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Strabismus bias phase center position multi-beam satellite-bone synthetic aperture radar (SAR) imaging method

A technology of offset phase center and imaging method, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc. Problems such as non-uniform sampling

Inactive Publication Date: 2014-12-31
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a squint offset phase center azimuth multi-beam space-borne SAR imaging method to solve the problem of insufficient azimuth sampling rate in the squint offset phase center azimuth multi-beam space-borne SAR mode in the prior art, Problems such as large distance migration of echo data and non-uniform sampling of multiple beams in azimuth

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  • Strabismus bias phase center position multi-beam satellite-bone synthetic aperture radar (SAR) imaging method
  • Strabismus bias phase center position multi-beam satellite-bone synthetic aperture radar (SAR) imaging method
  • Strabismus bias phase center position multi-beam satellite-bone synthetic aperture radar (SAR) imaging method

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Embodiment Construction

[0047] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] figure 1 It is a schematic diagram of the working principle of the multi-beam spaceborne SAR mode with squint bias phase center and azimuth, taking three beams in azimuth as an example, figure 2 It is a schematic diagram of the two-dimensional spectrum aliasing of the echo data of the squint spaceborne SAR mode.

[0049] Such as figure 1 As shown, here is an example of three beams in azimuth, where the azimuth antenna is evenly divided into three sub-apertures, the middle aperture Tx / Rx is used to transmit and receive radar signals, and the remaining two sub-apertures Rx are only used to receive radar echo signals . Assume that the flight speed of the satellite platform is v s , the squint angle during spaceborne SAR imaging is θ sq , the slant distance from the target to the phase center of the transmitting antenna at the moment ...

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Abstract

The invention discloses a strabismus bias phase center position multi-beam satellite-bone synthetic aperture radar (SAR) imaging method. The method comprises the following steps: corresponding phase compensation is conducted to echo data received by beams of each position by utilizing an azimuth phase compensation function H1, n (f, t); the Doppler frequency spectrum of the echo data after the phase compensation are rebuilt in a distance-Doppler domain by utilizing a position reconstruction filter group P (fa), and Doppler course of a target echo signal is recovered by utilizing a spectrum reduction function H2 (fr, t); and focus imaging is conducted to the echo data by utilizing an improved random multiple access (RMA) algorithm. According to the strabismus bias phase center position multi-beam satellite-bone SAR imaging method, the Doppler course of the echo signal is adjusted through position preprocessing operation, the problem that sampling rate of position signals is insufficient is solved, the Doppler course is rebuilt through strabismus position multi-beam signals, and the problem that position multichannel is not sampled uniformly is solved. Long-distance migration correction and focus imaging are achieved eventually through the RMA algorithm which is based on improved Stolt interpolation operation.

Description

technical field [0001] The invention belongs to the field of space-borne synthetic aperture radar signal processing, in particular to a multi-beam space-borne SAR imaging method with squint bias phase center azimuth. Background technique [0002] The spaceborne synthetic aperture radar (SAR) has high maneuverability in the squint mode. By changing the antenna beam pointing, the radar can pre-image the side and front targets and re-image the side and rear targets. However, with the increase of the antenna azimuth beam pointing angle, the azimuth resolution of the radar image will deteriorate accordingly. The offset phase center and azimuth multi-beam technology in the prior art exchanges the reduction of the azimuth and time-domain sampling rate by increasing the number of air-space sampling channels, which can greatly improve the high-resolution and wide-ranging mapping capability of the spaceborne SAR system. In other words, the offset phase center azimuth multi-beam techn...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 黄平平徐伟侯婷
Owner INNER MONGOLIA UNIV OF TECH
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