Laws of Second-order Intermodulation FalseAlarm Interference Effect for Stepped-Frequency Continuous Wave Radar underElectromagnetic Radiation

doi:10.12382/bgxb.2021.0540

Abstract

Abstract: In order to improve the electromagnetic protection ability of radars, second-order intermodulation false alarm interference effect caused by electromagnetic radiation on ordinary radars is studied. And a stepped-frequency continuous wave radar is studied. Using theoretical analysis and conducting tests, the level change law, waveform characteristics and location law for false alarm targets are studied, and the test methods for sensitive frequency offset (frequency band) and sensitive frequency difference are released. The results show that the dual frequency electromagnetic radiation can produce a second-order intermodulation signal during the down conversion of the receiver, which can make the tested radar produce a “spike” false alarm target with a fixed and calculable position under appropriate conditions. With any component or two components of dual frequency interference increase in the same proportion, the second-order intermodulation false alarm level increases linearly at first and then slowly increases until it reaches its maximum, and then decreases slowly. False alarms caused by the second-order intermodulation can be much higher than those caused by single frequency interference. The sensitivity frequency band of the tested radar is about (f₀-180 MHz)~(f₀+160 MHz), and the sensitivity frequency difference is no more than 2.70 MHz.

Key words: radar, electromagneticradiation, second-orderintermodulation, falsealarminterference, test

CLC Number:

TM937

ZHAO Kai, WEI Guanghui, PAN Xiaodong, WAN Haojiang, LU Xinfu. Laws of Second-order Intermodulation FalseAlarm Interference Effect for Stepped-Frequency Continuous Wave Radar underElectromagnetic Radiation[J]. Acta Armamentarii, 2022, 43(11): 2819-2826.

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