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Method for estimating target rotation of inverse synthetic aperture radar based on time-space image sequence

An inverse synthetic aperture and image sequence technology, applied in the radar field, can solve the problems of low lateral resolution of ISAR radar images, difficulty and inaccuracy in the extraction of multi-view imaging information, and achieve easy engineering implementation, ensure accuracy and stability, The effect of small amount of computation

Inactive Publication Date: 2010-06-16
TSINGHUA UNIV
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Problems solved by technology

[0009] In order to overcome the defects of low lateral resolution of existing ISAR radar images and difficult and inaccurate extraction of multi-view imaging information, and to meet ISAR's application requirements for RD image lateral calibration, large-view high-resolution imaging and 3D imaging, etc., The present invention proposes an ISAR target rotation estimation method based on spatio-temporal image sequence

Method used

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  • Method for estimating target rotation of inverse synthetic aperture radar based on time-space image sequence

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Embodiment 1

[0042] In an embodiment of the present invention, the method described in the present invention uses the data provided by a certain experimental ISAR system in my country to process, figure 2 An aircraft target model is shown as the object of calibration in this embodiment. In the experimental ISAR system, the radar carrier frequency is 5.52GHz; the chirp signal is transmitted with a bandwidth of 400MHz; the pulse compression signal is obtained by Dechirp mode, and the quadrature I / Q dual-channel sampling is performed, and the sampling frequency is 10MHz; the equivalent pulse repetition The frequency is 200Hz; 1024 pulses are obtained for processing.

[0043] During the acquisition process of a batch of target image data, the rotation vector of the radar relative to the target remains approximately constant, that is, the rotation center, rotation direction and rotation speed remain unchanged. According to the basic principle of radar imaging, range-Doppler imaging is perform...

Embodiment 2

[0095] In the second embodiment of the present invention, after target translation compensation, under plane wave illumination, the high resolution along the radar line-of-sight direction (distance direction) is obtained by processing the broadband echo of the target; The Doppler frequency information of the wave forms high resolution across distance.

[0096] Figure 5 is a schematic diagram of inverse synthetic aperture radar imaging based on the rotating body model; Figure 5 As shown, assume that after the translation compensation, the target is at ω o Rotate at a constant speed, then a point on the target (x o ,y o ) to the radar antenna phase center (APC) instantaneous distance can be expressed as:

[0097] r = [ r o 2 + r a 2 - 2 ...

Embodiment 3

[0135] like Image 6 As shown, the original data received by the two radars are equally divided on the time axis, and two RD images are obtained respectively. For example, the data received by radar A are A1 and A2, and the data received by radar B are B1 and B2. The specific acquisition and application are described below.

[0136] After the translation compensation as mentioned above, the target with ω o Rotate at a constant speed, then a point on the target (x o ,y o ) to the antenna phase center (APC) of radar A and radar B can be expressed as:

[0137] R A ( t m ) = R AO 2 + r o 2 - 2 R AO r o cos ( ...

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Abstract

The invention discloses a method for estimating target rotation of an inverse synthetic aperture radar (ISAR) based on time-space image sequence, which comprises the following steps: acquiring a time-dimensional RD image sequence of the ISAR according to the received echo data; and analyzing and estimating the rotation of a target by tracking attitude change between images caused by the rotation of the target; judging whether the rotation planes of the target in any two RD images are coplanar according to a time-space two-dimensional image sequence acquired by a single receiver or a plurality of receivers; when the rotation planes are coplanar, further improving the estimation precision of a rotation parameter through a dominant point method or a rotation related method; moreover, realizing large-angle high-resolution imaging by PFA or CBP algorithm; and when the rotation planes are non-coplanar, estimating the azimuth and pitching rotation information of the target so as to realize three-dimensional imaging of the target. The method ensures the target rotation estimation precision and stability, and meanwhile can improve the performance of the ISAR imaging in the three aspects of transverse calibration, large-angle high-resolution imaging and three-dimensional imaging. Moreover, compared with the conventional target rotation estimation method, the method has high precision, and is easy in engineering realization.

Description

technical field [0001] The present invention relates to the technical field of radar, and more specifically, the present invention relates to a method for estimating rotation of an inverse synthetic aperture radar (ISAR) target based on time-space image sequence analysis. Background technique [0002] Inverse synthetic aperture radar (ISAR) is a microwave imaging technology that can provide two-dimensional images of non-cooperative moving targets (such as aircraft and ships), and enhance the performance of subsequent target recognition, estimation, tracking and precision strikes. The basic principle of ISAR imaging is as follows: the high resolution of the target along the radar line of sight direction (oblique range direction) is obtained by transmitting broadband signals, and the lateral resolution of the target is obtained by coherently accumulating the relative viewing angle changes between the radar and the target; High, ISAR can obtain higher resolution with a small ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 许稼叶春茂彭应宁王秀坛
Owner TSINGHUA UNIV
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