Simulation Of Acoustic Homing In Short Range

In shallow water, low cost anti-submarine weapon will play more and more important role in modern combat. Entrusted with the homing function, it will be promoted to be one kind of precise homing weapon. This dissertation mainly studies the homing system of the low cost homing anti-submarine weapon.The homing system of LCHAW (Low Cost Homing ASW Weapon) uses active exploration mode. It can detect the target by processing the received echo signals, and target parameters will also be estimated. The instruction installation outputs the LCHAW's manipulation instructions according to the relevant information provided by receiver, and the target will be tracked. When the active homing system works, the reverberation is the main interference. With the development of signal processing technique, it presented a wide range of anti-reverberation methods, but they don't suit the LCHAW.A modern signal processing technique is proposed in this dissertation which suits LCHAW. The noise added to echo signal is filtered by adaptive Notch filter, and the normalized weight coefficients are calculated real time. The reverberation is suppressed which is advantaged to improve the ability of detection for homing system. The anti-reverberation technology is simple, convenient and reliable. In the aspect of target parameters estimation, the signal detection, target distance estimation, the position estimate and the frequency estimate are realized by using two adaptive Notch filters which base on the LMS (least mean square) arithmetic.According to the results of the real data processing, it is concluded that the signal processing technology is simple, convenient and effective; the reverberation is well suppressed; and the functions and indicators of the LCHAW's homing system are realized.