passive acoustic monitoring of moving targets by sparse underwater ...

More documents

Recommendations

Info

Part IV i submitted as: Zetterberg, Viktoria and Pettersson, Mats I. and Claesson, Ingvar, Passive imaging of moving continious broadband sound source within a sensor field, Submitted to IEEE Oceanic Engineering
Imaging of moving continious broadband sound source within a sensorfield 53 Passive imaging of moving continious broadband sound source within a sensor field Viktoria Zetterberg, Mats I. Pettersson and Ingvar Claesson November 17, 2008 Abstract Sparsely distributed sensors or sparse arrays are associated with high positional accuracy and capability for large area surveillance. This article shows, both through simulations and with real measurement data, that sparse sensor systems can be used to accomplish highperformance underwater surveillance. The article focuses on measurement setups with several passive single hydrophones placed hundreds of meters apart, combined to a sparse array in shallow water. A sound source is then more likely to move inside the array, and thus near-field processing has to be considered. In this way, images of the coherent sound activity for different sensor pairs are formed, and every sensor pair map is summarized into a resulting map. By using all sensor pairs, the systems become more robust against multipath interference. Good correlation results are shown despite the fact that the sound source is at the same distance as the baseline of the sensor pairs. This is achieved by Doppler compensating for target movement and also by whitening of the cross-spectra. The analyses of the measurements also show that baseline-dependent bandwidth can improve the results. In the paper, it is indicated from experimental data that two propeller sound sources could be resolved, and in another measurement setup the engine could be separated from the propellers. 1 Introduction In the recent decades there has been a dramatic development in the area of digital signal processing. More effective computers have led to the fact that more computationally demanding processing methods can be used. An increased interest in systems of sparsely distributed sensors or sparse arrays for surveillance has been seen in recent years. This is due to better computational
Page 1:
Passive Acoustic Monitoring of Movi
Page 5 and 6: Blekinge Institute of Technology Li
Page 7 and 8: White White White White Abstract v
Page 9: White White White White vii Preface
Page 13: White White White White xi Contents
Page 16 and 17: 14 White White White White 2005 MTS
Page 18 and 19: 16 White Introduction White White f
Page 20 and 21: 18 White Introduction White White C
Page 22 and 23: 20 White Introduction White White C
Page 24 and 25: 22 White Introduction White White (
Page 26 and 27: 24 White Introduction White White P
Page 28 and 29: 26 White Introduction White White R
Page 30 and 31: Part I has been published as: Zette
Page 32 and 33: 30 White Part I III. GENERALIZED CR
Page 34 and 35: 32 White Part I Fig. 6 show a momen
Page 36 and 37: 34 White Part I REFERENCES [1] B. X
Page 38 and 39: Part II has been published as: Zett
Page 40 and 41: 38 White Part II GCC function [4] i
Page 42 and 43: 40 White Part II C. Frequency depen
Page 44 and 45: 42 White Part II a pair, thereby en
Page 46 and 47: Part III has been published as: Zet
Page 48 and 49: 46 White Part III xm 1 ( t) s( t)
Page 50 and 51: 48 White Part III VI. RESULTS To il
Page 52 and 53: 50 White Part III ACKNOWLEDGMENT Th
Page 56 and 57: 54 White Part IV capabilities and t
Page 58 and 59: 56 White Part IV However, with the
Page 60 and 61: 58 White Part IV Table 1: Target, e
Page 62 and 63: 60 White Part IV 1B, the engine sou
Page 64 and 65: 62 White Part IV 140 130 Magnitude
Page 66 and 67: 64 White Part IV coordinate system
Page 68 and 69: 66 White Part IV Table 3: Differenc
Page 70 and 71: 68 White Part IV drawn for zero del
Page 72 and 73: 70 White Part IV 60 Bandwidth depen
Page 74 and 75: 72 White Part IV 5.2.2 Results For
Page 76 and 77: 74 White Part IV Figure 15: Setup 1
Page 78 and 79: 76 White Part IV 5.3.2 Results The
Page 86 and 87: 84 White Part IV 4040, Orlando, FL,
Page 90: ABSTRACT Surveillance of sound acti
show all

passive acoustic monitoring of moving targets by sparse underwater ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?