宽带多普勒声呐回波模型及特性研究

分析了重复二相相位编码信号的特性,建立了海底回波模型,并推导了海底回波的自相关和功率谱表达式.研究表明海底回波自相关和功率谱为具有不同压缩因子的单元散射信号自相关函数的叠加,并且形状与发射信号基本相同,但是相对发射信号有一定的展宽和拉伸或压缩.利用湖试数据分析和数字仿真证明了理论分析的结论.

Study on Echo Model and Characteristics of Broadband Doppler Sonar

To increase accuracy further and study the characteristics of the echo,echo model is established,autocorrelation and power spectral of echo from bottom are induced.The results show that autocorrelation and power spectral of echo is the sum of autocorrelation of echo from each bottom cell with different compression factor.The autocorrelation and power spectral of echo from sea bottom are similar to the transmitted signal,but are widened and compressed or expanded.At last,analysis of lake experiment data and digital simulation prove the results.