Rapid simulation method for target near-field radar echoes

Abstract

The invention discloses a rapid simulation method for target near-field radar echoes. Rapid calculation of the near-field echoes in different states is achieved. A near-field scattering database can be rapidly obtained by utilizing a multilayer matrix decomposition or multilayer rapid multipole technology; a quick search tree is established, a database can be quickly retrieved, and near-field echoes of any field point in an observation area can be accurately obtained.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic calculation, and in particular relates to a fast simulation method of target near-field radar echo. Background technique [0002] The research on near-field electromagnetic scattering characteristics of targets is developed based on the background of radio fuze related technologies, and plays an important role in the fields of precision guidance and electromagnetic compatibility. In near-field conditions, the radar echo needs to consider the non-plane wave effect of the incident field, distance and local illumination. In addition, in related applications, there is still high-speed motion between the target and the antenna, and the influence of many factors increases the difficulty of near-field radar echo research. [0003] The prior art acquires target near-field radar echo mainly through actual measurement and numerical simulation. Among them, the actual measurement is to carry out exp...

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Problems solved by technology

[0005] 1. The actual measurement has high requirements on the site, many interference factors, and a long test cycle, which inevitably limits its practical application

[0006] 2. In the numerical method, the high-frequency approximate numerical method cannot accurately describe the fine structure of the target, and the calculation result of the complex target deviates from the actual measurement result

However, the traditional full-wave numerical method needs to integrate the surface equivalent electromagnetic current of the entire target to calculate the scattered echo of each field point, and the calculation of large radar near-field echo observation areas is very time-consuming.

[0007] 3. Radar echo data in different states obtained by each measurement or simulation is not reusable

[0008] In summary, the existing techniques for solving near-field scattered echoes generally have problems such as low efficiency, insufficient precision, and inflexibility. It is urgent to develop new technologies to solve the problem of fast and accurate calculation of near-field scattered echoes.

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