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Seminar "Selected Topics in Underwater Signal Processing"

 

Basic Information

 
 
Seminar overview  
  Lecturers:   Gerhard Schmidt and group  
  Semester:   Summer term  
  Language:   English or German  
  Target group:   Master students in electrical engineering and computer engineering  
  Prerequisites:   Fundamentals in digital signal processing  
  Registration
procedure:
 

If you want to sign up for this seminar, you need to register with the following information in the registration form

  • surname, first name,
  • e-mail address,
  • matriculation number,

Please note that the registration period starts 01.10.2019 at 8:00 h and ends 25.10.2019 at 23:59 h. All applications before and after this registration period will not be taken into account.

Registration will be possible within the before mentioned time under the following subsite - Seminar Registration.

During the registration process you will also choose your seminar topic. Only one student per topic is permitted (first come - first serve).

The registration is binding. A deregistration is only possible by sending an e-mail with your name and matriculation number to This email address is being protected from spambots. You need JavaScript enabled to view it. until Sunday, 18.10.2019 at 23:59 h. All later cancellations of registration will be considered as having failed the seminar.

 
  Time:   Preliminary meeting, DSS Library, 28.10.2019 at 16:30 h
Written report due on 17.02.2020
Final presentations, Aquarium, 26.02.2020 at 10:00 h
 
  Contents:  

Students write a scientific report on a topic closely related to the current research of the DSS group. Potential topics, therefore, deal with digital signal processing related to underwater applications.

Students will also present their findings in front of the other participants and the DSS group.

 

 

Topics

 
 
Topic title   Description  
  Achieving Orthogonality
under Constraint Presets
by given Hardware Limitations
of SONAR Systems
 

The essential advantage of MIMO SONAR systems yields from the possibility to transmit nearly perfectly orthogonal sequences. Given the assumption that all transmitted orthogonal sequences can be recovered at the receive side, this leads to a more sophisticated processing and more flexibility e.g. due to “offline” changeability of “transmit” beamforming directions.

In this seminar, first orthogonality should be specified and based on this, possible (not necessarily perfect) techniques to achieve orthogonality of signals should be examined and discussed. All investigations should be done under the consideration of given hardware/software limitations. Conclusively, the impact of non-perfect orthogonality should be considered given previous findings.

 
  Tracking of Multiple
Targets using Joint
Probabilistic Data Association
 

Target tracking in both SONAR and Radar applications make use of the Probabilistic Data Association (PDA) method. The method is suitable for tracking of one or more targets, in case they are well separated. However, if there are several target objects, events can occur in which a measurement is associated with several tracks. This is exactly the case when the measurement is in the gating range of two or more targets. In order to master these events, the Joint Probabalistic Data Assiciation (JPDA) method is often used. As part of this seminar topic, the last five scientific papers on this topic are to be found and summarized into one paper. For the beginning, some papers of renowned authors will be provided.

 
  Comparison of
Underwater Communication Modems
 

The underwater acoustic channel is one of the most challenging channels for communication. Because of damping and dispersion, high-frequency communication is not usable for longer distances underwater. Nevertheless, underwater modems are frequently used for monitoring purposes, controlling AUVs or speech communication, using comparably low data-rates.  Nearly all commercially available modems use different modulation schemes and are capable of different data-rates. In this seminar the used modulation schemes, the data-rates and transmit power of the available modems should be examined and discussed.  Conclusively, the robustness and the possible range of the modems should be addressed and a recommendation for a suitable modulation scheme for a short to mid-range speech communication should be given.

 
  Multi-Channel
Wiener Filter
 

In current systems for localization of underwater objects multiple receiving elements are used to achieve a certain directivity for detection. These receiving elements are arranged in an array and therefore exposed to coherent noise like waterflow and mechanical vibrations. While classic delay-and-sum-beamformers don't accommodate for these noise sources, a multi-channel Wiener filter will take these disturbances into account and will obtain a more robust solution. The goal of this seminar is to find and summarize literature about the multi-channel Wiener filter and it's application in beamforming purposes.