Detection of signals of unknown duration by multiple energy detectors

Vergara, Luis; Moragues, Juan J.; Gosalbez, J.; Salazar, Addisson

doi:10.1016/j.sigpro.2009.08.007

Cited by 12 publications

(11 citation statements)

References 6 publications

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“…For instance, if the signal is of unknown length, it has been proposed that using multiple energy detectors (MED), each with a layered signal length estimate (N, N/2, N/4, ... ,N/L), where N is the estimated signal length and L is the number of layers, can provide reasonable performance when compared to the standard ED where the length is known (Vergara et al, 2010). However, the optimum performance for this detector occurs when the number of layers is equal to one and the estimated signal duration is the actual duration.…”

Section: Energy Detection Backgroundmentioning

confidence: 99%

Robust acoustic signal detection and synchronization in a time varying ocean environment

Gieleghem¹

2012

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Signal detection and synchronization in the time varying ocean environment is a difficult endeavor. The current common methods include using a linear frequency modulated chirped pulse or maximal length sequence as a detection pulse, then match filtering to that signal. In higher signal to noise ratio (SNR) environments (-0 dB and higher) this has been a suitable solution. As the SNR drops lower however, this solution no longer provides an acceptable probability of detection for a given tolerable probability of false alarm. The issue derives from the inherent coherence issues in the ocean environment which limit the useful matched filter length. This thesis proposes an alternative method of detection based on a recursive least squares linearly adaptive equalizer which we term the Adaptive Linear Equalizer Detector (ALED). This detectors performance has demonstrated reliable probability of detection with minimal interfering false alarms with SNR as low as -20 dB. Additionally this thesis puts forth a computationally feasible method for implementing the detector.

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Section: Energy Detection Backgroundmentioning

confidence: 99%

Robust acoustic signal detection and synchronization in a time varying ocean environment

Gieleghem¹

2012

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“…This question is addressed in [7] where the theoretical bases of a method consisting on using multiple EDs matched to different novelty durations is presented. Thereby, assuming that the observation vector y corresponds to N time samples, we consider L layers of partitions consisting on successive segmentation by a factor of 2 of the original observation interval (dimension N ).…”

Section: Detection Of Acoustic Signals With Unknown Duration and mentioning

confidence: 99%

“…The theoretical problem of detecting unknown signals with unknown duration has been previously presented in [7], where a multiple energy detector (MED) structure is implemented in order to match the different possible signal durations. No evaluation results of this novel approach have been performed in any real scenario or practical application, but the improvements provided by the theoretical results justify the utility and applicability to acoustic scenarios.…”

Section: Introductionmentioning

confidence: 99%

Improving Detection of Acoustic Signals by Means of a Time and Frequency Multiple Energy Detector

Moragues

Serrano

Vergara

et al. 2011

IEEE Signal Process. Lett.

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Institute of Electrical and Electronics Engineers (IEEE)MoraguesAbstract-Standard energy detectors (ED) are optimum to detect unknown signals in presence of uncorrelated Gaussian noise. However, in real applications the signal duration and bandwidth are unpredictable and this fact can considerably degrade the detection performance if the appropriate observation vector length is not correctly selected. Therefore, a multiple energy detector (MED) structure is applied in the time as well as in the frequency domain and it is evaluated in real acoustic scenarios. The results obtained demonstrate the robustness of the MED structure and the improvements in performance reached in comparison to the standard ED.Index Terms-multiple energy detector, acoustic event, frequency and time detection.

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“…This can be especially interesting for the eld of novelty detection, where specic parameters of the signal are entirely unknown [89]. Multiple energy detectors were applied to subintervals of the original observation interval, leading to a multiple energy detector (MED) structure where signal presence was decided if at least one of the EDs was in favor.…”

Section: Discussionmentioning

confidence: 99%

“…One could devise many strategies for partitioning the initial observation vector of dimension N , but in absence of any a priori information, L layers of partitions are considered to correspond to dierent segmentation degrees of the original observation length [89]. …”

Section: Description Of the Multiple Energy Detector Structurementioning

confidence: 99%

New energy detector extensions with application in sound based surveillance systems

Escrivá¹

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Detection of signals of unknown duration by multiple energy detectors

Cited by 12 publications

References 6 publications

Robust acoustic signal detection and synchronization in a time varying ocean environment

Robust acoustic signal detection and synchronization in a time varying ocean environment

Improving Detection of Acoustic Signals by Means of a Time and Frequency Multiple Energy Detector

New energy detector extensions with application in sound based surveillance systems

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