Continuous Waveform Design And Target Tracking In Distributed Active Sonar

Not only the detection performance is majorly affected by the active sonar signal waveform,the signal processing method is also directly affected as well,meanwhile,in order to improve tracking performance,it needs to achieve high refresh rate tracking to ensure continuous tracking track when the active sonar tracks the target of high-speed motion.That is why this thesis takes this as the starting point,achieves the purpose of improving the target tracking refresh rate and obtaining the continuous robust tracking results through designing the waveform under the underwater network detection,and processing the active sonar signal.Firstly,the design of Underwater network detection sonar signal waveforms is studied.The methods and principles of waveform form and parameter selections are given based on the design methods of active sonar signal waveform.The continuous wave waveform is selected as the active sonar signal form here from the perspective of data refresh rate and continuous and robust tracking in addition.Secondly,the continuous wave waveform optimized design of underwater network multi-base detection is studied combined with the time-sharing processing characteristics of the continuous wave signal system and based on the detection performance.Time-sharing processing method for Pulsed Active Sonar(PAS)and Continuous Active Sonar(CAS)signals are discussed.The performance of PAS signal and CAS signal in detection is comprehensively compared.The relationship between signal processing gain and target refresh rate of CAS system is discussed.To improve the gain of the time-sharing process from the perspective of the signal waveform,the introduction of Generalized Sinusoidal Frequency Modulated(GSFM)signals is improved in view of the shortcomings in the detection of CAS signals.Better detection performance is obtained while ensuring the high refresh rate,which is beneficial to subsequent tracking of the target.Finally,the target tracking method and performance of continuous wave active signal detection in network are studied aiming at the characteristics of continuous wave acoustic signal and time-sharing processing.The single target and multi-target are tracked after time-sharing processing using the continuous wave signal,and the advantages of continuous wave signal in tracking are simulated and analyzed,the target refresh rate is improved,the target position error in the tracking process is reduced,and the criteria for selecting the minimum time-series pulse width are given.The verification of the test data proves that the continuous wave signal can obtain continuous and stable tracking results after time-division processing,which achieves the purpose of this thesis.