宽带声学多普勒流速剖面仪的中频正交采样算法  

The quadrature sampling method for broadband acoustic Doppler current profile

作　　者：彭东立[1] 马海涛[1] 许伟杰[1] 

机构地区：[1]中国科学院声学研究所东海研究站,上海200032

出　　处：《声学技术》2013年第1期15-18,共4页Technical Acoustics

摘　　要：宽带声学多普勒流速剖面仪(Broadband Acoustic Doppler Current Profile,BBADCP)发射由伪随机编码调制的正弦信号,信号带宽在频域上产生展宽,成为带通信号。宽带回波信号的处理多采用正交解调的方法,但此方法对采样率的要求较高,硬件较难实现。利用数字中频正交采样法来实现,大大降低了采样频率,并且针对BBADCP解模糊速度的要求,进行了宽带回波信号的仿真试验,结果证明插值的数字中频正交采样法适合于BBADCP的信号处理。The signal transmitted by Broadband Acoustic Doppler Current Profiler is a kind of pseudo-random coding signal. The impulse signal is a broadband signal due to frequency spectrum spreading. The reverberation signal of BBADCP is processed with quadrature demodulation, while it is difficult to realize because of the required high sam- piing rate. Digital quadrature sampling of intermediate frequency （IF） signal is used to decrease the sampling rate. Ac- cording to the requirement of resolving the ambiguity velocity, the broadband reverberation signal is simulated to cal- culate the velocity of current. The result verifies that the proposed method is appropriate to signal processing of BBADCP.

关 键 词：声学多普勒流速剖面仪 中频正交采样 模糊速度 复协方差算法 

分 类 号：TN911.7[电子电信—通信与信息系统]