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Bistatic forward-looking SAR wave number domain imaging method based on shift variable configuration

A bi-base forward-looking and imaging method technology, applied in the field of radar, can solve the problems of low imaging precision and large amount of calculation, and achieve the effect of improving the focusing effect, solving two-dimensional space variation, and avoiding zero padding in the azimuth direction

Active Publication Date: 2021-04-13
XIDIAN UNIV
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Problems solved by technology

This method has low imaging accuracy and a large amount of computation, and is not suitable for double-base models with acceleration

Method used

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  • Bistatic forward-looking SAR wave number domain imaging method based on shift variable configuration
  • Bistatic forward-looking SAR wave number domain imaging method based on shift variable configuration
  • Bistatic forward-looking SAR wave number domain imaging method based on shift variable configuration

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Embodiment Construction

[0028] The embodiments and effects of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] refer to figure 1 , the bistatic forward-looking SAR wavenumber domain imaging method based on the shift configuration of the present invention, the implementation steps are as follows:

[0030] Step 1, calculate and acquire the two-dimensional frequency spectrum of the echo signal.

[0031] (1.1) The transmitting signal is a chirp signal. For convenience of description, the present invention does not specifically analyze the change of the window function in the echo signal, so the receiver obtains the baseband echo signal s after frequency mixing ta (t τ ,t η ), expressed as follows:

[0032] the s ta (t τ ,t η )=exp(jπγ(t τ -τ(t η )) 2 )exp(-j2πf c τ(t η ))

[0033] In the formula, γ is the modulation frequency of the linear frequency modulation signal, t τ is the fast time, t η is the slow time, f c is ...

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Abstract

The invention discloses a bistatic forward-looking SAR (Synthetic Aperture Radar) wave number domain imaging method based on a shift variable configuration, and mainly solves the problems of difficulty in realizing accurate focusing of a large-scene target in a curve track state and large computation burden in the prior art. According to the implementation scheme, the method comprises the steps of: firstly, obtaining a two-dimensional frequency spectrum of a target echo signal; performing distance compression compensation correction on the two-dimensional frequency spectrum; designing an interpolation factor to interpolate the signal subjected to distance compression compensation correction; carrying out azimuth space-variant filtering correction on the interpolated signal; and carrying out azimuth factor reconstruction correction focusing on the signal subjected to azimuth space-variant filtering correction to obtain a two-dimensional imaging image. The method has the advantages of being high in imaging accuracy and small in computation burden, and can be used for high-resolution imaging of the shift-variable-configuration double-base forward-looking SAR.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a bistatic forward-looking SAR imaging method, which can be used for high-resolution imaging of the bistatic SAR under a shift-variable geometric configuration. Background technique [0002] One of the important applications of bistatic synthetic aperture radar SAR is bistatic forward-looking SAR. In this configuration, the positions of the transceiver platforms are separated, and the forward-looking receiver receives target echoes. In its forward-looking area, the two-dimensional spatial resolution is orthogonal. Or approximately orthogonal to achieve forward-looking two-dimensional imaging. Bistatic forward-looking SAR has great potential advantages in high-resolution forward-looking two-dimensional imaging, and can be used for aircraft blind landing and forward-looking imaging in complex terrain backgrounds. However, in the above situation, it has three-dimensional veloci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9043G01S13/9011
Inventor 李亚超张廷豪王宇张磊郭亮黄平平左磊熊涛
Owner XIDIAN UNIV
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