Azimuth periodic sampling data sparse SAR (Synthetic Aperture Radar) imaging method and device based on mixed norm

A periodic sampling and data sparse technology, which is applied to measurement devices, radio wave reflection/re-radiation, and re-radiation, can solve problems such as reconstruction failure, inability to suppress azimuth blur, ghosting, and loss, and achieve suppression of azimuth ambiguity and ghosting effect

Pending Publication Date: 2021-10-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology

[0004] Purpose of the invention: For periodic sampling data, the traditional matched filter method cannot suppress azimuth ambiguity and ghosting, which will lead to reconstruction failure. Therefore, the present invention proposes a sparse SAR imaging method and device based on mixed norm-based periodic sampling data in azimuth direction. To solve the problem of periodic missing of sampling data and ensure the quality of SAR imaging based on downsampling data

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  • Azimuth periodic sampling data sparse SAR (Synthetic Aperture Radar) imaging method and device based on mixed norm
  • Azimuth periodic sampling data sparse SAR (Synthetic Aperture Radar) imaging method and device based on mixed norm
  • Azimuth periodic sampling data sparse SAR (Synthetic Aperture Radar) imaging method and device based on mixed norm

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[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0066] The present invention proposes a sparse SAR imaging method based on mixed norm azimuth to periodic sampling data, such as figure 1 As shown, it specifically includes the following steps:

[0067] Step 1: Based on the collected azimuth periodic sampling data, construct an unambiguous sparse SAR imaging model.

[0068] Let the azimuth frequency of the main Doppler spectrum be f η , the Doppler frequency of the azimuth ambiguous region caused by periodic sampling in azimuth can be expressed as:

[0069] f a = f η +i·PRF,i∈Zandi≠0 (1)

[0070] Among them, PRF is the pulse repetition frequency, and i represents the i-th azimuth ambiguous area.

[0071] The Doppler frequency in the ghost area can be expressed as:

[0072]

[0073] Among them, N t is the number of transmitted pulses, N τ is the number of received pulses, and k represents the kth g...

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Abstract

The invention discloses an azimuth periodic sampling data sparse SAR imaging method and device based on a mixed norm. The method comprises the steps: firstly constructing an unambiguous sparse SAR imaging model based on collected azimuth periodic sampling data; secondly, reconstructing an observation scene is realized by solving a mixed norm regularization problem; and finally, realizing high-precision reconstruction of the observation scene through iterative recovery. According to the method, accurate reconstruction is carried out based on azimuth periodic sampling data, azimuth ambiguity and ghosting can be effectively inhibited, and a high-quality non-ambiguity sparse SAR image is obtained.

Description

technical field [0001] The invention belongs to the fields of sparse signal processing and microwave imaging, and in particular relates to a method and device for sparse SAR imaging of azimuth-period sampling data based on mixed norms. Background technique [0002] Synthetic Aperture Radar (SAR for short) is an active radar mounted on a mobile platform. Compared with traditional optical imaging, SAR has all-day and all-weather observation capabilities, so it is widely used in military reconnaissance, agriculture, disaster monitoring and other fields. In order to achieve low-cost, high-resolution, wide-swath SAR imaging, a new concept of spaceborne miniature synthetic aperture radar system was proposed and applied in practice, which collects azimuth periodic sampling data through alternate transmitting and receiving operations. Range-Doppler algorithm and Chirp-Scaling algorithm are commonly used SAR imaging algorithms based on matched filter. However, since the collected a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9021
Inventor 毕辉殷严杰卢兴梦宋宇凡尹杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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