Systems Engineering and Electronics ›› 2022, Vol. 44 ›› Issue (1): 47-53.doi: 10.12305/j.issn.1001-506X.2022.01.07

• Electronic Technology • Previous Articles     Next Articles

Dual frequency blocking interference laws with high order nonlinear distortion

Kai ZHAO1,2, Guanghui WEI1,*   

  1. 1. National Key Laboratory on Electromagnetic Environment Effects, Shijiazhuang Campus of Army Engineering University, Shijiazhuang 050003, China
    2. Unit 63870 of the PLA, Huayin 714200, China
  • Received:2021-02-03 Online:2022-01-01 Published:2022-01-19
  • Contact: Guanghui WEI

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

CLC Number: 

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