Radio frequency interference suppression method for high frequency surface wave radar based on tensor subspace projection

Abstract

The invention provides a radio frequency interference suppression method for a high frequency surface wave radar based on tensor subspace projection. Depending on the distance correlation and direction characteristics of radio frequency interference, joint estimation is performed on a radio frequency interference subspace from multiple dimensions by tensor decomposition. The implementation processcomprises the following steps: performing Doppler sliding window processing based on radar data to finish data segmentation; performing radio frequency interference detection; judging whether interference frequency points exist in a currently-selected data block or not; if radio frequency interference exists, constructing a third-order tensor by using long-distance metadata without sea echo of multiple antenna channels to serve as a training tensor; performing tensor decomposition on the training tensor by using high-order singular value decomposition; estimating a radio frequency interference subspace; and performing distance sliding window and subspace projection processing to obtain data without radio frequency interference. The method can suppress radio frequency interference to a great extent, improve data quality and retain a target signal completely, has a good application effect, improves the detection performance of a radar system, and has important practical application value.

Description

technical field [0001] The invention belongs to the field of high-frequency ground-wave radar signal processing, and in particular relates to a high-frequency ground-wave radar (HFSWR) anti-radio frequency interference method based on Zhang quantum space projection. Background technique [0002] Based on the Bragg scattering mechanism of high-frequency electromagnetic waves on the ocean surface, high-frequency ground wave radar can detect large-area ocean dynamic parameters with high precision, such as real-time measurement of ocean current field, wind field, and wave field, which is of great importance to marine science. Research, marine disaster weather forecasting, etc. have guiding significance. However, high-frequency ground wave radar works in the high-frequency band (3MHz~30MHz), and the electromagnetic environment in this frequency band is very harsh. A short-wave radio communication, mobile communication, broadcasting and a large number of amateur radio communicati...

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Problems solved by technology

[0004] In view of the above problems, the present invention proposes a method for suppressing radio frequency interference of high frequency ground wave radar based on tensor quantum space projection. The overlapping of interference and ocean echo signals on the echo spectrum can effectively suppress radio frequency interference while completely retaining the target signal, thereby improving the detection performance of the radar

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