高阶非线性失真双频阻塞干扰规律

doi:10.12305/j.issn.1001-506X.2022.01.07

摘要/Abstract

摘要：

为掌握用频装备电磁辐射效应规律, 提高其电磁防护能力, 首先从理论上分析了高阶非线性失真条件下双频阻塞干扰规律, 而后以某型频率步进连续波雷达为受试设备开展试验, 对干扰规律进行验证与补充。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, 可用精确到三阶项的幂级数展开式描述其传递函数, 此时受试设备对双频干扰场强的有效值敏感; 随着干扰信号增强, 高阶的非线性失真不可忽略, 出现了双频阻塞干扰效果减弱的阶段。上述规律为提高装备电磁防护能力提供了理论支撑。

关键词: 非线性失真, 阻塞干扰, 双频, 频率步进连续波雷达, 幂级数展开式

Abstract:

In order to master the laws of electromagnetic radiation effect of frequency equipment, the dual frequency blocking interference laws under the condition of high-order nonlinear distortion is theoretically explored firstly. Then, the test is carried out with a frequency stepped continuous wave radar to verify and supplement the interference laws. The results show that when the intensity of the interference signal is weak and the nonlinear distortion of the system is low, the transfer function can be described by the power series expansion which is accurate to the 3rd term. At this time, the test equipment is sensitive to the effective value of the dual frequency interference field strength. With the enhancement of the interference signal, the higher-order nonlinear distortion cannot be ignored, and the dual frequency blocking interference effect is weakened in a certain stage. The above laws provide theoretical support for improving the electromagnetic protection of equipment.

Key words: nonlinear distortion, blocking interference, dual frequency, stepped frequency continuous wave radar, power series expansion

中图分类号:

赵凯, 魏光辉. 高阶非线性失真双频阻塞干扰规律[J]. 系统工程与电子技术, 2022, 44(1): 47-53.

Kai ZHAO, Guanghui WEI. Dual frequency blocking interference laws with high order nonlinear distortion[J]. Systems Engineering and Electronics, 2022, 44(1): 47-53.

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干扰频偏	归一化临界干扰场强幅值E_i/E_i0
Δf₁=-30 MHz	0.86	0.77	0.65
Δf₂=30 MHz	0.55	0.70	0.77
效应指数R	1.02	1.03	1.03
Δf₁=-150 MHz	0.88	0.76	0.66
Δf₂=150 MHz	0.47	0.65	0.78
效应指数R	1.00	1.00	1.04

干扰频偏	归一化临界干扰场强幅值E_i/E_i0
Δf₁=-30 MHz	0.89	0.80	0.71
Δf₂=30 MHz	0.75	0.88	0.92
效应指数R	1.36	1.41	1.35
Δf₁=-150 MHz	0.89	0.80	0.70
Δf₂=150 MHz	0.66	0.80	0.85
效应指数R	1.24	1.28	1.21

干扰频偏	归一化临界干扰场强幅值E_i/E_i0
Δf₁=-30 MHz	1.15	1.08	0.81
Δf₂=30 MHz	1.03	1.13	1.16
效应指数R	2.38	2.45	1.99
Δf₁=-150 MHz	1.12	0.84	0.70
Δf₂=150 MHz	0.71	0.91	1.05
效应指数R	1.77	1.52	1.59

峰值电平压缩量	单频临界干扰场强/(dBV/m)
峰值电平压缩量	1.5 dB	6 dB	12 dB	均值
Δf₁=-30 MHz	-1.63	4.00	9.70	—
Δf₂=30 MHz	0.90	6.69	12.05	—
选择系数比A₁/A₂	1.34	1.36	1.31	1.34
Δf₁=-150 MHz	-0.20	6.13	10.93	—
Δf₂=150 MHz	8.00	14.26	19.99	—
选择系数比A₁/A₂	2.57	2.55	2.84	2.65

干扰场强/(dBmV/m)		有效电平差/V	峰值电平压缩量/dB
Δf₁=-30 MHz	Δf₂=30 MHz	有效电平差/V	峰值电平压缩量/dB
4.00	—	—	5.92
—	6.69	—	5.84
-5.20	6.07	1.28	5.04
-3.20	5.72	1.00	5.08
-1.20	5.09	0.63	4.80
0.80	3.85	0.09	4.63
2.80	0.67	0.77	4.99
9.70	—	4.09	11.96
—	12.05	4.00	12.03
2.80	11.13	1.75	9.95
4.80	10.40	0.98	9.08
6.80	8.92	0.14	8.78
8.80	4.43	2.03	10.21