The Surveillance Signal Detection And Confirm Method For Acoustic Fuze

Weak signal detection in the sea ambient noise background is an important research field of underwater signal processing, and it has wide applications in the aspects of underwater target's detection and recognition, underwater acoustic communication, remote control, telemetry, and ocean exploration, etc. For the acoustic fuze, the special demand is to get available signal detecton performance of low signal to noise ratio. And the signal detection method is simple in equipment, low in calculation amount and power consumption.The acoustic characteristics of the underwater target and the sea noise are discussed.The difference between the sea noise and the target noise is used to detect the target signal in the strong interference. In this paper,the waves of the signal and the sea noise have been reconstructed and simulated which can be used in the study of signal detecting method .On the other hand ,based on the development of signal detection and processing theories in the last twenty years,this paper studied the traditional signal processing methods ,including energy detection,power spectrum,zero crossing detection,and modern signal processing methods, including morden power spectrum ,high-order statistic etc.All this means is available in acoustic fuze application.The main contents of this dissertation are as follows:1. Sub marine ,surface ship and torpedo is good underwater sound source,but because of the development of the concealment, the noise of the submarines become less and less.Making use of the ship-radiated noise,the passive detector can detect the signal source.Ship-radiated noise is the signal source of the passive acoustic fuze.The wide-band acoustic character of ship-radiated noise can be used to wide-band engery detection of fuze and the calculation of the wide-band radiated acoustic power,It is important to get the acoustic source lever of target.2. Based on the analysis of the acoustic characters of the underwater targets, this paper discussed the method of target noise waveforms which can be used for research of target's signal detection .3. Reseached the surveillance detection method which is important to the passive acoustic fuze ,because it is active for a long time by using battery power supply ,and with high detection probability and low false alarm probability.In this paper ,we introduce three methods , energy detection,power spectrum detection and zero crossing...