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Computationally robust and noise resistant numerical detector for the detection of atmospheric infrasound
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10.1121/1.4807802
/content/asa/journal/jasa/134/1/10.1121/1.4807802
http://aip.metastore.ingenta.com/content/asa/journal/jasa/134/1/10.1121/1.4807802
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) Diagram of I53US array configuration. Geographic north and east are directed toward positive y- and x-axes (measured in km), respectively. Microphone locations and the center of mass of the array are marked by ○ and × , respectively.

Image of FIG. 2.
FIG. 2.

(Color online) Detection summary plot of microbaroms on January 8, 2005 at I53US. Subplots from top to bottom show the distribution of the MCCM, , DOA, and as a function of universal time. The characterization parameters are estimated using data from all eight sensors of the array. Each data point × represents a one-minute time window (or 1200 points).

Image of FIG. 3.
FIG. 3.

(Color online) Detection summary plot of microbaroms on January 8, 2005 at I53US. The format is same as Fig. 2 except that the characterization parameters are calculated using data from only four sensors [4 and 6-8] of the array. Detected microbarom events (the MCCM > 0.8 and value <0.15 s) are enclosed by ○'s. The persistent pattern in the distribution of and DOA suggest that strong microbarom activity is present throughout the day.

Image of FIG. 4.
FIG. 4.

(Color online) (a) An example of mine-blasts observed at I53US on February 24, 2007. (b)–(d) ROC curves corresponding to the MCCM, SSVR1, and SSVR2 detectors for the mine-blasts with Gaussian noise, as a function of SNR's. The solid, dashed, solid, dashed-dot, and solid curves indicate SNR's at −3, −5, −7, −9, and −11 dB. (e)−(g) ROC curves corresponding to the MCCM, SSVR1, and SSVR2 detectors for the mine-blasts with Pink noise, as a function of SNR's. See text for details.

Image of FIG. 5.
FIG. 5.

(Color online) An example of microbaroms observed at I53US on September 25, 2006. (b)–(g) ROC curves corresponding to the MCCM, SSVR1, and SSVR2 detectors for themicrobaroms with Gaussian and Pink noise. The format is same as Fig. 4 except that the legend for the ROC curves is located in Fig. 5(d) .

Image of FIG. 6.
FIG. 6.

(Color online) An example of mountain associated waves observed at I53US on November 22, 2006. (b)–(g) ROC curves corresponding to the MCCM, SSVR1, and SSVR2 detectors for the MAWs with Gaussian and Pink noise. The format is same as Fig. 5 .

Image of FIG. 7.
FIG. 7.

(Color online) Comparison of computational times for the SSVR2 detector against the F-stat and MCCM detectors, as functions of signal length and array size (number of sensors). Semi-log scale is used for axis representing the ratio of computational time between two detectors and axis represent the number of sensors in an array. See text for details.

Image of FIG. 8.
FIG. 8.

(Color online) Comparison of the MCCM and SSVR2 detector values for microbaroms (○) and clutter (×) detected in Fig. 3 , as a function of the array geometry. (a) and (b) correspond to a five-sensor array [1–5]: (c) and (d) a six-sensor array [1–2 and 5–8]: (e) and (f) a seven-sensor array [1–7]: and (g) and (h) an eight-sensor array. See Fig. 1 for actual array geometry for the I53US. The MCCM values for microbaroms and clutter in (a) and (b) are significantly lower than those in the plots for the other array configurations.

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/content/asa/journal/jasa/134/1/10.1121/1.4807802
2013-07-11
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Computationally robust and noise resistant numerical detector for the detection of atmospheric infrasound
http://aip.metastore.ingenta.com/content/asa/journal/jasa/134/1/10.1121/1.4807802
10.1121/1.4807802
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