#UDT2019 Motivation #UDT2019 Beamforming #UDT2019 Beamforming - - PowerPoint PPT Presentation

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#UDT2019 Motivation #UDT2019 Beamforming #UDT2019 Beamforming - - PowerPoint PPT Presentation

Jan 17, 2023 101 likes •301 views

Multiple-Input-Multiple-Output (MIMO-) High-Resolution Monostatic Sonar for Target Detection Dr.-Ing. Tim Claussen, Dipl.-Ing. Gunnar Zindel #UDT2019 Motivation #UDT2019 Beamforming #UDT2019 Beamforming #UDT2019 Receive beamforming vs.

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#UDT2019 Multiple-Input-Multiple-Output (MIMO-) High-Resolution Monostatic Sonar for Target Detection

Dr.-Ing. Tim Claussen, Dipl.-Ing. Gunnar Zindel

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#UDT2019

Motivation

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#UDT2019

Beamforming

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#UDT2019

Beamforming

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#UDT2019

Receive beamforming vs. Transmit beamforming

Transmit beamforming:

  • Steering cannot be changed afterwards
  • Transmit direction is irrevocable imposed inside the receive signals
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#UDT2019

Beampattern

  • Important measure for the resolution of the beamformer
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#UDT2019

Beamformer performance modification

  • Goal: Decrease W and increase H
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#UDT2019

Beamformer performance modification

  • Possibility 1: Increase the amount of hydrophones to enlarge the aperture
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#UDT2019

Beamformer performance modification

  • Possibility 2: Increase the hydrophone spacing
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#UDT2019

The MIMO principle

The typical active sonar system:

  • Single-input-multiple-output (SIMO) sonar
  • One coherent transmit signal (e.g. CW or FM) is transmitted

Multiple-input-multiple-output (MIMO) sonar:

  • Transmits on every transmitter channel different signals
  • Orthogonal signal design
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#UDT2019

The MIMO principle

The simples SIMO case:

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#UDT2019

The MIMO principle

Two transmitter, one receiver:

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#UDT2019

The MIMO principle

Transmitter side:

  • Independent, orthogonal signals
  • No transmission beam is formed

Receiver side:

  • Divide the signals –matched filter –
  • “Re-cohere” the signals with

ELAC Nautik’s MIMO Sonar technique

  • Prior knowledge
  • Restore orthogonality
  • Beamforming
  • Equivalent to SIMO
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#UDT2019

The MIMO principle

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#UDT2019

The MIMO principle

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#UDT2019

The MIMO principle

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#UDT2019

The MIMO principle

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Conclusion

  • Subsequent transmit beamforming
  • Additional degree of freedom
  • Virtually enlarging aperture
  • Drastic increase of the spatial resolution