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

A technology of non-uniform sampling and imaging method, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve problems such as inability to effectively eliminate false targets

Inactive Publication Date: 2013-05-15
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 the understanding of the present invention and do not play a limiting role.

[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: Press the echo data obtained by the M channels of the DPC-MAB SAR system figure 1 Way to combine, 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: To the equivalent echo data obtained in step 1 [X r ] Carry out distance pulse compression to get matrix [X rl ];

[0047] Step 3: Determine the equivalent echo data [X r ]'S azimuthal non-uniform sampling time collection {t n =t m +ceil(n / M)PRT,n=0,1,…L-1,m=nmodM}, where t 0 =0,t 1 =d / (2V a ),..., t M-1 =(M-1)d / (2V a ...

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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, and 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 realizes two-dimensional high-resolution imaging through range-direction pulse compression and azimuth-direction synthetic aperture processing. It has been widely used in battlefield reconnaissance, precision guidance, resource detection, terrain mapping and disaster monitoring, and many other military and civilian fields. For conventional SAR, high resolution and wide surveying strip are contradictory, and it is difficult to achieve both at the same time. Multi-phase center azimuth multi-beam (DPC-MAB) mode SAR can effectively solve the contradiction between high resolution and wide surveying band by adopting one-shot and multiple-receive method in azimuth,...

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Application Information

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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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