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Imaging method for correcting large-scene range migration through missile-borne SAR based on CS algorithm

A technology of distance migration and imaging method, which is applied in complex mathematical operations, reflection/re-radiation of radio waves, instruments, etc., and can solve the problem that the missile-borne SAR range Doppler algorithm is not suitable for wide swath and large scene imaging, etc. Achieve good azimuth focusing effect, improve focusing effect, and ensure the effect of focusing effect

Pending Publication Date: 2022-06-24
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing missile-borne SAR range Doppler algorithm is not suitable for large scene imaging with wide surveying swaths, resulting in large errors in target imaging, and proposes a missile-borne SAR correction based on the CS algorithm. Imaging Method of Scene Distance Migration

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  • Imaging method for correcting large-scene range migration through missile-borne SAR based on CS algorithm
  • Imaging method for correcting large-scene range migration through missile-borne SAR based on CS algorithm
  • Imaging method for correcting large-scene range migration through missile-borne SAR based on CS algorithm

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specific Embodiment approach 1

[0034] Embodiment 1: Combining figure 1 Illustrating this embodiment, the specific process of the imaging method of the CS algorithm-based missile-borne SAR to correct the distance migration of a large scene is as follows:

[0035] Step 1: The radar samples the scene target echoes to obtain the original data, and uses the series inversion method to derive the two-dimensional spectral expression of the echo data; uses MATLAB tools to sample the echo data to obtain the original echoes; the model For missile-borne SAR, the radar is mounted on the missile;

[0036] Step 2, on the original data Perform an azimuthal FFT to convert the raw data from the time domain Transform to Azimuth Doppler Domain get

[0037] The FFT is a fast Fourier transform; is the distance time domain time; t m is the azimuth time domain time; R 0 is the instantaneous distance from the radar to the target; is the azimuth Fourier transformed data of the original data; ΔR is the distance and pos...

specific Embodiment approach 2

[0046] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the radar samples the echoes of the scene targets, obtains the original data, and uses the series inversion method to derive the two-dimensional spectrum representation of the echo data. formula; use MATLAB tool to sample the echo data to obtain the original echo; the model is a missile-borne SAR, and the radar is set up on the missile; the specific process is:

[0047] with t m = The point where the radar platform at time 0 is projected to the ground is the origin O, the radar route direction is the OX direction, the vertical radar route direction is the OY direction, and the OZ direction is perpendicular to the OX direction and the OY direction;

[0048] Let a certain time t m , the slant distance between the radar and the point target P is

[0049]

[0050] Among them, H is the height of the radar platform; V x0 and a x are the velocity and acceleration components of the r...

specific Embodiment approach 3

[0059] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the step 3, the total phase term of the two-dimensional spectrum Φ(f r ,f a ) first-order coefficients in the frequency domain Perform Taylor expansion at ΔR=0 to construct line frequency modulation scaling function H 1 ;

[0060] Will multiply by H 1 Make the targets of all distance units in the scene eliminate the spatial variation characteristics of distance migration, and adjust them to be consistent with the distance migration of the center line of the scene, and obtain

[0061] The specific process is:

[0062]

[0063]

[0064]

[0065] Among them, H 1 is the line frequency modulation scaling function; c is the speed of light, the value is 3 × 10 8 m / s; A(f a ) is the first-order coefficient The constant term of ; B(f a ) is the CS factor; for The data after the distance migration compensation is consistent; f c is the carrier frequency of the LFM si...

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Abstract

The invention discloses an imaging method for correcting large-scene range migration through a missile-borne SAR based on a CS algorithm, and relates to a CS method for correcting large-scene range migration through the missile-borne SAR. The objective of the invention is to solve the problem that the existing missile-borne SAR distance Doppler algorithm is not suitable for wide-swath and large-scene imaging, resulting in a large error in target imaging. The method comprises the following steps of: 1, acquiring original data, and deducing a two-dimensional spectrum expression of echo data by adopting a series inversion method; 2, obtaining data after azimuth Fourier transform of the original data; 3, constructing a line frequency modulation scaling function; obtaining data after consistent compensation; 4, performing range Fourier transform on the data after consistent compensation; 5, performing range migration correction and pulse compression on the result of the step 4, and then performing range inverse Fourier transform; 6, multiplying the result of the step 5 by azimuth pulse pressure and a phase compensation function, and performing azimuth IFFT to obtain an SAR image; the method is applied to the technical field of radar imaging.

Description

technical field [0001] The present invention relates to a CS method for correcting large scene distance migration by missile-borne SAR. Background technique [0002] In the process of imaging the scene with the missile-borne SAR, since the synthetic aperture radar is a wide-band transmission signal of a large array, the scene echo signal will have inevitable coupling in the range dimension and the azimuth dimension, that is, the distance migration in the imaging system, it is The existence of , makes the system response appear as a two-dimensional curve of fast time domain and slow time domain. At the same time, compared with the traditional airborne SAR, the missile-borne platform has more complex motion characteristics: fast speed, non-uniform transformation, and complex changes in the slant range from the radar to the target. [0003] Although the traditional airborne SAR imaging algorithm considers the spatial variability of the target distance in the detection scene of...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41G06F17/14
CPCG01S13/9021G01S7/41G06F17/14
Inventor 王勇钱光照
Owner HARBIN INST OF TECH
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