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Airborne radar clutter self-adaption restraining method based on main-lobe clutter registering

An airborne radar, self-adaptive technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of reduced MVDR spectral resolution, large amount of calculation, poor compensation performance, etc.

Inactive Publication Date: 2014-08-06
HOHAI UNIV
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Problems solved by technology

However, the compensation parameters of the above algorithm are directly calculated according to the radar system parameters, and the compensation performance is relatively poor under the error; the second is to estimate the compensation coefficient based on the MVDR spectrum after space-time sub-aperture smoothing, but the sub-aperture smoothing reduces the resolution of the MVDR spectrum And the amount of calculation is huge

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  • Airborne radar clutter self-adaption restraining method based on main-lobe clutter registering
  • Airborne radar clutter self-adaption restraining method based on main-lobe clutter registering
  • Airborne radar clutter self-adaption restraining method based on main-lobe clutter registering

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Embodiment Construction

[0063] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0064] Airborne radar geometry such as figure 1 shown. Assuming that the radar antenna is a uniform linear array, the aircraft flies along the X-axis at a speed v, and β and α are the included angles of the scatterer P relative to the antenna axis and the direction of the speed v, respectively. Consider the non-frontal side-view array, ψ is the yaw angle, θ and are the azimuth and elevation angles, respectively. The flying height of the carrier aircraft is H, the number of antenna elements is N, and the number of time-domain pulses in a coherent processing interval is K, then the noise signal received by the l-th distance unit is:

[0065] X l = Σ i = 1 N c σ ...

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Abstract

The invention discloses an airborne radar clutter self-adaption restraining method based on main-lobe clutter registering. The STAP clutter restraining method based on efficient and self-adaption main-lobe clutter registering is researched according to the airborne non-side-looking array radar clutter distance space-variant characteristic. In order to reduce the operand, firstly, the main-lobe clutter Doppler frequency is accurately estimated according to a cascading method, then the space angular frequency of the main-lobe clutter is estimated through a sparse reconstruction technology, two-dimensional registering is carried out on main-lobe clutters of different distance units, and finally the clutter restraining is carried out through a dimensionality reduction STAP algorithm. A simulation experiment result shows that after the main-lobe clutter registering, the dimensionality reduction STAP improvement factor is improved by about 18 dB on the main-lobe clutter area, and the detection performance on slow moving targets is improved significantly. The method is small in operand and easy to implement.

Description

technical field [0001] The invention discloses an airborne radar clutter adaptive suppression method based on main lobe clutter registration, and relates to the technical fields of airborne radar clutter suppression and space-time adaptive processing (STAP). Background technique [0002] Airborne radar is an important sensor for detecting moving targets in modern battlefields. However, when the airborne radar looks down, the clutter spectrum is seriously broadened, which leads to the decline of slow target detection performance. In 1973, Reed and Brennan proposed the concept of Space-Time Adaptive Processing (STAP) to adaptively suppress clutter in a space-time two-dimensional plane, which can significantly improve the detection performance of airborne radars for slow targets. In the past 40 years, STAP has been a research hotspot in the field of radar signal processing, and it is also a key technology for the new generation of airborne radar clutter suppression. [0003] ...

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/2813G01S7/2925
Inventor 王杰沈明威杨柳于佳
Owner HOHAI UNIV
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