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Moving target detection method and imaging method for near space slow platform SAR (Synthetic Aperture Radar)

A moving target detection and near space technology, which is applied in the field of SAR moving target detection and imaging on slow platforms in near space, and can solve the problems of inability to detect slow moving targets and difficult imaging.

Active Publication Date: 2015-04-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0007] The purpose of the present invention is to study and design a NSS-SAR moving target detection and imaging method for the defects in the background technology, so as to overcome the problems of difficult imaging of traditional spaceborne and airborne SAR moving targets and the inability to detect slow moving targets

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  • Moving target detection method and imaging method for near space slow platform SAR (Synthetic Aperture Radar)
  • Moving target detection method and imaging method for near space slow platform SAR (Synthetic Aperture Radar)
  • Moving target detection method and imaging method for near space slow platform SAR (Synthetic Aperture Radar)

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Embodiment Construction

[0073] The present invention mainly adopts the mode of simulation experiment to verify, and the simulation verification platform is Matlab2012. The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0074] The schematic flow chart of the method for detecting moving targets in the near-space slow platform SAR of the present invention is shown in the appendix figure 1 As shown, the specific process is as follows:

[0075] Step 1: Initialize the parameters of the imaging system.

[0076] The geometric structure diagram of NSS-SAR used in this embodiment is as follows figure 2 As shown, the system parameter table is as follows image 3 As shown, the target scenario adopted is as attached Figure 4 as shown,

[0077] Figure 4 The black dots in are the 3×3 9 point targets arranged on the ground, where P m One point is a moving target, and the other points are stationary targets. These nine po...

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Abstract

The invention discloses a moving target detection method and an imaging method for a near space slow platform SAR (Synthetic Aperture Radar). In the detection method disclosed by the invention, the characteristics of low platform speed and smaller ground static clutter Doppler broadening of the near space slow platform SAR are utilized, and separation of a moving target from static clutter is realized by designing a Doppler filter in a Doppler domain, so that the problem of difficulty in separating dynamic and static clutters of the SAR in moving target imaging is solved. According to the imaging method disclosed by the invention, moving target echo is extracted after separation of dynamic and static clutters and moving target detection, one-order keystone conversion is combined with a variable-resolution Doppler frequency modulation estimation method, and range walk correction is completed under the condition that the speed of the moving target is unknown, so that the problem of difficulty in range walk correction of the moving target echo is solved. The methods have the advantages that rapid moving targes can be detected and imaged; and the methods are suitable for detecting and imaging slow moving targets.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a method for detecting and imaging a moving target of a slow platform SAR near space in the imaging technology of Synthetic Aperture Radar (SAR). Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in military reconnaissance, topographic mapping, vegetation analysis, ocean and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of crustal changes. [0003] Near space SAR is a new radar system. Near space refers to a new airspace between aviation and aerospace located 20-100km from the ground. The characteristics of near space make near space SA...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 李中余杨海光易青颖武俊杰黄钰林杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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