Spaceborne SAR moving target detection method 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: 2018-05-18
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 movi

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  • Spaceborne SAR moving target detection method based on two-dimensional velocity search
  • Spaceborne SAR moving target detection method based on two-dimensional velocity search
  • Spaceborne SAR moving target detection method based on two-dimensional velocity search

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[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementations. Examples of the implementations are shown in the accompanying drawings. The implementations described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention. It cannot be interpreted as a limitation of the present invention.

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

[0037] Step 1, data preprocessing, range pulse compression on the echo received by the radar, that is, the following operations are completed:

[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 echo data of the point target after the distance pulse compression, t is the slow time variable in the azimuth direct...

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Abstract

The invention discloses a spaceborne SAR moving target detection method based on a two-dimensional velocity search and belongs to the technical field of radar target detection. The method is aimed atthe unknown of specific state of moving targets and combined with a RD algorithm, and by traversing an evenly spaced two-dimensional array which is recorded as vx(m) and vy(n) (representing an azimuthdirection search speed and a distance direction search speed respectively), respectively designs a distance migration correction function and an azimuth direction matching function to achieve focusedimaging of the moving targets. An azimuth direction filter is corrected to eliminate imaging azimuth shifts caused by distance direction speeds of the moving targets, the strongest amplitude values of the moving targets are extracted at different search speeds for constant false alarm detection, and the detection probability of the moving targets is significantly increased. 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] Synthetic Aperture Radar (SAR) system uses the transmitted range-to-wideband signal and the azimuth chirp signal brought by the platform movement to realize the imaging of stationary ground targets. As a kind of imaging radar, the imaging technology of spaceborne SAR for stationary targets has become more perfect and mature. With the development of spaceborne SAR technology, the use of spaceborne SAR to detect ground moving targets has gradually attracted people's attention. The detection and imaging of moving targets is one of the basic functions that modern radars should complete, and it has also become an important development direction for synthetic aperture radars. [0003] Since the spaceborne SAR is in a downward looking state, the echo will inevita...

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Application Information

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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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