Establishment method of millimeter-wave radiation characteristic model of invisible plane

Abstract

The invention discloses an establishment method of a millimeter-wave radiation characteristic model of an invisible plane and relates to the field of passive detection of invisible planes. According to the method, a radiation brightness temperature transmission model of the invisible plane is established, and an expression of object radiation temperature with transmittance being 0 is derived according to a blackbody radiation theory; actual physical temperature of a body and a wake flame of the invisible plane is substituted into the derived expression, and a radiation temperature expression of the body and the wake flame of the invisible plane not considering attenuation is obtained; considering the attenuation of a path 1, an expression of air apparent temperature of the body and the wake flame of the invisible plane is obtained; and considering the attenuation of a path 2, radiation brightness temperature received by a radiometer antenna aperture surface is obtained. According to the method, the contribution of the wake flame and surface radiation temperature, after reflection of the body and the wake flame of the invisible plane, to the radiation brightness temperature of the invisible plane is considered, and therefore a calculation result is more accurate.

Description

technical field [0001] The invention relates to the field of passive detection of stealth targets, in particular to a method for establishing a millimeter wave radiation characteristic model of a stealth aircraft. Background technique [0002] In the battlefield, stealth aircraft has strong penetration capability and high threat, which is the top priority in the field of radar and infrared detection. The main stealth technology of stealth aircraft is radar stealth technology. Radar stealth technology generally obtains low detectability by reducing the radar cross section (RCS) of the target. Therefore, the main feature of stealth aircraft is that it is difficult to be detected by radar. The millimeter wave passive detection technology uses the inherent thermal radiation signal of the target itself to detect the target. In the cold sky background, stealth aircraft become high-temperature targets due to their own thermal radiation and reflection of ground radiation, and are e...

AI Technical Summary

Problems solved by technology

[0004] At present, the research on using millimeter-wave radiometers to detect long-distance stealth aircraft is still immature. Ni Wei established a microwave radiation brightness temperature transmission model in his paper "Research on Radiation Characteristics and Detection Methods of Air Targets", but did not consider the tail flame and The contribution of the surface radiation temperature to the radiation brightness temperature of the stealth aircraft after being reflected by the body of the stealth aircraft and the tail flame leads to inaccurate results, and does not give a quantitative difference in the brightness temperature difference between whether there is a target in the target airspace

Images