Microwave staring imaging method

Abstract

The embodiment of the invention provides a microwave staring imaging method based on a time and space two-dimensional random radiation field and associative processing, which comprises the following steps that an antenna aperture field is specially required to randomly radiate a target area covered by a wave beam, and forming the noncorrelation characteristic that the radiation field with the time and space two-dimensional random distribution characteristics is required to simultaneously meet the time dimension and the space dimension; and after the radiation field is interacted with a detected target, a receiver is used for receiving an echo scattering field signal and extracting the target space information distribution of an area to be detected through receiving the correlated imaging process of a scattering filed and a known radiation field to realize the microwave staring imaging. With the adoption of the technical scheme provided by the invention, the defect that the traditional real aperture radar spatial resolution depends on the antenna aperture is overcome through the correlated microwave staring imaging of the time and space two-dimensional radiation field, and the high-resolution microwave staring imaging can be realized.

Description

technical field [0001] The invention relates to imaging technology in the fields of radar, microwave remote sensing and precise guidance, in particular, the invention relates to a microwave staring imaging method. Background technique [0002] Traditional real-aperture imaging radars include beam scanning radars, phased array radars, and focal plane imaging radars. For beam scanning radar, due to the limitation of beam coverage, it is necessary to use mechanical scanning to change the beam direction. like figure 1 Shown is a schematic diagram of a conventional antenna beam direction. Phased array radar replaces mechanical scanning with computer-controlled beam formation and scanning. It controls the phase and amplitude of each unit of the array antenna to form a beam that satisfies certain distribution characteristics in space, and can change its scanning direction, overcoming mechanical scanning. bring about problems. Focal plane imaging radar uses the deflection of the...

AI Technical Summary

Problems solved by technology

The transmitted signals of real aperture and focal plane imaging radars are all periodic signals in a fixed form, and the wavefront distribution of the radiation field formed at different times is basically the same. When the radiation field interacts with the target, the scattering field fuses the target information in one beam into At the same time, although the target information is implicit in the reply signal, it cannot be extracted, that is, the scattering field information contained in each received echo is the same, and multiple accumulations can only improve the signal-to-noise ratio, but cannot bring the information that can be used for target resolution. This is the root cause of traditional real aperture and focal plane radar imaging resolution depending on the antenna aperture

[0004] Therefore, it is necessary to propose an effective technical solution to solve the problem of low radar imaging resolution in the prior art

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