Airborne radar unintentional interference suppression method in complex interference scene

Abstract

The invention discloses an airborne radar unintentional interference suppression method in a complex interference scene. The method comprises the steps of allowing an airborne radar to receive distance-pulse domain echo data; judging whether asynchronous short pulse interference exists or not by adopting an interference detection method based on time-frequency domain characteristics, and eliminating the asynchronous short pulse interference by adopting a time-domain trapped wave interference suppression method; performing two-dimensional Fourier transform on the distance-pulse domain echo datato obtain distance frequency-Doppler two-dimensional frequency domain echo data; judging whether narrowband continuous wave interference exists or not by adopting a narrowband continuous wave interference detection method, and if so, suppressing the narrowband interference by adopting a frequency domain notch method; and carrying out inverse Fourier transform on the echo data in a distance frequency dimension. According to the method, various forms of unintentional interference of narrow-band continuous wave interference and asynchronous short pulse interference can be effectively suppressedat the same time, and the radar target detection performance is improved.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to an airborne radar unintentional interference suppression method in complex interference scenarios, which is suitable for realizing the unintentional interference suppression of airborne early warning radar echoes. Background technique [0002] Compared with ground-based warning radars, airborne early warning (AEW) radars have unique advantages in detecting enemy air targets, so they play a very important role in modern warfare. [0003] With the advent of information warfare, electronic countermeasure technology has been vigorously developed, and the working environment of airborne early warning radar has undergone profound changes. In addition to being affected by clutter, it also faces many different types of interference, which greatly affects the detection performance of the radar and greatly reduces the reliability and stability of the early warning system. [0004] According...

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Problems solved by technology

[0007] At present, there are few studies on asynchronous interference. Domestic scholars have proposed an asynchronous interference elimination method based on signal processing. Using the singularity of asynchronous interference, the interference is detected in advance through pulse cancellation, CFAR processing and threshold detection, and then the detected The singular value of the adjacent signal is used for interpolation replacement, while the useful signal is retained, the asynchronous interference is eliminated; in addition, the interference signal can be separated from the target echo by using the characteristic that the time-frequency characteristics of the asynchronous interference are different from the target echo signal Open, build a proper notch filter to filter out asynchronous interference

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