摘要
为了用水下航行平台上的仰视声纳测量波浪,分析了水下航行的运动特点,提出了一种基于误差最小的频谱估计运动补偿算法,首先利用高通滤波处理,减少波浪频谱中由垂直起伏产生的低频影响;同时,采用小波变换多分辨分解的低频单支重构,获得波浪频谱的趋势化规则谱形;然后,利用迭代计算对波浪频谱寻优求解,减少其中由水平运动产生的多普勒频偏影响,获得航行测量数据的波浪估计谱,计算获得波高、频率等信息。模拟实验结果表明:运动补偿能有效改进测量准确性,补偿后的谱形与原始靶谱具有很好的一致性,可应用于拓展水下航行平台的测量功能。
To get the wave parameters from an up-looking sonar on a subsurface moving platform, a method by applying motion compensation algorithm to extract wave spectrum is proposed. Based on the analysis of underwater platform movement and linear wave theory, a high-pass filter is used to reduce the low frequency components induced by vertical platform fluctuations. The trend of wave spectrum is obtained based on wavelet decomposition and reconstruction by means of Symlet wavelet. Furthermore, the wave spectrum is estimated by searching strategy to explore the minimum distance between the measured wave spectrum and the iterated spectrum with Doppler frequency shift due to sailing contrary to wave propagation at the platform velocity. Meanwhile, the significant wave height and other parameters can be calculated from the wave spectrum. The simulation results indicate that the method improves the measuring accuracy and the estimated spectrum is in good agreement with the original wave spectrum. It can be used for extending versatility of underwater moving platforms.
出处
《传感器与微系统》
CSCD
北大核心
2009年第4期59-62,共4页
Transducer and Microsystem Technologies
关键词
波浪测量
波浪频谱
水下航行平台
仰视声纳
运动补偿
wave measurement
wave spectrum
underwater moving platform
up-looking sonar
motion compensation
