Electromagnetic Environment Complex Evaluation Algorithm Based on Fast S-transform and Time-frequency Space Model
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摘要:
针对复杂电磁环境电磁干扰复杂度定性与定量评估问题,该文提出一种基于快速S变换时频空间模型的复杂度评估方法。利用快速S变换方法同步提取时域占用度、频域占用度和能量占用度等评估指标,给出了具体计算方法。在此基础上建立快速S变换时频空间评估模型,将时域、频域和能量域3维向量的F范数和均方根作为电磁环境主观复杂度和客观复杂度评估指标,克服了传统电磁干扰复杂度评估独立参数定级不能全面反映电磁干扰整体特性的局限性。仿真结果表明,采用该模型能有效同步提取时频及能量评估特征参数,时频空间评估模型能精确反映整体电磁干扰特征;实验测试结果验证了本文所提评估方法的正确性。
Abstract:For qualitative and quantitative complex evaluation problem of electromagnetic environment. This paper proposes a novel electromagnetic environment complex evaluation algorithm based on fast S-transform and time-frequency space model, which can count time-complex, frequency-complex and energy-complex simultaneously. Meanwhile, the computation methods and concept of qualitative and quantitative evaluation degree are introduced. To overcome the limitations of the traditional methods, F-norm and root-mean-square are selected as two important evaluation indicators, which have the advantage in accurate evaluation. Simulation results show that the proposed method is accurate and effective to reflect the intensity degree of electromagnetic interference; Meanwhile, the interference experiment of bus card confirms the correctness of the time-frequency space model. The experimental test results verify the correctness of the mentioned evaluators.
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表 1 传统电磁环境复杂度的定级标准(%)
定性等级 定量等级 时间 频率 空域 一般复杂 1 0~10 0~10 0~10 2 10~20 10~20 10~20 3 20~30 20~30 20~30 轻度复杂 4 30~40 30~40 30~40 5 40~50 40~50 40~50 中度复杂 6 50~60 50~60 50~60 7 60~70 60~70 60~70 8 70~80 70~80 70~80 重度复杂 9 80~90 80~90 80~90 10 90~100 90~100 90~100 表 2 本文电磁环境复杂度的定级标准(%)
定性等级 定量等级 客观复杂度C 主观复杂度Cm 一般复杂 1 0 < C ≤ 0.1 Cm ≥ 2.7 2 0.1 < C ≤ 0.8 2.7 > Cm ≥ 2.4 3 0.8 < C ≤ 2.7 2.4 > Cm ≥ 2.1 轻度复杂 4 2.7 < C ≤ 6.4 2.1 > Cm ≥ 1.8 5 6.4 < C ≤ 12.5 1.8 > Cm ≥ 1.5 中度复杂 6 12.5 < C ≤ 21.6 1.5 > Cm ≥ 1.2 7 21.6 < C ≤ 34.3 1.2 > Cm ≥ 0.9 8 34.3 < C ≤ 51.2 0.9 > Cm ≥ 0.6 重度复杂 9 51.2 < C ≤ 72.9 0.6 > Cm ≥ 0.3 10 72.9 < C ≤ 100 0.3 > Cm 表 3 公交卡及电磁干扰信号参数表
信号样式 信号时频能量参数 中心频率(MHz) 持续时间(s) 带宽(MHz) 接收功率(dB) 公交卡信号 13.56 60 1.25 –20 干扰信号1 13.56 60 0.70 –30 干扰信号2 高斯噪声(0~400) 60 0~400 –70 表 4 客观复杂度评估参数及定量评价结果
信号样式 信号时频能量占用度(%) C (%) TP FP EP 干扰1 100 56 30 16.8 干扰2 100 100 <0.01 <0.01 表 5 主观复杂度评估参数及定量评价结果
信号样式 S变换时频模型评估参数 Cm tP1 (s) tP2 (s) fP1 (MHz) fP2 (MHz) SP1 (dBm) SP2 (dBm) 干扰1 0~60 0~60 13.56 13.56 –20 –30 0.90 干扰2 0~60 0~60 13.56 0~400 –20 –70 0.01 -
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