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Sky-wave over-the-horizon radar pulse compression method based on AR model reconstruction

An over-the-horizon radar and AR model technology, which is applied in the field of target detection, can solve the problems of sky-wave radar working frequency band interference and limited bandwidth, and achieve the effects of enhanced flexibility, improved working performance, and convenient upgrades

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

[0006] The purpose of the present invention is to solve the problem of numerous interferences and limited bandwidth in the working frequency band of sky wave radar, and overcome the deficiencies of the prior art

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  • Sky-wave over-the-horizon radar pulse compression method based on AR model reconstruction
  • Sky-wave over-the-horizon radar pulse compression method based on AR model reconstruction
  • Sky-wave over-the-horizon radar pulse compression method based on AR model reconstruction

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Embodiment Construction

[0045] Pulse compression is a common technical means in modern system radar, and its essence is to maximize the signal-to-noise ratio of the echo signal through matched filtering. Although the sky-wave over-the-horizon radar uses frequency-modulated continuous wave signals, it can still be regarded as a special pulse signal with a duty ratio of 1, and pulse compression technology is also used. However, unlike conventional radar, there are a large number of other users in the high-frequency band where sky-wave over-the-horizon radar works. The signal bandwidth of these users is narrow but the number is large, and the location and time of appearance are not fixed. In order to avoid these interferences, the sky-wave radar adopts real-time electromagnetic environment monitoring measures to select clean and available frequency bands with no user signals.

[0046] In conventional pulse compression techniques, the frequency band of the FM signal should be continuous. In the case of ...

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Abstract

The invention discloses a sky-wave over-the-horizon radar pulse compression method based on AR model reconstruction. According to the method, an AR model is used to reconstruct frequency-domain data which is subjected to space-time domain processing; interpolation after excavation is carried out for narrow-band interference in a bandwidth; extrapolation expansion is carried out on data on two sides of the bandwidth; and a conventional pulse pressure result is replaced with AR spectrum estimation when the interference is too much and exceeds the number of clean frequency band units. So the available signal bandwidth of a sky-wave radar is greatly expanded, the radar is not limited by the use of a continuous clean frequency band, and a pulse pressure result distortion caused by intermittentwaveforms is avoided at the same time. Specific steps are shown in attached drawings. The technology is not limited to a skywave 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 pulse compression method in the field of radar signal processing, which is suitable for a signal processing system of sky-wave over-the-horizon radar, and can be used for target detection under the condition of high-frequency interference and limited bandwidth. At the same time, the core theory and method can also be applied to other signal processing systems that require pulse compression. Background technique [0002] Sky-wave over-the-horizon radar uses the ionosphere's reflection of electromagnetic waves to detect targets beyond the line of sight. It has a large coverage and can provide long-range early warning intelligence information. However, because it works in a crowded high-frequency band, the available bandwidth is usually only ten to tens kilohertz, which limits the further development of system performance. [0003] Unlike conventional radars, sky-wave radars face a very complex environment. In its wide coverag...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S7/292G01S7/288
CPCG01S7/288G01S7/292G01S7/36G01S7/2883
Inventor 鲍拯陈建文马洪
Owner AIR FORCE EARLY WARNING ACADEMY
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