通用型高频宽带ADCP信号处理系统设计与实现

文章介绍了一种高频采集、数字解调滤波的通用型高频宽带声学多普勒流速剖面仪(Acoustic Doppler Current Profilers,ADCP)信号处理系统的设计和实现过程。该系统以现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)+数字信号处理器(Digital Signal Processor,DSP)+低功耗单片机(Mixed Signal Processor 430,MSP430)为架构平台,利用三者在信号处理领域的不同优势,采用软硬件协同设计的方式,解决了高频ADCP高采样率、高数据处理能力及低功耗的应用需求,在保证数据处理速度的基础上实现了相位的严格正交,且通过参数化配置实现了多频段、多功能的通用性设计,可适用于不同频段的走航式及自容式ADCP中。经湖上试验验证,该系统测速精度高,性能稳定可靠,达到了预期的设计指标。该系统的软硬件划分方式对其他高频海洋设备的研制具有一定的参考价值。

Design and implementation of universal high frequency broadband ADCP signal processing system

In this paper, the design and implementation of a universal broadband ADCP (Acoustic Doppler Current Profilers) signal processing system with functions of high frequency acquisition, digital demodulation and filtering is introduced. By taking FPGA (Field Programmable Gate Array)+DSP (Digital Signal Processor)+MSP430 (Mixed Signal Processor 430) as the architecture platform, the system utilizes the different advantages of these three chips in signal processing and adopts the way of hardware and software co-design to meet the application requirements of high frequency ADCP, such as high sampling rate, high data processing ability and low power consumption. The system realizes strict orthogonal phases on the basis of ensuring data processing speed, and realizes the multi-band and multi-functional usability design through parametric configuration, which can be applied to the vessel-mounted and the self-contained ADCP in different frequency bands. Experiments on the Lake show that the system has high accuracy, stable and reliable performance, and achieves the expected design targets. The hardware and software partitioning method of the system has a certain reference value for the development of other high frequency marine equipment.