Multichannel signal detection in interference and noise when signal mismatch happens

Liu, Weijian; Li, Jun; Gao, Yun; Wang, Guoshi; Yong-liang, Wang

doi:10.1016/j.sigpro.2019.107268

Cited by 64 publications

(14 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The associate editor coordinating the review of this manuscript and approving it for publication was Mehmet Alper Uslu. are proposed in [12]. In addition, a tunable detector [12] is studied to overcome the problem of worse robustness caused by selective detectors.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Time Reversal Detection in Multistatic Radar System

2020

View full text Add to dashboard Cite

A multistatic radar system can effectively improve the detection performance owing to its spatial diversity property. However, the detection performance will degrade when there exist multipaths. Time reversal has been proved to be able to transform the impact of the multipath into a favorable factor by matching propagation channels to achieve space-time focusing in a monostatic radar system. Therefore, we study the time reversal detection problem in a multistatic radar system with multipath environment in this paper. We divide the detection problems into two scenarios according to whether the channel response is known or not. In both scenarios, the time reversal detector and the conventional detector are derived respectively. Monte-Carlo experiments are used to examine the performance of the four detectors. The simulation results demonstrate that the time reversal detectors have a significant performance enhancement over the conventional detectors for the multistatic radar in a multipath environment, and more multipaths lead to better detection performance for the time reversal detectors. In addition, we also show that the detection probability improves with the increase of the number of radar transceivers. INDEX TERMS Detection, multistatic radar, time reversal.

show abstract

Section: Introductionmentioning

confidence: 99%

“…are proposed in [12]. In addition, a tunable detector [12] is studied to overcome the problem of worse robustness caused by selective detectors. In addition to reducing the adverse effects of multipath on detector performance, it is also a good idea to use multipath characteristics to improve detection results.…”

Section: Introductionmentioning

confidence: 99%

Time Reversal Detection in Multistatic Radar System

2020

View full text Add to dashboard Cite

show abstract

“…The classical differentiator can solve the problem that position signals haven't derivation when there are signal noise [25] [26], but it magnifies signal noise many times. Tracking differentials [27] [28] are used to extract velocity signals, it has a certain inhibitory effect on signal noise.…”

Section: Introductionmentioning

confidence: 99%

Disturbance Rejection Control Using a Novel Velocity Fusion Estimation Method for Levitation Control Systems

Xia

Dou

2020

IEEE Access

View full text Add to dashboard Cite

Magnetic levitation has been applied to maglev trains and magnetic suspension wind tunnel. However, there are some problems with the existing levitation control. For example, it is difficult to extract smooth velocity signals from the gap sensor with noise. The classical differentiator is susceptible to noise, which makes the levitation system sometimes vibrate. The accuracy and stability of levitation control need to be improved. The velocity fusion estimation method (VFE) is proposed to extract the velocity signal from the gap and acceleration sensor, which is theoretically derived to prove that it reduced the noise of the velocity signal. Then disturbance rejection control(DRC) is proposed that add VFE into classical levitation control. Because of the high-quality velocity signal and accelerometer's fast responsiveness, it makes DRC have many advantages. The advantages of using the proposed control structure are that it improved the control accuracy of the target gap and resisted disturbance effectively. Air-gap fluctuations in levitation systems can be reduced in transient pulse disturbance test, white noise disturbance test, and external force disturbance test when it applies the proposed control method. The effectiveness and advantages of the proposed control method are verified by the simulation and experiments.

show abstract

“…have been proposed subsequently. More recently, adaptive detection for multichannel signals receives increasingly attention [9], [10]. In order to ensure the performance loss within 3dB from the optimum bound,…”

Section: Introductionmentioning

confidence: 99%

Model-Based Wald Test for Adaptive Range-Spread Target Detection

et al. 2020

View full text Add to dashboard Cite

For the problem of range-spread target detection, many adaptive detectors commonly estimate the covariance matrix of the disturbance by utilizing the training data without target information. However, in the limited-training case, the conventional detectors suffer significant performance degradation. This paper devises and assesses a model-based Wald detector by modeling the disturbance as an autoregressive (AR) process with unknown parameters, which is able to overcome the detection degradation caused by insufficient training data. Meanwhile, the Wald test reduces the computational complexity because the unknown parameters are only estimated by maximum likelihood criterion under hypothesis that the target exists. Remarkably the asymptotic expression for the probability of detection and false alarm shows the detector is asymptotically constant false alarm rate (CFAR) with respect to the disturbance covariance matrix. The performance evaluation, conducted by resorting to simulation data, has confirmed the effectiveness of the current proposal in comparison with the previously proposed detectors. INDEX TERMS Adaptive detector, autoregressive process, range-spread target, Wald test.

show abstract

Multichannel signal detection in interference and noise when signal mismatch happens

Cited by 64 publications

References 17 publications

Time Reversal Detection in Multistatic Radar System

Time Reversal Detection in Multistatic Radar System

Disturbance Rejection Control Using a Novel Velocity Fusion Estimation Method for Levitation Control Systems

Model-Based Wald Test for Adaptive Range-Spread Target Detection

Contact Info

Product

Resources

About