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DPC-MAB SAR imaging method based on non-uniform sampling

A non-uniform sampling and imaging method technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problem that false targets cannot be effectively eliminated

Inactive Publication Date: 2014-07-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, this traditional DPC-MAB SAR imaging method can only achieve accurate imaging of the target when the reconstructed uniformly sampled signal satisfies the Nyquist sampling rate, and cannot effectively eliminate false targets in the case of undersampling

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  • DPC-MAB SAR imaging method based on non-uniform sampling
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  • DPC-MAB SAR imaging method based on non-uniform sampling

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Embodiment Construction

[0043] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be pointed out that the described embodiments are only intended to facilitate understanding of the present invention and do not serve as any limitation.

[0044] A DPC-MAB SAR imaging method based on non-uniform sampling, the specific implementation steps of the method are as follows:

[0045] Step 1: The echo data obtained by the M channels of the DPC-MAB SAR system are divided into figure 1 Combined in different ways, the combined echo data is L×N r The matrix [X r ], which is equivalent to conventional single-channel SAR echo data;

[0046] Step 2: For the equivalent echo data obtained in step 1 [X r ] to perform pulse compression in the distance direction, and obtain the matrix [X rl ];

[0047] Step 3: Determine the equivalent echo data [X r ] azimuth-period non-uniform sampling time set {t n =t m +ceil(n / M)PRT,n=0,1,...L-1...

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Abstract

The invention discloses a DPC-MAB SAR imaging method based on non-uniform sampling and belongs to the field of synthetic aperture radar signal processing. The DPC-MAB SAR imaging method based on the non-uniform sampling aims at the problem of azimuth cycle non-uniform sampling problem faced by a DPC-MAB SAR system, echo data of M channels is combined and is changed in an equivalent mode to be conventional single-channel SAR echo data to carry out distance-direction pulse compression, each row of simplified fraction order Fourier transform of the equivalent echo data is calculated according to cycle non-uniform sampling points, and imaging of an target object is achieved through rebuilding of simplified fraction order Fourier transform spectrum of a uniform sampling signal. The DPC-MAB SAR imaging method based on the non-uniform sampling can achieve accurate imaging of the target object under the condition of satisfying Qwest sampling rate. Compared with a traditional imaging mode, the DPC-MAB SAR imaging method based on the non-uniform sampling can further achieve target imaging under an under-sampled condition, and solves a DPC-MAB SAR imaging problem based on non-uniform sampling under low sampling rate.

Description

technical field [0001] The invention relates to a DPC-MAB SAR imaging method based on non-uniform sampling, which belongs to the field of synthetic aperture radar (SAR) signal processing. Background technique [0002] Synthetic Aperture Radar (SAR) is an important imaging system that can operate all-weather and all-weather. It achieves two-dimensional high-resolution imaging through pulse compression in the range direction and synthetic aperture processing in the azimuth direction, and has been widely used in many military and civilian fields such as battlefield reconnaissance, precision guidance, resource detection, terrain mapping and disaster monitoring. For conventional SAR, high resolution and wide swath are contradictory, and it is difficult to realize both at the same time. The multi-phase central azimuth multi-beam (DPC-MAB) mode SAR can effectively solve the contradiction between high resolution and wide swath by adopting the method of one transmission and multiple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 赵娟陶然白霞辛怡史若凡
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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