水下高速航行体主动声呐回波数据处理研究

摘要

根据水下高速航行体运动特点,建立了航行体的俯仰运动模型,结合运动学模型和多普勒频移公式建立了基于CW波的航行体回波理论,数值模拟分析了各种速度条件下的回波信号曲线;采用短时傅里叶变换对回波信号曲线进行时频分析,计算了回波信号的频率参数,数值计算结果与弹道速度曲线进行了比较,验证了短时傅里叶变换在工程运用上的可行性.研究结果为高速航行体的主动声呐速度测量技术提供技术支持.%According to the characteristics of underwater high-speed target movement,the pitch movement model of the aircraft body is established.Based on the kinematic model and the Doppler frequency shift formula,the theory and simulation model of the aeronautical echo based on long Continuous Wave is established.The echo signal curves of various speed conditions are simulated and analyzed.The timefrequency analysis of the echo model is carried out by using STFT.The frequency of the echo signal is calculated.Comparing the simulation model with the numerical model,the feasibihty of the STFT in engineering application is proved.The results provide technical support for the active sonar velocity measurement technology of underwater high speed airplane.