Method for three-dimensional imaging of precession cone

Abstract

The invention provides a method for three-dimensional imaging of a precession cone. The method comprises the following steps that pulses are transmitted and received by radar at the pulse repetition rate and an echo with the distance serving as a row vector and with the orientation serving as a column vector is obtained; Doppler central fuzzy compensation is conducted on the echo and an echo of a distance frequency domain-orientation slow time domain is obtained after compensation is conducted; translational motion correction is conducted on the echo through a time domain scale variation method; different curves are constructed, phase-coherent accumulation is conducted on the echo after translational motion is conducted, joint estimation is conducted on jogging parameters, three-dimensional coordinates are marked according to three-dimensional images of other scattering centers and a three-dimensional image of a conic vertex scattering center, three-dimensional imaging is conducted, and a three-dimensional image of a precession cone target is obtained. According to the method for three-dimensional imaging of the precession cone, the scattering center distribution feature of a precession cone optical zone is utilized, the real three-dimensional coordinates of the cone scattering center are estimated, accurate estimation of the jogging parameters such as a conic precession angle is achieved, and therefore the three-dimensional image with good focusing and high resolution of the complex precession cone target is obtained.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a high-resolution three-dimensional imaging method of a precession cone in the radar signal processing technology. Background technique [0002] Precession is a typical fretting form of space objects such as cones. If the three-dimensional distribution of the scattering center of the precession cone and the micro-motion parameters such as spin frequency, precession frequency, and precession angle can be accurately estimated through high-resolution radar imaging, the shape, structure, and motion information of this type of target can be obtained. It provides important support for subsequent target classification and identification. At present, high-resolution imaging and micro-motion parameter estimation of typical micro-moving targets are important research directions in the field of radar imaging and radar automatic target recognition. [0003] The Chinese invention ...

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Problems solved by technology

However, this method requires that the change in the rotational angular velocity of the target relative to the radar is less than 0.05rad / s, and the total rotational angle is less than 360°, while the precessing target rotates at a high speed during the observation time, the total rotational angle will exceed 360°, and the precessing cone target Scattering centers will have serious over-distance cell movement, which will invalidate the two-dimensional image calibration method based on fractional Fourier transform; when the target contains sliding scattering centers or there is occlusion, the scattering centers cannot be completely matched and the three-dimensional scattering centers will be relocated. struct method failure

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