Method for low-altitude obstacle super-resolution one-dimensional imaging of stepping frequency radar

Abstract

The invention discloses a method for low-altitude obstacle super-resolution one-dimensional imaging of a stepping frequency radar and relates to a stepping frequency radar super-resolution imaging method. The method comprises a first step of obtaining a receiving data vector of a distance scene through the stepping frequency radar; a second step of denoising the receiving data vector to obtain an observation vector; a third step of dividing a distance scene grille to obtain a grille distance; a fourth step of forming a dictionary matrix according to the observation vector and the grille distance; a fifth step of utilizing changes of the sparse recovery error ratio and using a null space adjustment method to obtain distance recovery vectors according to the dictionary matrix and the observation vector, and obtaining a one-dimensional image according to the distance recovery vectors at every moment. The problem that conventional compressed sensing is sensitive to noises, the number of scattering points is known and redundancy occurs after IFFT in traditional methods is solved mainly, and the method can be used for stepping frequency radar low-altitude obstacle detection and location and is the premise for achieving automatic hedging of a low-altitude aircraft.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and relates to a step-frequency radar super-resolution imaging method, in particular to a step-frequency radar super-resolution one-dimensional imaging method for low-altitude obstacles. Background technique [0002] Compared with other sensors, such as laser and optical radar, microwave radar has the advantages of all-weather and all-weather, and is one of the important means of low-altitude environment perception. In the case of limited antenna aperture for low-altitude aircraft, millimeter-wave radar can obtain narrow beams to improve spatial resolution due to its short wavelength, and at the same time, the small size of the antenna unit can reduce volume and weight, so it is one of the important sensors for low-altitude obstacle detection. . The step-frequency radar repeatedly transmits a series of radar pulses with linear hopping of the carrier frequency (this series of pulses is call...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose a super-resolution one-dimensional imaging method for low-altitude obstacles with stepped frequency radar, which solves the problem of conventional compressed sensing being sensitive to noise and the number of known scattering points in the prior art. And after IFFT, there is a redundancy problem, which enhances the robustness to noise, and at the same time obtains super-resolution capabilities

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