Study on the law of single-tone interference effect in unmanned aerial vehicle data links
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摘要: 针对战场环境中无人机数据链容易受到单音干扰影响而导致帧同步失败的现象，以直接序列扩频型数据链为研究对象，通过对干扰机理的分析，针对干扰的前门耦合效应，建立带内单源单音干扰和双源双音干扰两种典型场景中的失锁阈值模型，为了验证模型的有效性，以某型无人机数据链为试验对象，采用电磁干扰注入的方式开展了单源和双源干扰注入的效应试验，得到了不同干扰的失锁阈值，试验结果表明：失锁阈值的理论值与试验值变化趋势一致，验证了模型的有效性，该模型能够为试验设计提供理论依据。最后，研究了单源和双源干扰对数据链的效应规律，得到了单源干扰失锁阈值随工作信号功率、干扰频率的变化趋势，和失锁时双源干扰中干扰1功率随工作信号功率、干扰1频率、干扰2功率和频率的变化趋势。Abstract: Aiming at the phenomenon that unmanned aerial vehicle (UAV) data links in the battlefield environment are easily affected by electromagnetic interference (EMI) and lead to frame synchronization failure, this paper takes the Direct Sequence Spread Spectrum (DSSS) type data link as the research object. Through mechanistic analysis of interference, and specifically addressing the front-door coupling effect of such interference, loss-of-lock threshold models for two typical interference scenarios, in-band single-source single-tone and dual-source dual-tone interferences, are proposed. To validate the effectiveness of the model, taking a certain type of UAV data link as the test object, EMI injection tests are conducted for both single-source and dual-source interference scenarios. The loss-of-lock thresholds of different interferences are obtained. The results demonstrate that the theoretical values of the loss-of-lock threshold align with the experimental trends, thereby verifying the model's validity. These models can provide a theoretical b1asis for experimental design. Finally, the impact patterns of single-source and dual-source interference on the data link are investigated. The study reveals: the trends of the single-source interference loss-of-lock thresholds with the working signal power and interference frequency, and the powers of interference 1 at loss-of-lock status in dual-source interferences with the working signal power, interference 1 frequency, and interference 2 power and frequency.
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图 3 不同工作信号功率下单源单音干扰失锁阈值
Figure 3. Loss-of-lock threshold for single-source single tone interference at different operating signal powers
图 4 不同
$\Delta {f_1}$ 下单源单音干扰失锁干信比Figure 4. Loss-of-lock interference-to-signal ratio for single-source single-tone interference at different
$\Delta {f_1}$ 
图 5 失锁时不同干扰2功率下干扰1的功率
Figure 5. Power of interference 1 for different interference 2 powers at loss-of-lock
图 6 失锁时不同工作信号功率下干扰1的功率（干扰2固定）
Figure 6. Power of interference 1 for different operating signal powers at loss-of-lock (interference 2 fixed)
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