low probability of detection (LPD) signals. The proposed approach is based on using the antenna array to receive spread-spectrum signals hidden below the noise floor. Array processing exploits the spatial correlation between phase-delayed copies of the signal and allows us to evaluate the parameter used to make the decision about the presence of LPD transmission. The DOA estimation is based on the covariance between signals received by sensors for the fixed geometry of the antenna array. Moreover, the paper provides a method for mitigating narrowband interferences prior to signal detection. The presented methods were verified through simulations which proved that the confident detection of a one-second transmission in an additive white Gaussian noise channel is possible even when the noise is 24 dB higher than the power of the received signal. The performance of DOA estimation is analyzed in a wide range of signal-to-noise and interference-to-noise ratios. It is found that the DOA may be estimated with an RMS error not exceeding 10 degrees, even if interference occupies 15% of the analyzed frequency band.

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A Correlation Detection Method of Low SNR Based on Multi-Channelization

Cited by 11 publications

References 16 publications

Data Processing Approaches to Measure Velocity of Electromagnetic Gun on Laser Screen in Complex Environment

Data Processing Approaches to Measure Velocity of Electromagnetic Gun on Laser Screen in Complex Environment

Automatic Detection of the Cyclic Alternating Pattern of Sleep and Diagnosis of Sleep-Related Pathologies Based on Cardiopulmonary Resonance Indices

Detection and Direction-of-Arrival Estimation of Weak Spread Spectrum Signals Received with Antenna Array

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