Calibrating a 90-kHz multibeam sonar

被引：5

作者：

Chu, DZ ^{[1
]}

Foote, KG ^{[1
]}

Hufnagle, LC ^{[1
]}

Hammar, TR ^{[1
]}

Liberatore, SP ^{[1
]}

Baldwin, KC ^{[1
]}

Mayer, LA ^{[1
]}

McLeod, A ^{[1
]}

机构：

[1] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA

来源：

OCEANS 2003 MTS/IEEE: CELEBRATING THE PAST...TEAMING TOWARD THE FUTURE | 2003年

关键词：

D O I：

10.1109/OCEANS.2003.178119

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

Quantitative use of multibeam sonar requires calibration. Protocols for calibrating multibeam sonar in an absolute sense by means of a standard target are being developed. These protocols are illustrated for the Simrad SM2000 Multibeam Echo Sounder, with 90-kHz operating frequency and 300 beams over a 90-deg sector (+/-45 deg), each of nominal beamwidth 1.5x1.5 deg. In a sea well on Iselin Dock at the Woods Hole Oceanographic Institution, directional characteristics of the sonar were measured at the farfield range of 23 m in a sea well. At the large freshwater indoor tank at the University of New Hampshire, similar characteristics of directivity were measured at the nearfield range of 11.7 m. Beamforming was accomplished by digital signal processing. Beam patterns are presented and compared at both ranges. In addition, measurements of the on-axis response were made for each available time-varied-gain function, enabling linearity and dynamic range to be assessed.

引用

页码：1633 / 1636

页数：4

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