摘要
阵列信号采集系统一般具有采集速率高、数据量大的特点,且要求各个阵元间幅度和相位一致性好,设计了一种基于FPGA+DSP架构的阵列信号数据采集装置,配合上位机软件可分析通道间幅相一致性。该系统结合DSP浮点运算能力强以及FPGA管脚资源丰富的优势,搭载高速AD转换器,配合高灵敏度继电器组成的开关矩阵,可最大限度完成128路阵列信号的分时同步采集,既扩展了可测试的最大阵列数,又保证了幅相一致性指标。同时采用高速传输的USB芯片,完成与工控机之间的通信,实现大数据量高速传输功能。经实验证明,系统可实现对128路阵列信号的采集与传输,通道间幅度一致性优于±1 dB、相位一致性优于±3°。
Array signal acquisition system generally has the characteristics of high acquisition rate and large amount of data,and requires good amplitude and phase consistency between each array element.In this paper,an array signal data acquisition device based on FPGA+DSP architecture is designed,and amplitude and phase consistency between channels can be analyzed with host computer software.Combined with the advantages of strong DSP floating point operation ability and abundant FPGA pin resources,the system is equipped with a high-speed AD converter and a switch matrix composed of a high sensitivity relay,which can maximize the time-sharing and synchronous acquisition of 128-channel array signals,expanding the maximum number of arrays that can be tested and ensuring the index of amplitude and phase consistency.At the same time,the high-speed transmission USB chip is adopted to complete the communication with industrial personal computer and realize the high-speed transmission function of large amount of data.The experiment shows that the system can realize the acquisition and transmission of 128-channel array signals,and the amplitude consistency between channels is better than±1 dB and the phase consistency is better than±3°.
作者
张雨
王钢
裴君妍
Zhang Yu;Wang Gang;Pei Junyan(Changchun Institute of Optics,Fine Mechanics,and physics,Chinese Academy of Science,Changchun 130033,China)
出处
《电子测量技术》
2020年第8期169-174,共6页
Electronic Measurement Technology
