摘要
多普勒效应对主动声纳接收信号的根本影响是接收信号相对发射信号的时间延迟和尺度伸缩。在宽带信号体制下对高速运动目标进行参数估计时,利用传统的窄带信号模型会产生模糊,必须采用时间尺度域模型,即利用接收信号和发射信号的相关性实现运动目标距离和速度的估计。宽带信号模型计算量大,计算时间长。希尔伯特-黄变换具有较高的频率分辨率,利用希尔伯特-黄变换对信号进行频率预估计,减小时间尺度域二维扫描的区域和运算量。在DSP硬件平台上实现希尔伯特-黄变换有关算法。
Compared to the transmit signal,the ultimate effect of Doppler domino effect to the receive signal of active sonar is time delay and scale flex.The traditional method based on narrow-band signal model is disabled on the distance and speed estimation of the under-water high speed target,and the method based on time and scale must be used.The correlation of the receive signal and the transmit signal is used to estimate the distance and speed of the motional target.However,the count amount of the method based on the wide-band signal is excessive and the count time is too much long.As the HHT has a perfect capability of frequency analyses,frequency estimation based on HHT is used to reduce two-dimensional scan area and operation amount of the time-scale.The HHT arithmetic is actualized on the hardware of DSP.
出处
《船电技术》
2011年第1期51-55,共5页
Marine Electric & Electronic Engineering
关键词
宽带信号
希尔伯特-黄变换
频率估计
wide-band signal
Hilbert-Huang transform
frequency estimation
