Two-dimensional ISRA imaging method of object with micro rotation in air

An imaging method and target technology, applied in the field of signal processing, can solve the problems of low position accuracy and high side lobes of rotating target images, and achieve the effects of high position estimation accuracy, high real-time performance, and overcoming high side lobes.

Active Publication Date: 2012-04-25
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this method is that because the EHT algorithm is affected by the point spread functi

Method used

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  • Two-dimensional ISRA imaging method of object with micro rotation in air
  • Two-dimensional ISRA imaging method of object with micro rotation in air
  • Two-dimensional ISRA imaging method of object with micro rotation in air

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Embodiment Construction

[0038] Attached below figure 1 , the specific embodiment of the present invention is described in further detail:

[0039] Step 1, obtain the ISAR echo of the target, the radar transmits and receives the pulse at the pulse repetition frequency, and obtains the ISAR echo with the distance as the row vector and the azimuth as the column vector;

[0040] Step 2, Compensation for ISAR echo translation of the target

[0041] 2a) The adjacent correlation method is used for envelope alignment, the range image of the ISAR echo is convolved with its adjacent range image, and the time delay corresponding to its peak value is used as the compensation amount to align the envelope of the echo;

[0042] 2b) Use the multi-point autofocus method for initial phase correction, use the distance units with small fluctuations in amplitude after envelope alignment as special points, and integrate multiple special point units into a high-quality integrated feature point , the initial phase correct...

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Abstract

The invention discloses a two-dimensional ISRA imaging method of an object with micro rotation in the air. The method comprises the following steps that: (1), a radar matriculates an ISAR echo; (2), translation compensation is carried out; (3), time frequency distribution map is drafted; (4), micro doppler distance units are determined; (5), echo separation of a distance unit; (6), it is determined whether all distance unit have been traversed; (7), a distance-doppler method is used to carry out imaging on a rigid body echo; and (8), imaging is carried out on a rotary part echo. According to the invention, a low frequency modulation rate matched filtering method is employed to carry out echo separation, so that an adaptive chirplet decomposition imaging method's disadvantages including large calculated amount, high time consumption and insufficience of real-time property are overcome; therefore, the method has advantages of simple realization, high efficient and high real-time property. According to the invention, an I-Radon conversion is employed to carry out imaging on a rotary part; therefore, defects of an EHT algorithm are overcome, wherein the defects include high image sidelobe of a rotary object, low precision of estimation position and inaccuracy of object identification; and the method has advantages of good image focusing, high position estimation precision and accurate object identification.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a two-dimensional ISAR imaging method for a micro-motion rotating target in the air in the field of radar imaging. The invention can effectively detect the micro-motion rotating target in the air, and accurately locate and image the target. Background technique [0002] When using Inverse Synthetic Aperture Radar (ISAR) to image micro-moving targets in the air, aircraft propellers, helicopter rotors, turbine engine blades, precessing missile warheads and other micro-moving rotating parts will affect the radar waveform within a certain range of attitude angles. Modulation is performed to generate a radar echo signal containing a periodic modulation component, that is, a micro-Doppler effect is generated, and its rotating parts will appear as a modulation interference band along the Doppler direction in the ISAR image, which will affect the ISAR image quality of the...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
Inventor 白雪茹周峰刘妍保铮
Owner XIDIAN UNIV
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