Active Sonar Target Simulator Signal Processing Technology Research

With the world's desire for marine resources and the intelligentize development of underwater military equipment,multi-platform sonar cooperative detection has become more and more popular in underwater acoustic research since it more and more difficult were found in submarine detection with passive sonar.With the continuous development of underwater equipment and weapons platforms stealth technology,and the active sonar of receiver automatically exposes its position,so the multistatic system with flexible concealment is preferred.Based on the research of multistatic sonar system,a hardware platform based on OMAP-L138 and the software platform ARK-3510 of embedded computer are designed to construct a sonar target simulator.The completion of the base co-detection test.In this thesis,the main work are the overall design of the target simulator,study of signal processing related to the target simulator,and realization of the algorithm on the hardware platform,with respect to a multistatic sonar system.Firstly,we designed the target simulator experimental device from the multistatic working system,which mainly includes the functional design and parameter requirements of the target simulator.The multistatic test requires the target simulator to re-transmit the sound source signal in real time and fidelity,and at the same time clear the delay caused by the simulator signal detection,and give a simulator working mode of double-collection and single-forwarding.The target characteristic parameters are analyzed and proved on the whole,especially the range of the detection system and the accuracy of the range of the target parameters are calculated to ensure that the simulator specifications can meet the needs of the multistatic test.Secondly,the process of target simulator signal processing is analyzed,and the process of receiving,processing and forwarding of active sonar is analyzed from target simulator.The receiver detects the received signal of the hydrophone of the simulator and analyzes whether there is a detection signal from the active sonar,and then re-transmits the received signal in the next signal cycle.That realized the purpose of the target simulator to simulate the underwater real goal.At the same time,the theoretical analysis of target strength value setting under multistatic condition is made,which can make the simulator simulate the underwater target effectively and effectively.Finally,the algorithm is implemented on an embedded Linux system software platform,and designed the overall structure.Simultaneous operation of network and serialcommunication and data processing module is realized by multi-process control.And saved simulator receives data and working state information.It is applied to multi-platform cooperative detection of sea trials and selected some experimental data for processing,which verifies the function of target simulator.