Squint spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method

A technology of synthetic aperture radar and squint star machine, applied in the field of radar

Inactive Publication Date: 2012-11-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency that the existing frequency domain imaging technology cannot be applied to squint SA-BSAR, and provide an imaging method suitable for squint SA-BSAR system, which fully considers the system characteristics of squint SA-BSAR , using the system echo two-dimensional spectral analysis formula, through two-dimensional non-uniform Fourier transform (Two-Dimensional NUFF T, abbreviated as 2D-NUFFT), to achieve high-precision frequency domain imaging

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  • Squint spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method

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Embodiment Construction

[0068] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on MATLAB7.11 (R2010b).

[0069] In this embodiment, the TerraSAR-X satellite and the airborne PAMIR are used as the transmitting and receiving platforms respectively. The two platforms fly in parallel and in the same direction. / s and 400m / s, the center frequency of the transmitted signal is 9.65GHz, the bandwidth of the transmitted signal is 100MHz, the pulse repetition frequency is 3800Hz, and the echo signal distance sampling frequency is 200MHz. Other system platform simulation parameters such as Figure 5 As shown, the simulated imaging scene contains 9 point targets, and their relative positions are as follows figure 2 shown, where the reference point target is P 0 in the center of the scene.

[0070] Step 1. Echo signal distance compression

[0071] Store the echo data s(τ,t) of the squint star bistatic SAR system in ...

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Abstract

The invention discloses a squint spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method. Based on characteristics of a squint SA-BSAR (spaceborne/airborne hybrid bistatic synthetic aperture radar) system, a wave number mapping relationship in a two-dimensional space can be obtained through an analytical expression of a two-dimensional spectrum of the system, and an imaging processing is efficiently achieved through two-dimensional non-uniform fast Fourier transformation. By the squint spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method, a decoupling problem of a two-dimensional spatial domain and a two-dimensional frequency domain is solved, and a small scene supposition is not required; therefore, the squint spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method is applicable to high-performance imaging of the SA-BSAR system with a relatively large squint angle and a relatively wide imaging scene range; the squint spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method has relatively high imaging performance and relatively high computing efficiency; and a blank that the existing SA-BSAR frequency domain imaging technology cannot be applied to high-resolution imaging of the squint SA-BSAR system is filled.

Description

technical field [0001] The invention belongs to the field of radar technology, and in particular relates to the high-efficiency imaging technology of star-machine bistatic synthetic aperture radar (abbreviation: SA-BSAR). Background technique [0002] The star-machine bistatic SAR (SA-BSAR for short) system adopts the working mode that the satellite-borne platform transmits signals and the airborne platform receives target echo signals to realize the imaging of the target area. SA-BSAR not only has good concealment, strong anti-jamming capability and battlefield survivability, but also has unique advantages due to its unique "far-sending and close-receiving" working mode: flexible system, rich target information acquisition, anti-jamming Strong capability, high spatial resolution and low system cost. Therefore, SA-BSAR has high research value. The German Aerospace Agency (FGAN) Institute of High Frequency Physics and Radar Technology (FHR) implemented the world's first SA-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 刘哲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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