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Method and device for measuring near-surface BRDF (Bidirectional Reflectance Distribution Function) observation angles

An observation angle and near-ground technology, which is applied in the direction of measuring devices, measuring angles, surveying and navigation, etc., can solve the problems of large size, limited application range of measuring equipment, inconvenient operation, etc., and achieve small size, light weight, and high measurement range. big effect

Inactive Publication Date: 2012-08-08
REMOTE SENSING APPLIED INST CHINESE ACAD OF SCI
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Problems solved by technology

[0010] (2) The existing angle measurement equipment has a large volume because it is equipped with a mechanical mechanism, and must be fixed on a horizontal surface, which is inconvenient to operate. In addition, the cooperation with the BRDF optical detector limits the application range of the measurement equipment. , such as bodies of water or measurements of tall vegetation

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  • Method and device for measuring near-surface BRDF (Bidirectional Reflectance Distribution Function) observation angles
  • Method and device for measuring near-surface BRDF (Bidirectional Reflectance Distribution Function) observation angles
  • Method and device for measuring near-surface BRDF (Bidirectional Reflectance Distribution Function) observation angles

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[0046] In order to further explain the technical means and functions adopted by the present invention to achieve the intended invention purpose, the structure, features and functions of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0047] Such as image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 Shown is one of the designed embodiments of the present invention, and the system structure diagram is as follows image 3 As shown, the MEMS accelerometer is used as the sensitive element to measure the zenith angle, and the magnetoresistive sensor is used to measure the direction angle through the principle of measuring the earth's magnetic field. When the detector is in a certain position, the two sets of sensors respectively measure the geomagnetic component and the gravitational acceleration component of the detector in the three-axis direction, and the output of the sensor...

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Abstract

The invention discloses a method and device for measuring near-surface BRDF (Bidirectional Reflectance Distribution Function) observation angles. The method comprises the following steps of: measuring a zenith angle by using an MEMS (Micro Electro Mechanical System) gravity accelerometer; measuring an azimuth angle through measuring a geomagnetic field by two magnetoresistive sensors; when a BRDF optical detector is positioned at one observation position, respectively measuring a gravity acceleration component and a geomagnetic component of the BRDF optical detector in a three-axis direction by using two groups of sensors; and calculating obtained data by using a central processor so as to obtain two observation angles in a BRDF model; reflectivity and observation angles can be simultaneously measured by mounting the system and the BRDF optical detector on the same carrier platform.

Description

technical field [0001] The invention relates to a method for measuring near-surface BRDF observation angles, in particular to a method for assisting a BRDF optical detector in detecting zenith angles and azimuth angles during BRDF observations, and also relates to a device applied to the method. Background technique [0002] The reflection and scattering of solar short-wave radiation by objects on the earth's surface is non-Lambertian and has obvious directionality. The BRDF can be obtained by measuring the reflectivity of the earth's surface from different directions. The BRDF model is the theoretical basis for quantitative interpretation of multi-angle remote sensing. [0003] BRDF represents the reflection characteristics of the object surface at any observation angle under different incident angle conditions, and is a deterministic function describing the light reflection characteristics of the target surface. Let the wavelength be λ, the incident radiation with δ distr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C1/00
Inventor 顾行发陈继平余涛侯丽颖李家国郭红
Owner REMOTE SENSING APPLIED INST CHINESE ACAD OF SCI