Laws and Mechanism of Dual-frequency Insensitive Effect of Blocking Interference
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摘要: 该文通过引入幂级数展开式的5阶项对双频干扰下系统非线性失真进行分析，揭示了阻塞干扰产生双频钝感现象的本质原因，并进行了试验验证。理论分析与试验结果表明，当干扰信号强度较弱、系统非线性失真程度较低时，可用精确到3阶项的幂级数展开式描述其传递函数，此时受试装备对双频干扰场强的有效值敏感；随着干扰信号增强，系统非线性失真程度上升，幂级数展开式中的5阶项不可忽略，受试装备对双频干扰出现阻塞效应减弱现象；阻塞程度越高，双频阻塞减弱现象越严重。Abstract: By introducing the 5th-order term of power series expansion, the nonlinear distortion of the system under dual -frequency interference is analyzed, and the essential reason of dual-frequency insensitive effect caused by blocking interference is revealed, which is verified by experiments. Theoretical analysis and experimental results show that when the interference signal strength is weak and the nonlinear distortion of the system is low, the transfer function can be described by the power series expansion accurate to the 3rd-order term, and the test equipment is sensitive to the effective value of the dual -frequency interference field strength; with the increase of the interference signal, the nonlinear distortion of the system increases, and the 5th-order term in the power series expansion cannot be ignored, and the higher the blocking degree is, the more serious the dual-frequency insensitive effect is.
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表 1 以峰值电平压缩1.5 dB为敏感判据试验结果
Ei/Ei0 Δf1= 0 Hz 0.84 0.72 0.66 0.60 Δf2 =90 MHz 0.56 0.72 0.78 0.82 R 1.02 1.03 1.03 1.04 Δf1= –150 MHz 0.88 0.76 0.66 0.53 Δf2 =150 MHz 0.47 0.65 0.78 0.85 R 1.00 1.00 1.04 1.01 
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表 2 以峰值电平压缩6 dB为敏感判据试验结果
Ei/Ei0 Δf1= 0 Hz 1.09 0.87 0.77 0.68 Δf2 =90 MHz 0.72 0.77 0.83 0.90 R 1.71 1.35 1.29 1.27 Δf1= –150 MHz 0.89 0.80 0.70 0.62 Δf2 =150 MHz 0.66 0.80 0.85 0.89 R 1.24 1.28 1.21 1.18
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表 3 以峰值电平压缩12 dB为敏感判据试验结果
Ei/Ei0 Δf1= 0 Hz 1.11 1.06 0.91 0.80 Δf2 =90 MHz 0.99 1.07 1.14 1.16 R 2.22 2.27 2.12 1.98 Δf1= –150 MHz 1.12 0.84 0.70 0.65 Δf2 =150 MHz 0.71 0.91 1.05 1.08 R 1.77 1.52 1.59 1.59
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表 4 单频临界干扰场强与选择系数比
峰值电平压缩量 单频临界干扰场强(dBV/m) A1/A2均值 6 dB 12 dB Δf1=0 Hz 5.43 11.18 1.90 Δf2=90 MHz 11.10 16.70 Δf1=–150 MHz 6.13 10.93 2.60 Δf2=150 MHz 14.26 19.99
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表 5 频偏0 Hz, 90 MHz双频干扰试验结果
Δf1=0 Hz Δf2=90 MHz 有效电平差
(V)峰值电平
压缩量(dB)干扰场强
(dBV/m)5.43 / / 5.99 / 11.10 / 5.98 –4.20 10.56 2.20 5.24 –2.20 10.24 1.78 5.07 0.60 9.34 0.90 4.78 4.30 4.81 1.38 4.99 干扰场强
(dBV/m)11.18 / / 12.01 / 16.70 / 11.96 3.80 15.84 3.25 10.15 5.80 15.23 2.07 9.58 6.80 14.74 1.30 9.30 8.80 12.94 0.80 9.13
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表 6 频偏–150MHz, 150 MHz双频干扰试验结果
Δf1=–150 MHz Δf2=150 MHz 有效电平差
(V)峰值电平
压缩量(dB)干扰场强
(dBV/m)6.13 / / 6.03 / 14.26 / 6.00 –2.20 13.71 2.79 5.21 0.80 12.85 1.49 5.04 2.30 11.99 0.52 4.93 5.30 5.95 2.90 5.08 干扰场强
(dBV/m)10.93 / / 11.96 / 19.99 / 11.95 3.80 19.06 5.01 9.90 5.80 18.40 3.39 9.74 8.40 16.44 0.19 9.56 10.00 12.83 2.94 9.71
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