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Processing method for imaging two-dimensional missing data with high-resolution bunching SAR

A technology with high resolution and missing data, applied in the field of radar, it can solve the problems of unsatisfactory imaging quality, reduce the burden of data transmission and storage, and achieve the effect of high-resolution imaging

Active Publication Date: 2017-06-13
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

But the final image quality is not ideal

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  • Processing method for imaging two-dimensional missing data with high-resolution bunching SAR
  • Processing method for imaging two-dimensional missing data with high-resolution bunching SAR
  • Processing method for imaging two-dimensional missing data with high-resolution bunching SAR

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0028] figure 1 The data acquisition space model of spotlight SAR is given. Among them, P is any point in the illuminated scene, and the coordinates are (x t ,y t ,z t ). The scene center O is located at the origin of the coordinates, and the aircraft is at a constant speed v a and altitude H to fly along the X axis. At any azimuth sampling time t, the instantaneous distances from the radar antenna phase center to the scene center and point P are R a (t) and R t (t), the instantaneous azimuth and elevation angles are θ and φ, respectively.

[0029] The frequency modulation slope of the radar transmission is K, and the carrier frequency is f c The linear frequency modulation signal of , after being reflected by the target, the radar receives the echo signal s r (τ,t) is

[0030]

[0031] Among them, σ is the complex reflection coeffici...

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Abstract

The invention discloses a processing method for imaging two-dimensional missing data with high-resolution bunching SAR. In an actual data collecting process, air turbulence, radio frequency band interference and other factors may cause data lost at a certain frequency point or certain position, at the moment, distortion, fuzziness, aliasing and other phenomena of a point target response function inevitably exist in a SAR image by adopting an FFT method, and the subsequent target identification and detection work are influenced. Regarding the problem, matrix complete theory-based bunching SAR missing data imaging is provided; missing-contained echoed data is demodulated to remove quadratic phase in an echo signal; then, complete data is recovered by utilizing the matrix complete theory, and imaging is realized by utilizing two-dimensional IFFT of the recovered complete data. Compared with an existing echo imaging algorithm by utilizing missing-contained data, the method has the advantages that the situation of two-dimensional data missing is taken into consideration, and the resolution the same as bunching SAR is realized.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a high-resolution spotlight SAR two-dimensional missing data imaging processing method. Background technique [0002] Airborne spotlight synthetic aperture radar (Synthetic Aperture Radar, SAR) is an advanced high-resolution two-dimensional remote sensing imaging working mode. The spotlight SAR radar antenna always illuminates the target area during aperture synthesis, increasing the coherent accumulation time, thereby improving the azimuth resolution. Then, in the actual data collection process, factors such as air disturbance and wireless frequency band interference may cause data loss and damage at certain frequency points or certain sampling locations. At this time, the reconstruction of SAR images by FFT methods will inevitably have distortion, blurring and aliasing of the point target response function, which will affect the subsequent target recognition and detection work....

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9052
Inventor 王昕赵贝
Owner NANJING UNIV OF POSTS & TELECOMM
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