The Computer Simulation Of Underwater Acoustic Array Signal Processing Based On Matched-Signal Phase Method

Principles of matched-signal phase method of noise and space correlative interference cancellation are presented by using three-sensor array and multi-sensor array in this thesis. Expressions of extracted signals in which noise and interference have been canceled are presented. In order to prove the validity of this method, computer simulations are carried out.Firstly, principles of matched-signal phase method of three-sensor array are introduced, then this method is applied to the cancellation of noise and space correlative interference. The theoretical analyses and results of computer simulations show that in the bandwidth of signal frequency, if there were no space correlative interference in received signal, the background noise could be canceled completely, signal could be exactly restored without any information about signal and background noise except for noise power matched; if there were no background noise in received signal, the interference could be canceled completely, interfered signal could be exactly restored without any information about signal and interference except for the arriving direction of signal; if there were both background noise and space correlative interference in received signal, the background noise and interference could be canceled effectively , interfered signal could be effectively restored without any information except for the arriving direction of signal.Secondly, principles of matched-signal phase method of beam region's three-sub-array based on multi-sensor array are introduced, then this method is applied to the cancellation of noise and space correlative interference too. The theoretical analyses and results of computer simulations show that the performances of three-sub-array are superior to that of three-sensor array.Thirdly, performances of matched-signal phase method of noise and space interference cancellation in conditions that will be encountered in applying this method to the engineering are roundly analyzed. These conditions include background noise, error of arriving direction of signal, distance between the twosensors, truncation of interference and the match degree of interference power spectra. The array gains of matched-signal phase method are analyzed particularly in this thesis as well as. The theoretical analyses and results of computer simulation show that performances of this method in canceling noise and space correlative interference are superior to conventional array signal processing method.Finally, the merits and demerits of matched-signal phase method are summarized.