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ISAR imaging time period selection method based on tracking information

A technology for tracking information and imaging time, applied in the field of communication, can solve the problem of large amount of calculation for image evaluation, achieve the effect of improving azimuth resolution and overcoming the large amount of calculation

Active Publication Date: 2017-02-15
XIDIAN UNIV +1
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Problems solved by technology

[0005] The present invention aims at the problem of large amount of calculation for image evaluation in the above-mentioned prior art, and the optimization selection of ISAR imaging time period requires prior information and the limitations of assuming the periodic movement of the target, and proposes a target attitude angle using air tracking information. Calculation and Optimum Selection of ISAR Imaging Time Segment

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  • ISAR imaging time period selection method based on tracking information

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0046] Step 1, obtain the three-dimensional coordinates of the target.

[0047] The coordinate transformation process is carried out on the tracking information received by the inverse synthetic aperture radar ISAR, and the three-dimensional coordinates of the target are obtained.

[0048] Described coordinate transformation process is finished according to the following formula:

[0049] x l =Rj · cosβ j

[0050] the y l =R j · cosβ j · sinα j

[0051] z l =R j · sinβ j

[0052] Among them, α j , β j , R j Respectively represent the azimuth angle, elevation angle and distance of the target in the radar coordinate system at the jth moment, x l 、y l ,z l Indicates the three-dimensional coordinates of the target at time l.

[0053] Step 2,...

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Abstract

The invention discloses an inverse synthetic aperture radar imaging time period selection method based on tracking information. The method is implemented by the steps as follows: (1) getting the three-dimensional coordinates of a target; (2) performing coordinate transformation; (3) performing Kalman filtering on the three-dimensional speed of the target; (4) selecting a window length based on prior knowledge; (5) screening a target attitude angle; (6) selecting an imaging time period; (7) getting a time window after sliding; (8) judging whether the time corresponding to the target attitude angle in the window after sliding is the end time of data receiving; and (9) determining an optimal imaging time period. Through the method, under the condition of a non-cooperative maneuvering target in the air, an optimal inverse synthetic aperture radar ISAR imaging time period can be selected, and a high-quality inverse synthetic aperture radar ISAR imaging result can be obtained.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for selecting an imaging time period of an Inverse Synthetic Aperture Radar (Inverse Synthetic Aperture Radar) based on tracking information in the technical field of radar signal processing. The invention can be used for optimal selection of the time period of inverse synthetic aperture radar (ISAR) imaging of non-cooperative air maneuvering targets. Background technique [0002] ISAR echo data is obtained by long-term observation of air targets. If all the data is directly imaged, although the target rotation angle is relatively large, the effective attitude change of the target during the imaging accumulation time is very complicated, especially the target attitude rotation vector during the accumulation time. When significant changes occur, the inverse synthetic aperture radar (ISAR) imaging focus becomes significantly worse; conversely, if only limited t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
CPCG01S7/41G01S13/90G01S13/9064
Inventor 王家东张磊杜兰
Owner XIDIAN UNIV
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