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Frequency diversity array synthetic aperture radar high resolution and wide swath imaging method

A technology of frequency diversity array and synthetic aperture radar, which is applied in the field of radar, can solve problems such as the inability to realize wide swath scene imaging, and achieve the effects of reducing complexity, simplifying design, and improving spectrum structure

Active Publication Date: 2016-07-20
XIDIAN UNIV
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Problems solved by technology

However, the traditional single-channel SAR system cannot achieve wide swath scene imaging in the high-resolution imaging mode, because the high resolution in the azimuth direction means a large Doppler bandwidth. In order to avoid Doppler ambiguity, sufficient A high pulse repetition frequency (PRF) is used for azimuth sampling. However, a wide swath requires a low pulse repetition frequency (PRF) to ensure no range ambiguity in the swath. requirements, this contradiction is particularly prominent in spaceborne radar

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Embodiment Construction

[0033] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] refer to figure 1 , the application scenario of the present invention is: a high-speed moving low-orbit satellite is used as a radar platform, the platform height is H, and the moving speed is v. The frequency diversity array can be equivalent to a one-dimensional equidistant linear array, the number of array elements is N, the axis of the array is parallel to the direction of radar movement, and the pulse repetition frequency of the array transmitting signal is f r , the transmit carrier frequency of the nth antenna is f n . The antenna beam points to the ground observation scene directly on the side of the array, and the width of the observation scene is the surveying and mapping bandwidth. W g express. The azimuth resolution required by the system is ρ a , the mapping bandwidth is W g , the maximum unambiguous di...

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Abstract

The invention discloses a frequency diversity array synthetic aperture radar high resolution and wide swath imaging method. The purpose of the invention aims at overcoming the problem in the prior art of limited wide swath under high resolution imaging method mode. The method comprises the following steps: 1. designing a frequency increment of a frequency diversity array; 2. the frequency diversity array, in accordance with the frequency increment, determining and transmitting a signal set; 3. the frequency diversity array receiving an echo signal, and successively conducting vector quantization output and receiving a wave beam formation, and obtaining a snapshot vector of the echo signal; 4. conducting range ambiguity resolution on the snapshot vector of the echo signal, and obtaining an echo signal without range ambiguity; and 5. imaging the echo signal without no range ambiguity, and obtaining a high resolution and wide width imaging result of the entire scene. According to the invention, the method can effectively resolve echo signals with range ambiguity in spatial frequency domain, and obtains synthetic aperture radar images with high resolution and wide swath through imaging the echo signals that have range ambiguity resolved. The method is applicable to marine observation and global survey.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a synthetic aperture radar (SAR) high-resolution wide surveying band imaging technology, which can be used for ocean observation and global surveying and mapping. Background technique [0002] Synthetic aperture radar SAR has all-weather, all-weather and long-distance ground imaging capabilities, and has a wide range of requirements and applications in terrain mapping, ocean monitoring, environmental and disaster monitoring and reconnaissance, and airborne / spaceborne synthetic aperture radars are gradually being used Extensive research and application in various countries. On the one hand, many practical applications require high-resolution imaging of observation scenarios, such as ocean and land monitoring, map mapping, and disaster assessment; , ocean observation and global surveying and mapping, etc., wide-swath imaging can shorten the revisit time and greatly improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28G01S7/282G01S7/42G01S13/90
CPCG01S7/2813G01S7/282G01S7/42G01S13/90G01S13/904
Inventor 廖桂生许京伟王成浩兰岚冯阳
Owner XIDIAN UNIV
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