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Anti-RF interference method for high frequency radar

A radio frequency interference and radar technology, which is applied in the field of array channel correction for high-frequency radar, can solve the problems of complex system, loss and distortion of useful signals, and inapplicability to small-diameter wide-beam radar, etc. The effect of the convenient processing method

Inactive Publication Date: 2006-07-19
WUHAN UNIV
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Problems solved by technology

In the existing high-frequency radar anti-jamming methods, the commonly used adaptive beamforming anti-jamming method relies on a large phased antenna array, the system is relatively complex, and it is not suitable for small-aperture wide-beam radars; and from the time domain of the signal Anti-jamming methods based on frequency-domain characteristics, such as the detection-cut-interpolation method based on the instantaneous characteristics of interference and the interference signal subspace orthogonal projection method based on the interference distance distribution characteristics, etc., all need to analyze the received signal containing radio frequency interference Therefore, it will inevitably cause a certain degree of loss and distortion to the useful signal (such as the broadening of the main lobe of the signal spectrum and the increase of the side lobe), and when there are multiple disturbances, this effect is more serious

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Embodiment Construction

[0017] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0018] The working principle of high-frequency radar with chirp system and the characteristics of interference spectrum are briefly introduced as follows:

[0019] The working principle block diagram of high frequency ground wave radar is as follows: figure 1 shown. The radar adopts the linear frequency modulation system, and performs low-pass filtering, sampling and fast-time discrete Fourier transform on the demodulated signal in each frequency sweep period to obtain the distance spectrum of the frequency sweep period, in which each spectral point corresponds to a distance A spectral value sample on the element, in the coherent accumulation time composed of multiple frequency sweep cycles, the slow time-domain discrete Fourier transform is performed on multiple range spectrum sequences to obtain the range-Doppler two-dimensional spectrum (as s...

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Abstract

The invention relates to a high frequency radar anti-radio frequency interference method, which detects the interference signal on the radar collected far distance element accumulating Doppler spectrum by the setting signal-to-noise ratio gate and adopts different scan frequency impulse phase modulating modes to reduce the bad effect of the detecting result by the radio frequency interference distribution received by the high frequency radar.

Description

technical field [0001] The invention relates to a method for correcting an array channel of a high-frequency radar by using a phase-modulated ionospheric echo signal of a frequency signal. Background technique [0002] Because of its unique over-the-horizon and all-weather detection capabilities, high-frequency (3-30MHz) radar has been widely studied and successfully applied to the measurement of ocean surface dynamic parameters, and can detect moving targets such as ships, aircraft and missiles in real time. The radio frequency interference generated by dense short-wave communication and radio stations in the high-frequency band will seriously affect the detection performance of the radar, which is a major problem in the operation of high-frequency radar. In the existing high-frequency radar anti-jamming methods, the commonly used adaptive beamforming anti-jamming method relies on a large phased antenna array, the system is relatively complex, and it is not suitable for sma...

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Application Information

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IPC IPC(8): G01S7/36
Inventor 周浩文必洋吴世才
Owner WUHAN UNIV
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