A Passive Millimeter-Wave Radiation Simulation Method Able to Discriminate Different Rough Surfaces

A simulation method, millimeter wave technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, radio wave measurement systems, etc., can solve problems such as inapplicability

Active Publication Date: 2020-09-29
ZHEJIANG JINMA AUTOMATION TECH CO LTD
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Problems solved by technology

The disadvantage of this method is that it is only suitable for deep rough surfaces, but for medium rough surfaces or micro-rough surfaces, this method cannot be applied, so that the rough surfaces of the same medium with different roughness cannot be distinguished

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  • A Passive Millimeter-Wave Radiation Simulation Method Able to Discriminate Different Rough Surfaces
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  • A Passive Millimeter-Wave Radiation Simulation Method Able to Discriminate Different Rough Surfaces

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with accompanying drawing.

[0051] like figure 1 As shown, step 1, establish a three-dimensional model of the scene to be tested. The 3D model includes the ground, radiometer mounting points, and multiple targets. Taking the image of an airport runway as an example, the invention is used to detect and distinguish the height of the grass. like figure 1 As shown, the picture is an actual optical photo of an airport runway. It can be seen from the photo that the grass next to the runway can be roughly divided into two types, a higher light-colored area and a shorter dark-colored area. For the airport runway, the established 3D model is as follows: figure 2 shown. In the 3D model, the runway, the warehouse in the distance, and the grass on both sides are distinguished. The physical temperature of the ground and all targets, the roughness of each side, the reflectivity and emissivity of each angle a...

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Abstract

The invention discloses a passive millimeter wave radiation simulation method capable of distinguishing different rough surfaces. An existing passive millimeter wave radiation simulation method is only suitable for deep rough surfaces, but cannot be suitable for medium rough surfaces or micro rough surfaces. The passive millimeter wave radiation simulation method capable of distinguishing different rough surfaces comprises the steps that 1, a three-dimensional model of a tested scene is established; 2, the three-dimensional model established in the step 1 is subdivided; 3, a ray groups are defined, one ray group includes b rays; 4, the brightness temperature reaching a radiometer along a*b rays is calculated, and the reflection of a second layer in the calculation is considered; and 5, theobtained a*b brightness temperatures reaching a radiometer antenna are converted into a brightness temperature imaging simulation map with a*b resolution. According to the passive millimeter wave radiation simulation method, a passive radiation model of the rough surfaces is further accurately characterized, so that the bright temperature imaging simulation map obtained by the passive millimeterwave radiation simulation method is closer to the actual detection situation. The passive millimeter wave radiation simulation method can be used for being compared with a bright temperature image shot by the radiometer, thereby judging the quality of the radiometer.

Description

technical field [0001] The invention belongs to the technical field of computer-aided analysis and design and software design, and in particular relates to a grassland height detection and resolution method for passive millimeter wave radiation simulation. Background technique [0002] Passive Millimeter Wave (PMMW) is an important link in the field of passive millimeter wave imaging. It can help to understand the radiation characteristics of the target, explain the radiation phenomenon, find the radiation law and judge the pros and cons of the actual measurement results. The advantages mentioned above have made millimeter wave imaging simulation more and more important in recent years. So far, most of the work has focused on the scene where the surface of the target to be tested is a smooth plane, but there is little mention of the scene where the surface of the target to be tested is rough. [0003] In the traditional ray tracing method, when the ray encounters a rough su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/88G01S13/89
Inventor 尹川张忠海潘玉剑耿友林
Owner ZHEJIANG JINMA AUTOMATION TECH CO LTD
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