Real beam scanning radar super-resolution imaging method
A super-resolution imaging and scanning radar technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as noise sensitivity, limited angular resolution, and a large amount of scanning data
Active Publication Date: 2014-06-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0006] Aiming at the problem of limited angular resolution encountered in the real beam scanning radar imaging process, the present invention proposes a real beam scanning radar maximum likelihood iterative angle super-resolution imaging method, which solves the need for a large amount of scanning data in the existing real beam angle super-resolution method or noise-sensitive issues, so as to achieve real-beam scanning radar angle super-resolution imaging
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[0069] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2010. The present invention will be further described in detail with regard to specific embodiments below.
[0070] Step 1: For any point target in the imaging area, calculate the distance history of the receiving station and the distance of the transmitting station, and set the simulation parameters of the real beam scanning radar point target. The corresponding radar imaging system parameters are as follows: image 3 shown.
[0071] The imaging scene used in this example is as follows Figure 4 As shown, the dots on the way are 2×3 point targets arranged on the ground. Along the positive direction of the Y axis, the amplitudes are 1, 0.8, and 0.8 in sequence, and the intervals are 6° and 2° respectively; the interval along the X axis is 500m , the initial position coordinates of the radar platform are (0, 0, 10km), the targ...
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The invention discloses a real beam scanning radar super-resolution imaging method. The method particularly includes the steps that a maximum likelihood objective function is built through the statistical characteristics of echo signals, an interference matrix and a power diagonal matrix are imported, and then maximum likelihood solution of the objective function for a covariance matrix is acquired; the functional relationship between the azimuth signal power and the covariance matrix is utilized to conduct iteration, and then calculation accuracy of the covariance matrix and the azimuth signal power is improved. The method well solves the problem that in the scanning imaging mode, angular super-resolution performance is low due to deviation existing in the covariance matrix.
Description
technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a radar angle super-resolution imaging method suitable for real-beam scanning. Background technique [0002] Radar imaging is an all-day and all-weather imaging system. Because it is not affected by weather and other factors, it plays an indispensable role in the fields of marine and hydrological observation, environmental and disaster monitoring, and land / sea tracking and rescue. . [0003] Real-beam scanning radar imaging is a commonly used radar imaging mode. It irradiates specific areas within a certain period of time through mechanical scanning of the antenna and obtains the target position and scattering coefficient information in the area. Improving the angular resolution of the real-beam scanning radar is conducive to improving the target reconnaissance, surveillance, positioning and identification capabilities in the scanning radar detection area, and ...
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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 张寅黄钰林杨建宇邓敏张永超武俊杰查月波李文超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA