Double-base foresight synthetic aperture radar moving-target speed error function construction method

Abstract

The invention discloses a double-base foresight synthetic aperture radar moving-target speed error function construction method. According to the method, first, the Doppler barycenter and the Doppler adjustable frequency of a moving target are deduced in a double-base foresight SAR mode, and the orientation signals of the moving target are constructed; then the reference functions with speed estimation errors and the bearing signals of the moving target are used for correlation integral processing; finally, the largest value of the correlation integral results under different moving target speed estimation errors are respectively extracted to construct the speed error function. The speed error function can be used for comprehensively conducting quantitative analysis and research on the influence of movement of the moving target on imaging, and also can be used for completing double-base SAR moving target moving compensation, determining orientation self-focusing optimized long selection and the like, so that the focusing imaging of the double-base foresight SAR moving target can be realized in an efficient and high-precision mode.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to the moving target imaging of the bistatic forward-looking SAR in the 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. In the fields of terrain mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, and resource exploration, SAR has played an increasingly important role. However, due to the limitation of its own working system, the existing single-base SAR cannot realize high-resolution imaging of the forward-looking area of ​​the aircraft, so that the SAR technology cannot fully play its role in the forward-looking aircraft to the ground, ...

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Problems solved by technology

[0006] In the literature: "Synthetic aperture imaging radar and moving targets", R.K.Raney, IEEE Trans. on Aerospace and Electronic Systems, vol.7, no.3, pp.499–505, 1971, in the literature: "Autofocusing of inverse synthetic aperture radar images using contrast optimization", F.Berizzi and G.Corsini, IEEE Trans.on Aerospace and Electronic Systems, vol.32, no.3, pp.1185–1191, 1996, and literature: "Moving target relative speed estimation and refocusing in synthetic aperture radar images", T.K.Sjogren, V.T.Vu, M.I.Pettersson, A.Gustavsson, and L.M.H.Ulander, IEEE Trans. on Geoscience and Remote Sensing, vol.48, no.10, pp.3799-3815, 2010, Both focus on the most commonly used and most effective self-focusing algorithm for moving target imaging, but in the case of unknown moving target speed, the self-focusing algorithm involves the problem of optimal step selection, and the impact of moving target motion in bistatic forward-looking SAR. Issues such as the impact of imaging have not yet been studied in the relevant public literature

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