UACE2017 Proceedings: Transmission Pattern Optimization for Broadband Active Sonar Antennas

• Session:
  Advances in acoustic measurement systems: Technologies and applications
• Paper:
  Transmission Pattern Optimization for Broadband Active Sonar Antennas
• Author(s):
  Christoph Zimmer, Sven Schröder, Dieter Kraus, Nils Theuerkauf, Anton Kummert
• Abstract:
  To achieve a desired steering direction or beam widths transmit antennas in sonar applications usually apply an optimized amplitude and time-delay or phase shading to the individual transducers. Modern active sonar Systems usually operate at larger bandwidths using frequency modulated signals and subsequent matched filtering to maximize the signal to noise ratio. Nevertheless the shading parameters are usually estimated based on monochromatic evaluations e.g. for center- and edge frequencies due to computational reasons. Hence to ensure the performance including the undistortedness of the signal a broadband optimization criterion should be applied.\nIn this paper the shading parameters for a sonar transducer array are optimized to achieve a desired transmission pattern at the matched filter output of the consecutive processing chain. Each transceiver of the antenna is modelled by a single source with an inherent characteristic to calculate the superposition of the delayed signals at a given range or in the far field. The shading parameters are obtained by exploiting numerical optimization techniques. Finally, the transmit characteristics obtained by the broadband and the narrowband optimization are compared by their angular dependent matched filter response.
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Contact details

• Contact person:
  Mr Christoph Zimmer
• e-mail:
  
• Affiliation:
  Bergische Universität Wuppertal
• Country:
  Germany