| 摘要: |
| 在时分多址战术数据链通信系统中，端机发送延时抖动将造成时间同步精度下降。为解决该问题，提出了一种基于小数延时滤波器的时间同步方法。首先，使用硬件描述语言设计相位检测电路，以获取基带信号发送延时；然后，利用拉格朗日插值算法构造小数延时滤波器；接着，将相位检测电路与小数延时滤波器相结合，以补偿发送延时；最后，通过现场可编程门阵列对该方法进行实现，并搭建实物测试环境，验证所提方法的有效性。实验结果表明，该方法可有效解决发送延时抖动问题，时间同步精度提高了4.6 ns。 |
| 关键词: 战术数据链通信系统；时分多址（TDMA） 往返校时；时间同步；小数延时滤波器 |
| DOI：10.20079/j.issn.1001-893x.240408002 |
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| 基金项目: |
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| A Time Synchronization Method Based on Fractional Delay Filter |
| LI Chao |
| (Southwest China Institute of Electronic Technology,Chengdu 610036,China) |
| Abstract: |
| In the time division multiple access(TDMA) tactical data link communication system,the transmission delay jitter of terminal will result in the decrease of time synchronization accuracy.To solve this problem,a time synchronization method base on fractional delay filter is proposed.Firstly,the phase detection circuit is designed using hardware description language to obtain the baseband signal transmission delay.Then,the fractional delay filters are constructed by the Lagrange interpolation algorithm.After that,the phase detection circuit is combined with the fractional delay filters to compensate transmission delay.Finally,the method is implemented by field programmable gate array,and a real test environment is set up to verify the effectiveness of the proposed method.Experimental results show that this method can effectively solve the problem of transmission delay jitter and the time synchronization accuracy is improved by 4.6 ns. |
| Key words: tactical data link communication system time division multiple access(TDMA) round trip time time synchronization fractional delay filter |
