Method for calculating radar scattering properties of stable section of aircraft wake flow in clear sky

Abstract

The invention provides a method for calculating the radar scattering properties of a stable section of aircraft wake flow in clear sky. According to the technical scheme, the method includes the steps of firstly, calculating dielectric constant distribution and internal electric field distribution of the aircraft wake flow, and then calculating the high vibration integration derived from a scattering integral equation to obtain the radar scattering cross section of the aircraft wake flow. Compared with a conventional method for calculating the electromagnetic scattering properties, the method has the advantages that the calculated amount and the storage amount are lowered in a magnitude mode, the relationship between the radar scattering cross section of the aircraft wake flow and the frequency of incident waves can be calculated and obtained through the method, and theory supports and model supports are provided for the development of the related radar detection technologies.

Description

technical field [0001] The invention belongs to the technical field of radar target characteristics, and relates to the calculation of radar scattering characteristics of aircraft wakes and other special super-large electrical size non-uniform medium targets, and can provide technical support for the research of aircraft wake scattering mechanism and the development of radar detection technology. Background technique [0002] Aircraft wake is a strong spiral airflow formed behind the aircraft during flight. It has the characteristics of large spatial scale, long duration, and strong rotation. It has a serious impact on the flight safety of subsequent aircraft (rolling, shaking, stalling, etc. Wait). In order to ensure flight safety, the International Civil Aviation Organization established a set of aircraft safety separation standards in the early 1970s. This standard does not distinguish between weather conditions and relies on parameters such as the size, speed, and weight...

AI Technical Summary

Problems solved by technology

The wake scattering characteristics of clear-air aircraft are generally studied as heterogeneous medium targets, but the electrical size of the aircraft wake is particularly large (up to hundreds of meters in the direction of wingspan and aircraft height, and even up to kilometers in the direction of aircraft flight) And the structure is complex, which makes the theoretical research on wake radar scattering characteristics slow down for a long time due to technical bottlenecks such as difficult modeling and huge amount of calculation.

It is precisely because of this that people's current understanding of the wake scattering characteristics is not deep enough, which makes the research on existing detection methods and detection experiments very blind, and many results of detection experiments cannot give reasonable explanations at the level of mechanism

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