Prediction of Third-order Intermodulation Effects from Out-of-band Electromagnetic Interference in UAV Data Links

ZHANG Xiaolu; ZHAO Min; CHEN Yazhou

doi:10.12382/bgxb.2025.0138

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Prediction of Third-order Intermodulation Effects from Out-of-band Electromagnetic Interference in UAV Data Links

更新时间：2026-04-24

- Prediction of Third-order Intermodulation Effects from Out-of-band Electromagnetic Interference in UAV Data Links
- Acta Armamentarii Vol. 47, Issue 1, Pages: 250138(2026)
- 作者机构：
  
  陆军工程大学石家庄校区电磁环境效应重点实验室，河北石家庄 050003
- 作者简介：
- 基金信息：
- DOI：10.12382/bgxb.2025.0138
  CLC： TN972
- Received：03 March 2025，
  
  Online First：11 February 2026，
  
  Published：31 January 2026
- 稿件说明：
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ZHANG Xiaolu, ZHAO Min, CHEN Yazhou. Prediction of Third-order Intermodulation Effects from Out-of-band Electromagnetic Interference in UAV Data Links[J]. Acta Armamentarii, 2026, 47(1): 250138.
DOI：

ZHANG Xiaolu, ZHAO Min, CHEN Yazhou. Prediction of Third-order Intermodulation Effects from Out-of-band Electromagnetic Interference in UAV Data Links[J]. Acta Armamentarii, 2026, 47(1): 250138. DOI： 10.12382/bgxb.2025.0138.

摘要

针对无人机复杂电磁环境效应预测的军事需求，以直接序列扩频型无人机数据链为研究对象，基于3阶互调效应机理分析，引入无人机数据链带外电磁干扰3阶互调效应因子与效应指数，提出一种无人机数据链带外电磁干扰3阶互调效应预测模型。将理论推导与效应试验相结合，给出效应因子的测定方法，并开展双源带外干扰注入的3阶互调效应试验，获得数据链带外频点的效应因子。为验证模型的有效性，开展双源与三源带外干扰注入的效应指数试验。分析结果表明：正频偏效应因子最大值为142. 89，负频偏效应因子最大值为54. 52，负频偏端拥有更强的抗3阶互调干扰能力；效应指数的试验结果与理论预测的误差小于1. 41 dB，验证了新模型的准确性，为抗干扰策略的优化设计提供了理论依据。

Abstract

To address the military demand for the prediction of complex electromagnetic environment effects of unmanned aerial vehicle (UAV) data links

a prediction model of third-order intermodulation (IM3) effects from out-of-band electromagnetic interference (EMI) in UAV data links is proposed. The model focuses on the direct sequence spread spectrum (DSSS)-based UAV data links and introduces the IM3 effect factor and effect index of the out-of-band EMI based on the analysis of IM3 effect mechanism. A measurement method for the effect factor is established by integrating theoretical derivation and effect experiment

and IM3 effect experiments of dual-source out-of-band interference injection are used to obtain the effect factor at out-of-band frequency point. The effect indexes of dual-source and three-source out-of-band interference injections are tested to validate the model. The results show that the peak effect factor at positive frequency offsets reaches 142. 89

while that at negative frequency offsets is 54. 52

demonstrating a stronger resistance to IM3 interference on the negative frequency offset side. Furthermore

the deviation between the experimental and theoretical values of effect index is less than 1. 41 dB

validating the accuracy of the proposed model and providing theoretical support for optimizing the anti-interference strategies.

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references

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