A Clutter Suppressed 3D Imaging Method Based on Real Aperture Doppler Beam Sharpening

Abstract

The invention discloses a clutter suppression three-dimensional imaging method based on real-aperture Doppler beam sharpening. The method comprises the following steps of a seeker sequentially transmitting a plurality of linear frequency modulation pulses and receiving a target echo; performing matched filtering on each pulse to obtain a one-dimensional distance image of a target; obtaining a distance Doppler image of the target by using a plurality of one-dimensional distance images for coherent processing; placing different scattering points of the target in different distance Doppler unitsthrough constant false alarm detection; obtaining azimuth angle and pitch angle information of different scattering points of the target by utilizing phased array breath ratio monopulse angle measurement; utilizing a multipath clutter suppression algorithm to suppress multipath clutters; and obtaining a three-dimensional image in the target coordinate system by using coordinate system Euler conversion. Compared with a two-dimensional image, the method can obtain the height information of a target. Multipath clutters are suppressed by using a multipath clutter suppression algorithm, and an accurate three-dimensional image of the hitting target is obtained. According to the method, an image basis is provided for subsequent accurate striking under the condition that the structural characteristics of the striking target are accurately obtained.

Description

technical field [0001] The invention relates to the field of missile-borne pulse Doppler radar, in particular to a three-dimensional imaging method for clutter suppression based on real-aperture Doppler beam sharpening. Background technique [0002] With the increasingly complex modern combat environment, multi-mission missiles have become the main development direction of air-launched missiles in the future. Air-launched missiles have the ability to strike multiple strikes against ground military bases while effectively striking airborne mobile targets. However, air-launched missiles are limited by the power of the warhead, and cannot achieve maximum strike effectiveness when attacking ground military bases. The three-dimensional imaging of the ground military base at the end of the guidance can obtain the structural characteristics of the base, and combining the structural characteristics to strike vulnerable parts can effectively improve the strike effectiveness. At the...

AI Technical Summary

Problems solved by technology

This method can solve the problem of antenna pattern mismatch, but it does not have the ability of frequency resolution. At the same time, it cannot complete the three-dimensional imaging of the target and the suppression of multipath clutter, and cannot accurately obtain the structural characteristics of the target.

[0007] None of the above methods in the prior art can realize the three-dimensional imaging of the target, obtain the accurate characteristic structure of the target, and provide the basis for subsequent precise strikes. At the same time, they cannot complete the suppression of multipath clutter, which affects the detection performance of the radar, resulting in the target image distortion of

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