In order to meet the requirement of timing control in cold atom interference experiments,a laser timing control DDS system based on LabVIEW software is designed and realized.The working process is the frequency and frequency interval of the software input through LabVIEW.According to LabVIEW software to send control information to control the RF signal chip,CPLD chip to control the time interval between the RF signal,the final DDS chip and control information corresponding to the RF signal.Compared with the current similar devices,the system to achieve the frequency hopping time and frequency more accurate and better stability.After debugging and analysis of the system and performance testing,DDS frequency hopping system can meet the atomic interferometer laser timing control needs.By testing the DDS device,the DDS device can output an accurate output RF frequency value,and the RF frequency time interval can be accurate to microseconds.The DDS device can effectively control the laser timing of the cold atom interferometer.When the probing time is 120 ms and the repetition rate is 2.2 Hz,the gravity measurement sensitivity of the cold atomic gravimeter is 1 × 10-7 g/Hz1/2.%为了满足冷原子干涉实验对时序控制的需求,设计并实现了一个基于LabVIEW软件的激光时序控制DDS系统,其工作过程为通过设计的LabVIEW上位机软件输入需要产生的频率和频率间隔时间,ARM芯片根据LabVIEW软件发送来的控制信息实现对射频信号芯片的控制,CPLD芯片用来控制射频信号之间的时间间隔,最后DDS芯片产生与控制信息相对应的射频信号;与目前同类装置相比,系统实现了跳频时间和频率更加精确和工作稳定性更好;经过系统的调试分析以及性能测试,DDS跳频系统能够满足原子干涉仪激光时序控制需求;通过测试DDS装置,DDS装置能够输出准确输出射频频率值,并且射频频率时间间隔能精确到微秒.DDS装置可以有效控制冷原子干涉仪的激光时序,在探询时间为120毫秒且重复率为2.2赫兹的情况下,冷原子重力仪的重力测量灵敏度达到1.0×10-7 g/Hz1/2.
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