Spaceborne-airborne bistatic synthetic aperture radar (SA-BiSAR) imaging method

A technology of synthetic aperture radar and imaging method, applied in the field of radar

Inactive Publication Date: 2012-01-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] In order to overcome the deficiency that the existing imaging technology cannot be effectively applied to the SA-BiSAR system, the present invention provides a synthetic aperture radar imaging method suitable for a star-machine joint bistatic system, which uses the imaging idea of ​​the RD algorithm to realize focusing processing, and then Then correct the distortion in the image, which is characterized by fast and efficient imaging of SA-BiSAR

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  • Spaceborne-airborne bistatic synthetic aperture radar (SA-BiSAR) imaging method
  • Spaceborne-airborne bistatic synthetic aperture radar (SA-BiSAR) imaging method
  • Spaceborne-airborne bistatic synthetic aperture radar (SA-BiSAR) imaging method

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Embodiment Construction

[0064] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0065] Step 1. Generate the simulation data of the satellite-machine joint bistatic synthetic aperture radar. The system parameters required for the simulation are as follows: figure 2 shown.

[0066] Step 2. Define the SAR scene space and initialize the imaging system parameters; select the unit vector parallel to the velocity direction of the satellite platform and within the ground plane as the first coordinate base of the SAR scene space Select the unit vector perpendicular to the first coordinate base as the second coordinate base of the SAR scene space

[0067] The system parameters chosen for initializing the satellite-aircraft joint bistatic SAR imaging method are consistent with those provided in step 1.

[0068] Step 3. The original data compression of th...

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Abstract

The invention provides a spaceborne-airborne bistatic synthetic aperture radar (SA-BiSAR) imaging method. On the basis of the characteristics that the platform height difference and speed difference of a spaceborne-airborne bistatic SAR system are large and the satellite covering time is short, the method comprises the following steps of: firstly reasonably approximating the range history, and deducting Doppler parameters suitable for an SA-BiSAR system starting from the Doppler definition based on the approximated range history; and decomposing the two-dimensional compression into a cascade form of two one-dimensional compressions and removing corresponding coupling terms based on the imaging thought of an RD (Range Doppler) algorithm, and finishing the focusing processing of the echoed data; and finally, putting forward a geometry correction method to correct in terms of the distortion phenomena in the focused image, thereby finishing fast imaging of the original scene. The method is characterized by fast and efficiently finishing the imaging of SA-BiSAR.

Description

Technical field: [0001] The invention belongs to the technical field of radar, and particularly relates to the imaging technology of a star-machine joint bistatic synthetic aperture radar (abbreviation: SA-BiSAR). Background technique: [0002] The star-plane combined bistatic SAR (SA-BiSAR for short) system adopts the working mode of satellite transmitting signal and aircraft receiving target echo signal to realize the imaging of the target area. The transceiver platform of the system has a large height difference and speed difference, which is a typical shift mode. SA-BiSAR adopts the working mode of transmitting signals from the spaceborne platform and receiving target echo signals from the airborne platform to realize the imaging of the target area. advantages, and its unique use of satellites to transmit signals makes the system have the advantages of wide coverage and low data acquisition costs; , to build different working modes (parallel flight or oblique flight mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 张晓玲左子谨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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