一种声呐用多通道相控扫描信号源的设计

Design of multi-channel phase scanned signal source for sonar system

随着声呐技术的发展,基阵发射波形也多种多样。为了适应这种多样化的需求,设计了一种可编程的多通道相控扫描信号源。该信号源采用数字信号处理器(Digital Signal Processor,DSP)和现场可编程门阵列(Field-Programmable Gate Array,FPGA)结合的方式,应用DSP计算各个波束的波形数据及其各通道的延时,应用FPGA的精确延时形成各个波束。该设计指向精度高,可生成任意信号波形,任意配置波束组合,可下载并存储预成波形,对波形加窗函数,可实时对延时进行补偿和校准,并能够多个信号源协同工作。在实际应用中得到了成功验证,具有很大的改进潜力和广阔的应用前景。

With the development of sonar technology, transmitting array signal become more diverse. In order to meet the diversified demands, a programmable multi-channel phase scanned signal source is designed, which is based on using a combination of DSP and FPGA. The DSP calculates the waveform data of each beam and the delay of each channel. The FPGA forms each beam based on accurate delays. This design has more precise directivity, can generate arbitrary signal waveforms and arbitrary beam compositions, can download and store pre-waveform, can generate waveform data multiplied by window function, and can compensate and calibrate delay in real-time. Group signal sources can be combined to achieve collaborative work. The results of practical application demonstrate that the design of signal source has great improvement potential and broad application prospect.