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Scanning radar angle super-resolution imaging method

An imaging method and angular super-resolution technology, which can be applied to instruments, measuring devices, and re-radiation, and can solve the problem of low angular resolution of radar images

Active Publication Date: 2014-01-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

This method breaks through the limitation of radar antenna parameters on the angular resolution of radar images, solves the problem of low angular resolution of radar images caused by the ill-conditioned existing angular super-resolution imaging methods, and realizes scanning radar angular super-resolution imaging

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Embodiment Construction

[0069] The present invention uses simulation experiments to demonstrate the feasibility and effectiveness of the proposed radar angle super-resolution method. All steps and conclusions of the present invention are verified correctly on the Matlab2012 simulation platform, and the detailed operation steps for implementing the method of the present invention are provided below.

[0070] Since the Poisson distribution function is used to describe the likelihood function relationship between the target and the echo, the target function is expressed as a nonlinear function in mathematics; the use of the Laplace distribution function to describe the prior information of the target makes the target function contain irrelevant micro l 1 Norm, so that the gradient-based linear algorithm cannot achieve the solution of the global minimum of the objective function. The solution of the present invention is to mathematically characterize the radar angle super-resolution imaging as a solutio...

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Abstract

The invention discloses a scanning radar angle super-resolution imaging method. The scanning radar angle super-resolution imaging method comprises the following steps that a backward model for real beam scanning radar angle super-resolution imaging is established according to the Bayesian theory, the likelihood function relationship between a target and an echo and prior information of the target are respectively expressed through the Poisson distribution and the Laplace distribution in the model, radar angle super-resolution imaging is expressed as a posterior probability problem existing between the target and the echo, finally, according to the convex optimization theory, based on the nonlinear optimization method and approximate treatment, the target information corresponding to the maximum posterior probability is solved, and radar angle super-resolution imaging is achieved through target information reconstruction. By the adoption of the scanning radar angle super-resolution imaging method, super resolution of multiple targets in a real beam can be achieved.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, in particular to a super-resolution method for forward-looking scanning angles of airborne pulse Doppler radars. technical background [0002] Radar has the ability to work all-weather and all-weather, and plays an important role in civilian and military fields such as earth observation, aircraft landing, and target recognition. [0003] Scanning radar means that the radar beam scans the detected area uniformly or non-uniformly in azimuth. Through the time sequence relationship of the radar antenna beam passing through the target in the scene, the echo signal is processed to obtain the scattering information of the target in the spatial azimuth, so as to achieve accurate detection. Super-resolution imaging of the probed area. Since the scanning radar only changes the way the radar beam illuminates the ground, the method of signal processing is used to realize radar angle super-resolution i...

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S7/41G01S13/89
Inventor 查月波黄钰林夏永红张寅武俊杰杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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