Radio-frequency interference suppression method of high-frequency ground wave radar

A technology of high-frequency ground wave radar and radio frequency interference, which is applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems of interference with the normal operation of radar, signal loss side lobe amplitude, and poor suppression effect, so as to improve the detection accuracy of radar, Increase the radar detection distance, the suppression effect is remarkable

Inactive Publication Date: 2014-07-30
WUHAN UNIV
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Problems solved by technology

(2) The time when the radio frequency interference is more serious generally occurs from 17:00 to 21:00 in the evening. At this time, due to the disappearance of the D layer of the ionosphere, the communication signals of short-wave radio stations, especially busy fishing boats, cannot be effectively shielded by the ionosphere. Enter the radar system and interfere with the normal operation of the radar
In the adaptive beamforming anti-jamming method, because it relies on a large phased antenna array, the system is more complicated, and it is not suitable for small-aperture wide-beam radars, so this method is rarely used
However, the anti-jamming met

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[0030] The present invention will be further explained below with specific examples in combination with the drawings.

[0031] The working principle of the chirp system high frequency ground wave radar and the characteristics of radio frequency interference are introduced as follows:

[0032] The working principle block diagram of high frequency ground wave radar is as follows figure 1 As shown (where 1 is the receiving antenna, 2 is the linearly swept local oscillator signal, 3 is the low-pass filter, 4 is the solution distance transform, and 5 is the Doppler transform). The radar adopts the linear frequency modulation waveform system. In each frequency sweep cycle, the echo is demodulated, low-pass filtered, sampled, and discrete Fourier transform in the fast time domain to obtain the range spectrum of the frequency sweep cycle. Each spectrum point in the distance spectrum corresponds to a sampling point of a distance element. In the coherent accumulation time of multiple sweep ...

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Abstract

The invention relates to the field of radar signal processing, in particular to a radio-frequency interference suppression method of a high-frequency ground wave radar. According to the method, on the basis of original high-frequency ground wave radar signal processing, an empirical mode decomposition method is used for decomposing received signals to obtain a plurality of intrinsic mode functions, radio-frequency interference positions are detected through standard deviation and sliding window processing, power spectrum judgment and instantaneous frequency judgment are conducted on sampling points of the radio-frequency interference positions of the intrinsic mode functions, and the amplitude of the sampling points meeting requirements is set to be zero. According to the radio-frequency interference suppression method of the high-frequency ground wave radar, in actual data processing, the application effect is good, signals are not damaged while noise is reduced, the suppression effect is obvious, the radar detection range is expanded, and the radar detection accuracy is increased.

Description

Technical field [0001] The invention belongs to the field of radar signal processing, and particularly relates to a method for suppressing radio frequency interference of a high frequency ground wave radar. Background technique [0002] High-frequency ground wave radar is an important detection equipment that can continuously monitor the ocean environment in a large area. It mainly detects ocean dynamics parameters such as wind, waves, currents and tides on the ocean surface and low-altitude and low-speed moving targets on the sea surface. The total length of my country’s coastline exceeds 32,000 kilometers, so the high frequency ground wave radar is of great significance to the national economy and national defense construction. [0003] High-frequency ground wave radars generally work at 3-30MHz, and there will be a lot of radio frequency interference in this frequency band. Radio frequency interference mainly comes from the dense short-wave communication signals, broadcast statio...

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/023G01S7/2927G01S7/36
Inventor 陈泽宗谢飞易盛赵晨曾耿斐
Owner WUHAN UNIV
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