Sidelobe suppression versus phase error characteristics of multistage modulation scanning sonar systems

1980 ◽  
Vol 68 (6) ◽  
pp. 1699-1703 ◽  
Author(s):  
J. F. Lynch ◽  
S. P. Pitt ◽  
J. G. Pruitt
Keyword(s):  
Phase Error ◽  
Sidelobe Suppression ◽  
Versus Phase ◽  
Error Characteristics ◽  
Sonar Systems

scholarly journals Reference Phase Stabilizer for Distributed Underwater Sonar Systems

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4279
Author(s):  
Lijie Yang ◽  
Ruirui Dang ◽  
Chunyi Song ◽  
Zhiwei Xu
Keyword(s):  
Clock Synchronization ◽  
Phase Error ◽  
Phase Variation ◽  
Phase Shifters ◽  
Sensor Nodes ◽  
Detection Accuracy ◽  
Sonar Systems ◽  
Phase Variations ◽  
The Impact ◽  
Central Station

An optical fiber is a promising approach for data and clock transmission in distributed underwater sonar systems. However, synchronization is a critical challenge in distributed sonar systems, which mandates accurate clock synchronization down to a sub degree. Potential phase misalignment is caused by fiber length variations. In this paper, we propose a fiber-based phase stabilizer method to achieve accurate clock synchronization among sensor nodes. We use fiber-based feedback loop between sensor nodes and central station unit to monitor phase variations. Subsequently, we leverage phase shifters symmetrically arranged on the forward lane and feedback lane to compensate real-time phase variation and maintain high-precision synchronization. Besides, an ambiguity eliminator circuit is designed to remove the clock’s cyclic ambiguity. Both analysis and experimental results suggest that the proposed phase stabilizer can achieve 10 MHz reference clock synchronization within 0.4 degree. We also analyze the impact of the reference clock’s phase error on the system range detection accuracy, which indicates that the proposed phase stabilizer can greatly improve detection accuracy of sonar systems.

Review of Animal sonar systems.

1980 ◽  
Vol 25 (11) ◽  
pp. 942-943
Author(s):  
DONALD A. DEWSBURY
Keyword(s):  
Sonar Systems

Sonar operator performance considerations in passive sonar systems

1975 ◽  
Author(s):  
R. J. Hornick ◽  
G. Yamashita ◽  
J. E. Robinson ◽  
H. J. Winkler
Keyword(s):  
Operator Performance ◽  
Passive Sonar ◽  
Sonar Systems ◽  
Performance Considerations

Applications of c.c.d.s to sonar systems

1980 ◽  
Vol 127 (2) ◽  
pp. 125 ◽  
Author(s):  
J.F. Dix ◽  
N. Dean ◽  
J. Widdowson ◽  
J. Mavor
Keyword(s):  
Sonar Systems

RF Phase Error Built-In-Self-Test for A GSM SOC

2008 ◽  
Vol 1 (4) ◽  
pp. 39-44
Author(s):  
Dallas Webster ◽  
Loi Phan ◽  
Oren Eliezer ◽  
Rick Hudgens ◽  
Donald Lie
Keyword(s):  
Phase Error ◽  
Self Test ◽  
Built In Self Test
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