Journal of Systems Engineering and Electronics ›› 2010, Vol. 21 ›› Issue (2): 186-190.doi: 10.3969/j.issn.1004-4132.2010.02.003

• ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

Waveform diversity based sonar system for target localization

Lijie Zhang1,2,*,Jianguo Huang1,Yong Jin1,Yunshan Hou1,Min Jiang1,and Qunfei Zhang1   

  1. 1.College of Marine,Northwestern Polytechnical University,Xi’an 710072,P.R.China;
    2.Yichang Testing Technique Research Institute,Yichang 443003,P.R.China
  • Online:2010-04-26 Published:2010-01-03
  • Contact: Lijie Zhang

Abstract:

A new monostatic array system taking advantage of
diverse waveforms to improve the performance of underwater tar-
get localization is proposed.Unlike the coherent signals between
different elements in common active array,the transmitted signals
from different elements here are spatially orthogonal waveforms
which allow for array processing in the transit mode and result in
an extension of array aperture.The mathematical derivation of
Capon estimator for this sonar system is described in detail.And
the performance of this orthogonal-waveform based sonar is an-
alyzed and compared with that of its phased-array counterpart by
water tank experiments.Experimental results show that this sonar
system could achieve 12 dB?15 dB additional array gain over its
phased-array counterpart,which means a doubling of maximum
detection range.Moreover,the angular resolution is significantly
improved at lower SNR.