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Sky-wave over-the-horizon radar short-time detection method based on extrapolation of AR model

A technology of over-the-horizon radar and AR model, which is applied in the field of Doppler spectrum estimation, to achieve the effect of improving Doppler frequency resolution, convenient upgrading, and easy promotion

Inactive Publication Date: 2018-06-19
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the difficulties and problems faced by sky wave radar detection of fast maneuvering targets and slow ship targets, and overcome the deficiencies in the prior art

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  • Sky-wave over-the-horizon radar short-time detection method based on extrapolation of AR model
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  • Sky-wave over-the-horizon radar short-time detection method based on extrapolation of AR model

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Embodiment Construction

[0029] Coherent accumulation has two functions in the radar system: one is to accumulate the weak signal energy so that it can stand out from the noise floor; the other is to distinguish multiple signals including clutter with similar frequencies. The length of data used for coherent accumulation is directly proportional to the effect of these two points. But as mentioned earlier, the longer the coherent accumulation time, the greater the negative impact on system operation. In order to solve this contradiction, the super-resolution method that improves the frequency resolution under the premise of a shorter duration has become one of the research hotspots in the field of radar signal processing.

[0030] At present, most super-resolution spectrum estimation methods are based on parameter models, that is, a set of parameter models is designed according to the scene, the parameters of the model are estimated using data, and finally the spectrum is reconstructed from these param...

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Abstract

The invention discloses a sky-wave over-the-horizon radar short-time detection method based on the extrapolation of an AR model. According to the method, a Burg method is used to carry out AR model reconstruction and extrapolation on original pulse data which is subjected to space-time domain processing, original data and reconstructed data are used comprehensively, an obtained result is closely related to a real spectrum, an improvement result of the reconstructed data is introduced, by the adoption of a large-scale model order and an extrapolation length, the extrapolation effect is improved, and the possibility of distortion is avoided while a spectrum estimation effect is improved. Specific steps are shown in attached drawings. The technology is not limited to a sky-wave over-the-horizon radar system and can be widely applied to many types of large-scale phased-array radars, and the method has the value of promotion and application.

Description

technical field [0001] The invention relates to a Doppler spectrum estimation method in the field of radar signal processing, which is suitable for the signal processing system of sky-wave over-the-horizon radar, and can be used for the detection of slow moving targets with long coherent accumulation time and the detection of maneuvering targets requiring fast detection . At the same time, the core theory and method can also be applied to other signal processing systems that require short-term detection. Background technique [0002] The sky-wave over-the-horizon radar uses the reflection of the ionosphere on electromagnetic waves to detect targets beyond the line-of-sight. It has a large coverage and can provide long-range early warning intelligence information. Compared with traditional line-of-sight radars, its working distance is increased by more than an order of magnitude. It can be seen from the radar equation that in order to achieve this goal, the SNR (Signal Noise...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 鲍拯陈建文卢琨
Owner AIR FORCE EARLY WARNING ACADEMY
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