Multi-offset diffraction superposing imaging method for processing two-layer medium

Abstract

The invention provides a multi-offset diffraction superposing imaging method for processing a two-layer medium, and the method comprises the steps: carrying out the discrete meshing of a detection region, and dividing the detection region into M*N grids, wherein each grid serves as a sub-wave source, and M and N are positive integers; detecting the energy, received by each receiving antenna, of an i-th sub-wave source from a standardized detector data set after preprocessing, and obtaining the corresponding energy of the i-th sub-wave source in the data of each frame, wherein i=1, 2, ...,M*N; carrying out the superposing of the energy of the i-th sub-wave source in the data of each frame according to the number of frames, and obtaining the total energy of the sub-wave sources; carrying out the traversing of the M*N sub-wave sources, and obtaining the geological conditions of the whole detection region for imaging. According to the invention, the method employs a diffraction superposing method in the offset imaging, so the method meets the imaging requirements of multi-offset MIMO radars at certain heights, is clear in imaging, and has advantages for the processing of heterogeneous and layered mediums.

Description

technical field [0001] The invention belongs to the field of surface and underground detection and imaging, and relates to an imaging method for multi-offset diffraction superposition for processing two-layer media. Background technique [0002] LRPR (Lunar Regolith Penetrating Radar) is a high-resolution lunar soil surface penetrating radar based on the non-carrier frequency picosecond pulse signal system of the Chang'e-5 lander platform. -5) One of the important payloads of mission scientific detection targets. The detection mission of the lunar soil structure detector is the detection of the lunar subsurface structure, which is mainly used in the following two aspects: detection of lunar soil thickness and structure; and providing information support for the drilling and sampling process. [0003] The lunar soil structure detector is installed on the floor of the lander at a height of about 90cm from the lunar surface. Since the lander system is stationary, the lunar soi...

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Problems solved by technology

[0008] However, the existing commercial ground penetrating radar usually works in mobile mode, and has only one transmitting antenna and one receiving antenna. At present, most of the imaging technologies are aimed at commercial ground penetrating radar, which is not suitable for the imaging of lunar soil structure detectors. , so it is necessary to study a new imaging algorithm to meet the imaging requirements of the array radar in a static state, with a certain height from the ground, multiple offsets, and multiple inputs and outputs.

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