摘要
针对水下目标跟踪定位系统中信号的特点,采用自适应Notch滤波器对接收信号进行检测,使系统在低信噪比的情况下仍能保证较高的正确检测率。提出了用FPGA实现Notch滤波器的硬件电路方案,用DDS技术解决了Notch滤波器的正交参考源的输入问题,简化了系统的设计,提高了稳定性,同时保持了较高的检测正确率。
According to the signal characteristics of underwater target tracking and positioning system, the Adaptive Notch Filter which is used to detect receiving signal, can guarantee high correct rate of detection in low SNR. Using FPGA instead of DSP to implement hardware Notch filter is proposed, and DDS technology is used to solve the problem of the orthogonal reference source input for the Notch Filter. This method can not only simplify the system design and improve the stability, but also maintain high correct rate of detection.
出处
《声学技术》
CSCD
北大核心
2008年第2期275-278,共4页
Technical Acoustics
