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Implementation method of high resolution and wide swath spaceborne SAR (Synthetic Aperture Radar) system

An implementation method and high-resolution technology, applied in the field of high-resolution wide-swap spaceborne synthetic aperture radar system, can solve the problem of not being able to obtain ultra-high range resolution, achieve a small system pulse repetition frequency, and avoid sub-band crosstalk , the effect of wide mapping bandwidth

Active Publication Date: 2014-04-16
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the limitation of the transmitted signal bandwidth at the hardware level, this mode cannot obtain ultra-high distance resolution

Method used

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  • Implementation method of high resolution and wide swath spaceborne SAR (Synthetic Aperture Radar) system
  • Implementation method of high resolution and wide swath spaceborne SAR (Synthetic Aperture Radar) system
  • Implementation method of high resolution and wide swath spaceborne SAR (Synthetic Aperture Radar) system

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0028] Firstly, the implementation method of this new high-resolution and wide-swath spaceborne SAR system is given. The flow chart of the implementation method is as follows: figure 1 shown, including the following steps:

[0029] Step S1: In the azimuth direction of the spaceborne synthetic aperture radar, adopt the sliding beamforming mode of multi-transmission and multi-reception, and N sub-apertures transmit N chirp signals with different carrier frequencies, so that the sub-band echoes received by multiple sub-apertures are separated, Perform azimuth preprocessing on the separated sub-band echoes to eliminate spectrum aliasing caused by beam scanning and antenna multi-channel structures.

[0030] Step S2: performin...

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Abstract

The invention discloses an implementation method of a high resolution and wide swath spaceborne SAR (Synthetic Aperture Radar) system. The implementation method comprises adopting the sliding bunching mode that multiple-input and multiple-output are performed and N different carrier frequencies of linear frequency modulation signals are transmitted from N sub-apertures in the azimuth direction of a spaceborne SAR to enable sub-band echoes which are received by the plurality of sub-apertures to be separated, performing azimuth pretreatment on the separated sub-band echoes and eliminating the spectrum overlapping caused by the beam scanning and the antenna multi-channel structure; performing range sub-band composition on signals after the azimuth pretreatment to obtain a sub-band composition signal and obtain the range high resolution, wherein the bandwidth of the sub-band composition signal is N times of the bandwidth of the single linear frequency modulation signal; achieving residual focusing of the sub-band composition signal through an RMA (Range Migration Algorithm) to obtain a final high resolution radar image.

Description

technical field [0001] The present invention relates to a new type of high-resolution wide-swap spaceborne synthetic aperture radar (SAR) system, in particular to a spaceborne synthesis using a multi-transmit and multi-receive sliding beamforming mode in the azimuth direction and a sub-band synthesis technology in the distance direction Aperture radar system. Background technique [0002] The main problem faced by spaceborne synthetic aperture radar is how to improve the resolution and mapping bandwidth at the same time. In the traditional strip mode, there is an inherent contradiction between azimuth resolution and range mapping bandwidth. Spotlight synthetic aperture radar can improve the azimuth resolution, but the azimuth mapping bandwidth is limited by the beam width; TopsSAR and ScanSAR can increase the range mapping bandwidth, but at the cost of reducing the azimuth resolution. [0003] At present, the commonly used method to solve this inherent contradiction is the...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/34G01S13/9011G01S13/90G01S7/42G01S13/9047
Inventor 罗绣莲王宇邓云凯徐伟罗运华郭磊王伟陈倩
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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