Research on Simulation of Long Towed Line Array' Port/Starboard Discrimination

Long towed line array is one of the most important modes of towed line array;the problem of port/starboard illegibility is one of the main disadvantages.Based on the near-field zone characters of long towed line array,the target function whose parameters are target' bearing and range was established according to the theory of time delay beam-forming.When the shape of long towed line array was linear,target function' grey-scale picture can be acquired through two dimensions search focusing on the parameters of bearing and range based on the frequency of target acquired through spectrum analysis.When the towed body turnes,the shape of long towed line array can be predicted based on the data of two course sensors which were installed at the bow and at the stern of the array.Then changing the target function,doing the two dimensions search and drawing the target function' grey-scale picture again,the target' bearing and illusive target' bearing can be discriminated according to the change of target function' grey-scale picture.Thus,a new method which can solve the problem of port/starboard discrimination of long towed line array was acquired.The simulation result shows that the changes of target function' grey-scale picture are obvious,and this method can solve the problem of port/starboard discrimination effectively.