Adaptive processing technique for enhanced CFAR detecting performance in active sonar systems

2000 ◽  
Vol 36 (2) ◽  
pp. 693-700 ◽  
Author(s):  
Ki Man Kim ◽  
Chungyong Lee ◽  
Dae Hee Youn
Keyword(s):  
Processing Technique ◽  
Adaptive Processing ◽  
Active Sonar ◽  
Sonar Systems

Impact of strong direct blast on active sonar systems

2015 ◽  
Vol 51 (2) ◽  
pp. 894-909 ◽  
Author(s):  
Luzhou Xu ◽  
Jian Li ◽  
Akshay Jain
Keyword(s):  
Active Sonar ◽  
Sonar Systems

scholarly journals A Modified Fast Approximated Power Iteration Subspace Tracking Method for Space-Time Adaptive Processing

2010 ◽  
Vol 2010 ◽  
pp. 1-6
Author(s):  
Yang Zhiwei ◽  
He Shun ◽  
Liao Guisheng ◽  
Ouyang Shan
Keyword(s):  
Processing Technique ◽  
Space Time ◽  
Heterogeneous Environments ◽  
Adaptive Processing ◽  
Subspace Tracking ◽  
Performance Simulation ◽  
Power Iteration ◽  
Radar Applications ◽  
Tracing Algorithm ◽  
Space Time Adaptive Processing

We propose a subspace-tracking-based space-time adaptive processing technique for airborne radar applications. By applying a modified approximated power iteration subspace tracing algorithm, the principal subspace in which the clutter-plus-interference reside is estimated. Therefore, the moving targets are detected by projecting the data on the minor subspace which is orthogonal to the principal subspace. The proposed approach overcomes the shortcomings of the existing methods and has satisfactory performance. Simulation results confirm that the performance improvement is achieved at very small secondary sample support, a feature that is particularly attractive for applications in heterogeneous environments.

Performance comparison of target localization for active sonar systems

2008 ◽  
Vol 44 (4) ◽  
pp. 1371-1380 ◽  
Author(s):  
Suhwan Kim ◽  
Bonhwa Ku ◽  
Wooyoung Hong ◽  
Hanseok Ko
Keyword(s):  
Performance Comparison ◽  
Target Localization ◽  
Active Sonar ◽  
Sonar Systems

scholarly journals An Improved Velocity Estimation Method for Wideband Multi-Highlight Target Echoes in Active Sonar Systems

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2794 ◽  
Author(s):  
Shuxia Huang ◽  
Shiliang Fang ◽  
Ning Han
Keyword(s):  
Matched Filter ◽  
Estimation Method ◽  
Velocity Estimation ◽  
Filter Method ◽  
Improved Method ◽  
Matching Algorithm ◽  
Active Sonar ◽  
Estimation Performance ◽  
Effective Performance ◽  
Sonar Systems

In active sonar systems, the target echoes are usually equivalent to a superposition of the Doppler-scaled reflections from multiple highlights. The reflections overlap with each other both in the time and frequency domain, which results in a decreased velocity estimation performance. Recently, the hyperbolic-frequency modulated signal has been widely employed in sonar systems for moving targets due to its Doppler tolerance, while the precise velocity estimation becomes a great challenge under such conditions. In this paper, the echo c is modeled onsidering a target with a constant velocity and multi-highlights. The velocity estimation performance is analyzed though the signal’s matched filter and the wideband ambiguity function. An improved method based on the sliding window matching algorithm is proposed to improve the performance. The method controls the energy of environmental noise and interference by focusing on the dominant target highlight, and applying a designed window which utilizes the Doppler characteristics of hyperbolic-frequency modulated signals. Simulations and lake experiment allow us to compare between the improved method and the conventional matched filter method. The results verify the influence of the multi-highlights in velocity estimation and indicate that the improved method has more effective performance.

Analysis on Signal Transmission Methods for Rapid Searching in Active SONAR Systems

2018 ◽  
Vol 55 (8) ◽  
pp. 83-93
Author(s):  
Woo-Sung Son ◽  
Young Kwang Seo ◽  
Wan-Jin Kim ◽  
Hyoung-Nam Kim
Keyword(s):  
Signal Transmission ◽  
Active Sonar ◽  
Sonar Systems
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