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Double-station frequency-modulation continuous wave synthetic aperture radar imaging method

A synthetic aperture radar, frequency modulated continuous wave technology, applied in the field of radar

Active Publication Date: 2014-08-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Literature "Y.Liu, Y.K.Deng, R.Wang, and O.Loffeld, Bistatic FMCW SAR signal model and imaging approach, Aerospace and Electronic Systems, IEEE Transactions on, vol.49, no.3, pp.2017–2028, 2013." In the case of considering the instantaneous slant range change, a two-station FM continuous wave SAR range-Doppler domain imaging algorithm was proposed, but this method only corrected the range walking and ignored the influence of range bending

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  • Double-station frequency-modulation continuous wave synthetic aperture radar imaging method
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[0097] The present invention mainly adopts the mode of simulation experiment to verify, and the simulation verification platform is Matlab2013.

[0098] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0099] The schematic flow chart of the dual-station FM continuous wave SAR imaging data processing method of the present invention is as follows figure 1 As shown, the specific process is as follows:

[0100] Step 1: Initialize the parameters of the imaging system.

[0101] The target scene adopted by the implementation of the present invention is as Figure 4 As shown, the black dots in the figure are 3×5 15-point targets arranged on the ground. These 15 points are separated by 75m along the x direction (cutting the track) and 50m apart along the y direction (along the track). The platform moves along the y-axis.

[0102] The location coordinates of the transmitting station are (-800,-8...

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Abstract

The invention discloses a double-station frequency-modulation continuous wave synthetic aperture radar imaging method which particularly includes the steps of conducting dechirp processing on echo signals, removing residual video phases, conducting distance direction time-frequency replacement and azimuth Fourier transformation, conducting rough matching focusing to remove space invariant items of the phases, and conducting wave number domain transformation to remap the distance direction frequency. By means of the double-station frequency-modulation continuous wave synthetic aperture radar imaging method, instantaneous slant distance changes caused by continuous motion of a transmitting-receiving station within the pulse duration time are considered, Doppler parameters in echoes, distance migration and high-order coupling linear space variant characteristics are adopted, point-target echo two-dimensional frequency spectrum airspace linearization is achieved, and the point-target echo two-dimensional frequency spectrum airspace problem is solved.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to an imaging method of a bi-station FM continuous wave SAR in a synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology. Background technique [0002] Synthetic aperture radar is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. SAR has played an increasingly important role in the fields of terrain mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, resource exploration, and detection of crustal changes. [0003] Dual-station SAR is a new radar system. The system’s transmitting station and receiving station are placed on different platforms. The characteristics of separate sending and receiving make it have many outstanding advantages and characteristics, such as ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S7/32G01S13/904G01S13/9058
Inventor 武俊杰包毅黄钰林杨建宇李中余
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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