Research On Weak Signal Detection Based On Liu-cos Chaos System

There is a vast resource space in the Marine environment,which will inevitably lead to competition among countries for Marine resources.At the same time,with the rapid development of China's oceans,the need for Marine telecommunication technology is more and more urgent.Therefore,the development of highly sensitive anti-interference underwater acoustic communication technology has important and practical significance both in the military and civil aspects.Weak signal detection based on the chaotic system,because it has good noise immunity,and the sensitivity of the chaotic system of weak signal with a strong,the main research content of this article is as follows:First Duffing chaotic system of traditional theoretical analysis and formula derivation,and the chaos of weak signal detection performance is analyzed,and by using the MATLAB simulation results verify the effectiveness of the theoretical part is derived as a result,after summarized the use of traditional Duffing system for weak signal detection has only narrow domain and its major period state is not the main problem of the convergence.And then put forward by using three dimensional Liu-cos chaos system for weak signal detection,and through theoretical derivation found Liu-cos for weak signal detection with wide mergence and chaotic systems when the input of the same frequency acoustic signal amplitude is greater than the critical threshold,the system state variable output balance in the cycle of input signal disturbing force,the system state variables and the output converges to zero,namely Liu-cos chaotic system has the convergence state;After Liu-cos the weak signal detection performance of the system and Duffing system MATLAB simulation analysis,including convergence,wide area detection,detection of different envelope signal,noise immunity and detectable signal frequency and phase Angle of precision.Finally,the circuit design of Liu-cos system was carried out,and the circuit simulation experiment was carried out to verify its good performance.Set the underwater acoustic communication experiment platform,Liu-cos chaotic system through small pools simulated ocean environment,for weak signal detection,Liu-cos systems for the future in the application of underwater acoustic communication laid a good foundation;Then,the acoustic communication experiment was carried out for Liu-cos system,which proved that Liu-cos chaotic system could detect the airborne acoustic signal.Finally based on Liu-cos chaotic systems and weak signal detection of Duffing chaotic system performance comparison experiment,the experimental results show that Liu-cos chaotic systems with good performance,can replace the traditional Duffing chaotic system,the future Liu-cos chaos system can be applied in practical underwater acoustic detection of weak signals.