High resolution dbs imaging method for airborne radar based on spice

Abstract

The invention discloses a SPICE-based airborne radar high-resolution DBS imaging method. The method comprises the steps of (1) enabling the pulse compression treatment on echo signals received by an airborne radar in the range dimension to obtain the echo signals of all range gates after the pulse compression treatment, and establishing a signal model of an echo signal xi of the i range gate; (2) figuring out a covariance matrix Ri of the echo signal yi of the i range gate after the pulse compression treatment; (3) figuring out an optimized model for the power value of the terrain clutter echo signal xi of the i range gate; (4) successively arranging front N power values of the terrain clutter echo signal xi of the i range gate to form a power vector of the terrain clutter echo signal xi of the i range gate, so as to further obtain the power matrix of all the range gates, namely the final echo data matrix of the airborne radar; (6) converting the final echo data matrix of the airborne radar into a geodetic coordinate system to obtain a final DBS image.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a high-resolution DBS imaging method for airborne radar based on Sparseiterative covariance-based estimation (SPICE), which can be used when the number of pulses transmitted by airborne radar is small , to obtain a higher image resolution. Background technique [0002] Doppler beam sharpening (DBS) imaging is a non-focused imaging technique that scans the radar beam in a large area, and generally images the observation area under the condition of frontal side view. Although DBS imaging technology does not have high lateral resolution like synthetic aperture radar imaging technology, the computational complexity of DBS imaging is low, and its lateral resolution ability has been substantially improved compared with real beams, which can be used in relatively Complete imaging of a wide range of scenes in a short period of time. [0003] The traditional DBS imaging technology based ...

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Problems solved by technology

Moreover, the traditional DBS imaging technology based on Fourier transform often leads to the leakage of signal energy, which reduces the definition of DBS images and overestimates the signal energy power.

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