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Imaging method of missile-borne large-squint small-aperture multichannel SAR (Synthetic Aperture Radar)

An imaging method and multi-channel technology, applied in the directions of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problems of signal spectrum nonlinearity and Doppler spectrum aliasing, etc., to reduce errors, Good effect and effect of application value

Pending Publication Date: 2021-12-07
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, combined with the large squint and small aperture of the maneuvering platform, the channel pointing vector in multi-channel SAR is space-varying and the angle between the platform velocity vector is also space-varying, which will lead to the nonlinearity and multi-channel signal spectrum of each channel. The Problem of Puler Spectrum Aliasing

Method used

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  • Imaging method of missile-borne large-squint small-aperture multichannel SAR (Synthetic Aperture Radar)
  • Imaging method of missile-borne large-squint small-aperture multichannel SAR (Synthetic Aperture Radar)
  • Imaging method of missile-borne large-squint small-aperture multichannel SAR (Synthetic Aperture Radar)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Please refer to the collection figure 1 and figure 2 , figure 1 It is a block flow diagram of a missile-borne high squint small aperture multi-channel SAR imaging method provided by an embodiment of the present invention; figure 2 It is a schematic flowchart of a missile-borne high squint small aperture multi-channel SAR imaging method provided by an embodiment of the present invention. As shown in the figure, the imaging method of this embodiment includes:

[0117] S1: Establish a multi-channel high squint concentric circle slant distance model;

[0118] In this embodiment, the instantaneous slant distance of the multi-channel high squint concentric circle slant distance model includes the fourth-order Taylor series of array center slant distance and the second-order Taylor series of multi-channel difference.

[0119] See image 3 , image 3 It is a schematic diagram of a high oblique multi-channel concentric circle slant distance model provided by an embodimen...

Embodiment 2

[0266] In this embodiment, a simulation experiment is carried out to verify the imaging method of the missile-borne high squint and small aperture multi-channel SAR in the first embodiment.

[0267] 1. Simulation conditions

[0268] The simulation parameters of this experiment are shown in Table 1, the range and azimuth widths are 3km and 6km respectively, and the distribution of point targets is as follows Figure 6 as shown, Figure 6 It is a schematic diagram of a simulated target distribution provided by an embodiment of the present invention.

[0269] Table 1 SAR simulation parameters

[0270]

[0271]

[0272] 2. Simulation content and result analysis

[0273] Simulation 1:

[0274]See Figure 7 , Figure 7 It is a schematic diagram of the analysis of the simulation target distance migration correction result provided by the embodiment of the present invention. Figure 7 The figure on the left in the middle represents the result of the distance migration cor...

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Abstract

The invention relates to an imaging methodof a missile-borne large-squint small-aperture multi-channel SAR, and the method comprises the steps: firstly compensating a scene center non-space-variant multi-channel phase difference in a distance frequency domain, then compensating a space-variant channel phase difference item in a distance time domain, carrying out the reconstruction of a multi-channel signal in a distance time domain azimuth frequency domain so as to eliminate blur existing in multiple channels; In a two-dimensional frequency domain, distance migration correction is carried out, a target range focusing signal is obtained through improved Stolt interpolation, meanwhile, aliasing of the signal in an azimuth time domain is eliminated through azimuth time spectrum compression, space-variant characteristics of Doppler parameters are eliminated through frequency domain nonlinear scaling, and azimuth focusing is completed through the SPECAN technology. The method can better adapt to a high-maneuverability movement track with multiple channels in real time, and solves the problem that joint processing cannot be carried out due to phase difference between the channels.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an imaging method for a missile-borne high-squint small-aperture multi-channel SAR. Background technique [0002] SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) is a practical imaging radar that can work all-weather and all-weather. It has been widely used in ground scene observation, ocean remote sensing and many other aspects. With the development of synthetic aperture radar, SAR has also been applied to many new platforms, such as missiles and fighter jets. Due to the characteristics of various orbits, early image acquisition and real-time imaging, high squint SAR is also widely used on high-speed maneuvering platforms. [0003] In the case where the actual resolution requirement is not high, the echo signal in a small aperture can be used for imaging to improve real-time performance, but when the small aperture SAR is applied to a wide-ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 邢孟道侯雅昕李宁孙光才
Owner XIDIAN UNIV
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