A Material Classification Method Based on Passive Millimeter Wave Polarization Imaging
A classification method, millimeter-wave technology, applied in radio wave reflection/re-radiation, radio wave measurement systems, instruments, etc., can solve the problems of easy annihilation of metal targets, difficult detection and identification, etc., and achieve low power consumption and good robustness sexual effect
Active Publication Date: 2018-07-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
However, just because the metal target mainly reflects the environment, when the brightness temperature of the environment reflected by the metal surface is high (for example, the atmospheric radiation brightness temperature at low elevation angle is relatively high, which is close to the radiation brightness temperature of the ground object), the metal target is easy to be buried in the ground object Medium, but difficult to detect and identify
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[0047] Example: Aluminum plate and non-metallic material classification experiment on soil and cement ground
[0048] In this example, if figure 1 As shown in (a), three 1m×1m square aluminum plates, one circular aluminum plate with a diameter of 0.7m, and one 0.4m×0.7m long direction wooden board are placed on the soil and cement floor. The imaging area of the millimeter wave radiometer is within the dotted line frame, and the imaging distance is 30m. figure 1 (b) is a 94GH radiometer imaging system, which has a reflecting surface with a diameter of 0.3m, an angular resolution of 0.8°, and an integration time of 5ms. Such as figure 2 As shown in , the scene is scanned and imaged at an incident angle of 68°, all substances on the ground reflect the atmosphere, and the millimeter-wave thermal radiation of the atmosphere is non-polarized, so the scene belongs to a non-polarized illumination environment. image 3 The relative placement of the tested material is given, Fig...
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The invention discloses a material classification method based on passive millimeter-wave polarization imaging; firstly, a millimeter-wave radiometer imaging system is used to obtain a horizontal polarization diagram and a vertical polarization diagram of a scene at a given incident angle in a non-polarized illumination environment; Then calculate the "linear polarization ratio" image according to the horizontal polarization diagram and vertical polarization diagram; then statistically analyze the distribution law of the "linear polarization ratio", and use the threshold estimation formula to estimate the threshold value of the "linear polarization ratio"; finally, according to the classification Criteria to realize the classification of metallic materials and non-metallic materials in the scene. The invention can effectively classify metal materials and dielectric materials in a non-contact and passive manner, and is not affected by environmental radiation changes, has good robustness, and can be used for remote sensing and detection of metal targets and the safety of metal dangerous goods Detection and early warning and other fields.
Description
technical field [0001] The invention belongs to the technical field of passive microwave remote sensing and detection, and more specifically relates to a material classification method based on passive millimeter wave polarization imaging. Background technique [0002] All natural and man-made substances will spontaneously radiate electromagnetic energy to space in the form of electromagnetic waves when the physical temperature is higher than absolute zero. The millimeter wave radiometer realizes remote sensing and detection of targets by receiving this electromagnetic signal. This technology is usually It is called passive millimeter wave radiation measurement technology. Millimeter wave radiation measurement has the advantages of all-day, quasi-all-weather work, concealment and to a certain extent penetrating clothing, so it has been applied to fields such as atmospheric remote sensing, ocean monitoring, soil and vegetation remote sensing, agricultural detection, security ...
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IPC IPC(8): G01S13/89G06K9/62
CPCG01S13/89G06F18/24
Inventor 胡飞程亚运桂良启贺锋郎量
Owner HUAZHONG UNIV OF SCI & TECH