Dissertation > Excellent graduate degree dissertation topics show

Apply Homomorphic Filtering Technology to Underwater Acoustic Channel

Author: LiShuang
Tutor: LiangGuoLong
School: Harbin Engineering University
Course: Signal and Information Processing
Keywords: Homomorphic Filtering Multi-path Fading Complex Cepstrum Signal Reconstruction Delay Estimation
CLC: TN929.3
Type: Master's thesis
Year: 2010
Downloads: 118
Quote: 0
Read: Download Dissertation

Abstract


Underwater acoustic signals passing through the multi-path fading channel, will suffer a serious distortion, and make it difficult for follow-up positioning solution. So how to pick up the direct sound which is added by the reflected sound in order to reconstruct the original signals, has been of concern in topic. Different disciplines not only develop on their own but also promote each other or even a combination. In speech, images, ultrasonic testing and other scientific fields there are much in common in signal processing. The original intention of this dissertation is trying to apply the homomorphic filtering technology which has been proven mature in the field of speech and image to resolve the underwater acoustic multi-path fading channels.Homomorphic filtering which meets the broad principle of superposition is a nonlinear signal processing technology. The main direction of this dissertation is to apply homomorphic filtering technology to the signal and channel separation. First of all, paper introduces the basic theory of homomorphic filtering technology and the problems which are encountered in the calculation and the corresponding solutions. Then analyzes what is the impact of multi-path fading channel on the positioning systems. The dissertation studies the features of the channel and the signal respectivly in the cepstral domain and the key factors to seprate the signal and the channel.Homomorphic filtering technology has many applications in underwater acoustic signal processing. The dissertation will discusse three applications, they are signal detection, time-delay estimation and target identification. Chapter IV major research in applying homomorphic filtering to detect whether a signal has been added by its delay signal, and to restore the original signal, then simulate the effectiveness of this algorithm under three kinds of typical channel model. The other two applications which are picking passive time delay and picking the frequency of ship radiated noise will be researched in the fifth chapter. There will be detailed simulation and the results showe that homomorphic filtering technique is a simple and convenient anti-multi-path technology. This technique will have a good prospect in underwater acoustic signal processing applications. The dissertation provides a detailed theoretical guidance for future engineering applications.

Related Dissertations

  1. Algorithm Research on SINS/GPS Integrated Navigation Syste,V249.328
  2. Based on electronic speckle pattern interferometry displacement measurement,TP274
  3. Based on under-sampled signal reconstruction algorithm,TN911.72
  4. MIMO Systems and properties of block coding techniques,TN919.3
  5. Design and Implementation of Speech Enhancement System Based on Microphone Array,TN912.35
  6. Research on Radio Wave Propagation Characteristic of Spacecraft Telemetry Receiving on the Sea,TN011
  7. Design and Implementation Ofsound Localization System Based on Wireless Senor Network,TN912.2
  8. Study on the Technology and Demonstration System of Explosion Location with Acoustic Sensor Network,TN919.8
  9. Research on Mobile Speed Estimation in Wireless Cellular Systems,TN929.53
  10. Research on TDE and DOA Estimation Methods in the Presence of Impulsive Noise,TN911.72
  11. Measured based on the source of the low signal-to-noise ratio of the microphone array multi- voice technology research,TN912.3
  12. Diversity & Combing Technology under Multi-path Fading Channel,TN92
  13. GSM-R Communication Analysis under High-speed Movement Enviroment,TN929.532
  14. Range-gated underwater target three-dimensional imaging technology to reproduce,TP391.41
  15. Design and Implementation of Image Enhancement System Based on DSP,TP391.41
  16. Study on Time Delay Estimation of Narrow-band Signals in Wireless Passive Position,TN95
  17. Secondary delay estimation algorithm based on wavelet transform acoustic positioning technology and experimental research,TP391.41
  18. Sound source direction finding in multipath environment,TB566
  19. Research on Passive Localization Method of Noise Target,TB52
  20. Research on Leak Detection and Location of Pipeline,TG115.28

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Underwater communication ( Sonar communication)
© 2012 www.DissertationTopic.Net  Mobile