Sensor-actuator panels for underwater acoustic control

1996 ◽  
Author(s):  
Robert D. Corsaro ◽  
Brian H. Houston
Keyword(s):  
Underwater Acoustic ◽  
Sensor Actuator ◽  
Acoustic Control

FH-FSK Underwater Acoustic Control and Communication System Based on LDPC Code

2014 ◽  
Vol 511-512 ◽  
pp. 375-380
Author(s):  
Ji Gang Dong ◽  
Da Jun Sun ◽  
You Wen Zhang ◽  
Wei Wei Fan
Keyword(s):  
Communication System ◽  
Convolutional Code ◽  
Gaussian White Noise ◽  
Ldpc Code ◽  
Parity Check ◽  
Underwater Acoustic ◽  
Low Density Parity Check ◽  
Acoustic Control ◽  
Shift Keying ◽  
Parity Check Codes

In this paper, a frequency-hopping frequency-shift keying (FH-FSK) underwater acoustic control and communication system based on Low Density Parity Check Codes (LDPC) is proposed by combining with FH-FSK system and LDPC. The anti-jamming performance of the system in the condition of Gaussian white noise and coherent multi-path channel is simulated respectively. The simulation result shows that FH-FSK system based on LDPC has a better performance than that of convolutional code. Therefore, it is more applicable for the system to have a stable anti-jamming performance and better robustness.

Piezocomposite actuator designs for an active underwater acoustic control system coating

1990 ◽  
Vol 87 (S1) ◽  
pp. S17-S17
Author(s):  
Thomas R. Howarth ◽  
Xiaoqi Bao ◽  
Vijay K. Varadan ◽  
Vasundara V. Varadan ◽  
Kim C. Benjamin
Keyword(s):  
Control System ◽  
Underwater Acoustic ◽  
Acoustic Control

Piezoelectric Composite Panels for Underwater Acoustic Control

1995 ◽  
Author(s):  
Richard L. Gentilman ◽  
Leslie J. Bowen ◽  
Robert D. Corsaro ◽  
Brian H. Houston
Keyword(s):  
Lead Zirconate Titanate ◽  
Active Surface ◽  
Lead Zirconate ◽  
Piezoelectric Composite ◽  
Naval Research ◽  
Large Area ◽  
Sensor Actuator ◽  
Surface Control ◽  
Acoustic Control ◽  
Good Agreement

Abstract Large area 1–3 composite piezoelectric transducer panels have been produced by Materials Systems Inc. (MSI). These SonoPanels™ measure 250 × 250 mm and have excellent response as underwater actuators as well as sensors. Piezocomposite panel manufacturing has been facilitated by an injection molding technology for fabricating net-shape lead zirconate titanate (PZT) ceramic preforms. An array of fifteen 250 × 250 mm 1–3 composite actuator panels, integrated with surface mounted pressure and velocity sensors, has been attached to a steel backing structure. The array has been evaluated for underwater active surface control applications at the Naval Research Laboratory. Sensor-actuator coupling was investigated, with good agreement between calculated and measured performance.

The Study and Implementation of the Anti-Doppler Technology of AUV Communication System

2014 ◽  
Vol 536-537 ◽  
pp. 999-1004
Author(s):  
Ji Gang Dong ◽  
Da Jun Sun ◽  
Wei Wei Fan
Keyword(s):  
Frequency Shift ◽  
Communication System ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Underwater Acoustic Communication ◽  
Underwater Acoustic ◽  
Acoustic Control ◽  
Shift Keying ◽  
Pair Method ◽  
On Chip

Due to the complexity of the underwater acoustic channel, a reliable mobile underwater acoustic communication system must have high resistance to Doppler and multi-path extension. In this paper, an AUV underwater acoustic control and communication system based on frequency-hopping frequency-shift keying (FH-FSK) is proposed. The system uses pulse pair method to estimate Doppler frequency shift, and analyzes the performance of the algorithm via simulation. The system has been developed based on chip OMAP-L138, with lake test conducted. Result of the tests shows that the system can estimate and compensate the Doppler frequency shift generated by the platform's movement precisely, and has strong resistance to interference to transmit AUV control messages effectively.

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