Inverse synthetic aperture radar imaging method based on time-phase derivative distribution

A technology of inverse synthetic aperture and radar imaging, applied in the field of radar, can solve the problem of not being able to produce high-quality images, and achieve the effect of small amount of calculation and high parameter estimation accuracy

Inactive Publication Date: 2011-04-13
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the imaging method adopted by the prior art for complex moving targets (due to the complex time-frequency characteristics of the echo signals of its scatteri

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Embodiment Construction

[0038] The specific implementation method of the present invention is as follows figure 1 As shown, the process is as follows:

[0039] Firstly, motion compensation is performed on the echo signal, and then an echo signal model of the target is established. In the present invention, the echo signal is described as a multi-component polynomial phase signal model. The time-phase derivative distribution method is used to estimate the parameters of the multi-component polynomial phase signal, and then the distance-instantaneous Doppler imaging method is used to obtain the transient ISAR image of the target.

[0040] 1. Establishment of echo signal model

[0041] according to figure 2 The radar sight coordinate system shown, assuming that the echo has been motion compensated, the radar sight unit vector is r, and the synthetic rotation vector of the maneuvering target is Ω, the radar sight coordinate system xyz is established. The z-axis coincides with the r-axis, so that the x-axis li...

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Abstract

The invention discloses an inverse synthetic aperture radar imaging method based on time-phase derivative distribution. Under the situation of very complicated object motion, the Doppler frequency of echo signals of scatter points is time-varying, and an image obtained by using a traditional distance-Doppler imaging method is vague at the moment so that an object is difficult to identify. In the invention, the echo signals of the scatter points are described to be multi-component quartic-phase signals, and a parameter evaluation method based on the time-phase derivative distribution is proposed in specific to the situation of single-component signals; and a parameter evaluation method in which product type time-phase derivative distribution is adopted and a clean technology is combined, is proposed in specific to the situation of multi-component signals. Finally, a transient image with a clear object is obtained by combining a distance-transient Doppler imaging method.

Description

Technical field [0001] The invention belongs to the field of radar technology, and particularly relates to an inverse synthetic aperture radar imaging method. Background technique [0002] In inverse synthetic aperture radar imaging, the imaging method with the smallest amount of calculation and the most commonly used so far is the distance-Doppler algorithm. The longitudinal range resolution depends on the radar transmitting broadband signals, and the lateral resolution depends on the Doppler of the target rotation. Frequency, first through motion compensation to make the target a turntable target with the "self-focusing point" at the axis, and then perform imaging processing. The entire imaging process can be understood as: using the different time delays of the sub-echoes of the scattering points on the target and the different Doppler frequencies of the sub-echoes when the target rotates, showing the intensity of the target scattering points on the distance-Doppler plane Dis...

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
Inventor 王勇张云姜义成
Owner HARBIN INST OF TECH
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