A Method of Suppressing Radio Frequency Interference of High Frequency Ground Wave Radar Based on CEMD

Abstract

The invention relates to the field of the signal processing of radars, and in particular relates to a method for suppressing the radio-frequency interference of a high-frequency ground wave radar based on CEMD (Complex Empirical Mode Decomposition). According to the method, on the basis of the original signal processing of the high-frequency ground wave radar, a threshold value is set through utilizing a median; the radio-frequency interference is judged to be existing when a primary signal is higher than the threshold value; the primary signal is moved to a high-frequency band; multiple intrinsic mode functions are decomposed from the primary signal by utilizing a complex empirical mode decomposition algorithm; the interference is detected and located in each intrinsic mode function through a fixed threshold value method; the zero setting processing is carried out on the interference; the processed primary signal is moved back to the original frequency band; a reconstructed signal is obtained. By using the method for suppressing the radio-frequency interference of the high-frequency ground wave radar based on the CEMD, the transient and non-transient interference can be suppressed at the same time; in actual data processing, the application effect is good; an echo signal is not damaged while the interference is decreased; the suppression effect is obvious; the detection range of the radar is increased; the detection precision of the radar is improved.

Description

technical field [0001] The invention belongs to the field of radar signal processing, in particular to a method for suppressing radio frequency interference of high frequency ground wave radar, in particular to a method for suppressing radio frequency interference of high frequency ground wave radar based on CEMD. Background technique [0002] High-frequency ground wave radar is an important detection equipment that can monitor large-scale marine environments, and it is increasingly favored by people because of its all-weather, wide-range, and continuous work for months or even years without being affected by rain and fog . The total length of my country's coastline exceeds 32,000 kilometers, so high-frequency ground wave radar is of great significance to the national economy and national defense construction. [0003] High-frequency ground wave radar generally works at 3-30MHz, and there will be a lot of radio frequency interference in this frequency band. The radio freque...

AI Technical Summary

Problems solved by technology

However, the algorithm requires radio frequency interference to maintain spatial stability, which is difficult to meet during the entire coherent accumulation time, and the algorithm cannot suppress the main lobe interference

In view of the current situation that the radar signal is affected by both transient interference and non-transient interference during the entire coherent accumulation time, there is currently no good algorithm that can suppress the above two interferences at the same time

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