Array Antenna SAR Polar Coordinate Overlapping Subaperture Imaging Method
A technology of overlapping sub-apertures and array antennas, applied in radio wave measurement systems, radio wave reflection/re-radiation, and re-radiation, can solve problems such as inability to compensate for wavefront bending errors, and achieve high-precision imaging processing, Realize the effect of imaging processing and small amount of calculation
Active Publication Date: 2016-05-18
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0003] However, the applicant found that the above-mentioned array SAR polar coordinate imaging method performs Fraunhofer approximation on the distance history, which cannot compensate the wavefront bending error, and the imaging accuracy is greatly affected by the wavefront bending, especially when the imaging scene is large and the surveying distance is relatively large. In the near case, the effect of wave front bending is more obvious
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[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values within acceptable error margins or design constraints.
[0023] The invention provides an array antenna SAR polar coordinate overlapping sub-aperture imaging method. This method is proposed for the array antenna SAR...
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The invention provides an antenna array SAR polar coordinate overlapped sub-aperture imaging method for a two-dimension SAR imaging system consisting of array antennas. The method is suitable for an array antenna radar system of which the transmitting signal is a Chirp signal or an SFCW signal. The method comprises the steps of completing range frequency matched filtering, carrying out Polar Formatting transform to represent an observation scene object in a polar coordinate system, completing range imaging through range Fourier transform, and then completing high-precision wave-front curvature compensation and azimuth imaging processing through overlapped sub-aperture processing in the azimuth direction so as to obtain a high-precision two-dimension image.
Description
technical field [0001] The invention relates to the technical field of radar imaging and signal processing, in particular to an array antenna SAR polar coordinate overlapping sub-aperture imaging method. Background technique [0002] In a conventional SAR imaging system, to achieve high resolution in azimuth, it is necessary to increase the system PRF, but the improvement of PRF brings great challenges to the system implementation. The array SAR imaging system uses the physical array to realize the fast switching of receiving and receiving between array elements instead of the platform movement to form a synthetic aperture, which can reduce the system PRF requirements. Array SAR imaging system has a very broad application prospect in moving target detection and high resolution imaging system. At present, the imaging methods of the array antenna SAR imaging system mainly include the ω-k algorithm, the back projection algorithm, etc. In the process of implementing the present...
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IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/90G01S13/9011
Inventor 王彦平彭学明洪文吴一戎谭维贤
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI