| Citation: | ZHAO H Z，WEI G H，PAN X D，et al. Dual-frequency continuous wave pseudo-signal interference effect in swept-frequency radar[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（9）：2843-2851 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0739
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To fully understand the impact of dual-frequency electromagnetic radiation pseudo-signal interference on radar and uncover the underlying mechanism behind this interference effect. Taking a Ku-band swept-frequency ranging radar as the test object, a dual-frequency continuous wave pseudo-signal interference effect test was carried out, and the effect mechanism of second-order intermodulation RF interference, second-order intermodulation low-frequency interference and third-order intermodulation low-frequency interference was revealed respectively. The variation rule of the pseudo-signal level with the interference field intensity was determined, and the morphological characteristics and generation position of the pseudo-signal were explained. The test results indicate that when the difference in interference frequency is approximately between 540 MHz and 660 MHz, the out-of-band dual-frequency second-order intermodulation signal will generate pseudo-signal interference of the wide-pulse type, with a random location for the pseudo-signal. On the other hand, when the difference in interference frequency is less than 5 MHz, both the dual-frequency second-order intermodulation signal and the third-order intermodulation signal will produce pseudo-signal interference of the impulse type, with a fixed location for the pseudo-signal.
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