Detection method of spaceborne sar moving target based on two-dimensional velocity search

A moving target and detection method technology, applied in the field of spaceborne SAR moving target detection, can solve the problem that the real speed of the moving target cannot be known in advance, and achieve the effect of improving the signal-to-noise ratio

Active Publication Date: 2021-06-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The key compensation function in this imaging algorithm needs to know the real velocity value of the moving target, but the real velocity of the moving target cannot be known in advance in practical applications

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  • Detection method of spaceborne sar moving target based on two-dimensional velocity search
  • Detection method of spaceborne sar moving target based on two-dimensional velocity search
  • Detection method of spaceborne sar moving target based on two-dimensional velocity search

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, examples of said embodiments are shown in the accompanying drawings, and the embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention, and It should not be construed as a limitation of the invention.

[0036] The present invention is a spaceborne SAR moving target detection method based on two-dimensional velocity search, and its method flow is as follows figure 2 shown, including the following steps:

[0037] Step 1, data preprocessing, performs range-to-pulse compression on the echoes received by the radar, that is, completes the following operations:

[0038] s(t,τ)=σB r ·W a (t)exp-[j4πr(t) / λ]sinc{πB r [τ-2r(t) / c]}

[0039] Among them, s(t,τ) is the point target echo data after pulse compression in the range direction, t is the slow time variable in ...

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Abstract

The invention discloses a spaceborne SAR moving target detection method based on two-dimensional speed search, which belongs to the technical field of radar target detection. Aiming at the unknown of the specific state of the moving target, the present invention combines the RD algorithm by traversing a uniformly spaced two-dimensional array denoted as v x (m), v y (n) (representing the azimuth search speed and the range search speed respectively), respectively design the range migration correction function and the azimuth matching function to realize the focused imaging of the moving target. Then the azimuth filter is corrected to eliminate the imaging azimuth offset caused by the distance and velocity of the moving target. Extracting the strongest amplitude values ​​of moving objects at different search speeds for constant false alarm detection will significantly improve the detection probability of moving objects. Simulation results verify the feasibility and effectiveness of the method.

Description

technical field [0001] The invention discloses a spaceborne SAR moving target detection method based on two-dimensional speed search, which belongs to the technical field of radar target detection. Background technique [0002] The Synthetic Aperture Radar (SAR) system utilizes the transmitted range wideband signal and the azimuth chirp signal brought by the platform movement to realize the imaging of stationary targets on the ground. As an imaging radar, the imaging technology of spaceborne SAR for stationary targets has been perfected and matured. With the development of spaceborne SAR technology, the detection technology of ground moving targets using spaceborne SAR has gradually attracted people's attention. The detection and imaging of moving targets is one of the basic functions that modern radar should complete, and it has also become an important development direction of synthetic aperture radar. [0003] Since the spaceborne SAR is in a downward-looking state, the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9029G01S13/904
Inventor 闫贺王珏王旭东张劲东朱岱寅
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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