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Method for optimizing and estimating L-waveband forest microwave radiation transmission characteristics

A technology of microwave radiation and transmission characteristics, applied in the field of forest parameter estimation, can solve the problem of lack of accurate and effective L-band forest microwave radiation transmission

Active Publication Date: 2017-12-08
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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AI Technical Summary

Problems solved by technology

With the rapid development of spaceborne microwave radiation technology, people's desire to study the transmission characteristics of L-band forest microwave radiation is increasing, but in the prior art, there is no accurate and effective optimal estimation method for L-band forest microwave radiation transmission characteristics

Method used

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  • Method for optimizing and estimating L-waveband forest microwave radiation transmission characteristics
  • Method for optimizing and estimating L-waveband forest microwave radiation transmission characteristics
  • Method for optimizing and estimating L-waveband forest microwave radiation transmission characteristics

Examples

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Embodiment 1

[0054] The optimal estimation method for microwave radiation transmission characteristics of L-band forests is carried out for coniferous forests. The forest parameters are shown in Table 1:

[0055] Step 1, a) Use the L-band microwave radiometer to measure the multi-angle forest downlink microwave radiation brightness temperature TB MEA and the sky downlink microwave radiance temperature T SKY ; b) Simultaneously measure the forest temperature T by the thermal infrared instrument V and soil temperature T S ; c) Measure surface roughness parameters (surface root mean square height and surface correlation length) using roughness plate; d) Measure soil moisture using ring knife sampling method; e) According to parameters such as soil moisture and soil roughness, use AIEM The model simulates the surface emissivity eS;

[0056] Step 2. The simulated L-band forest downlink microwave radiance temperature TB SIM :

[0057] TB SIM =[t×(T SKY -T V )+T V ×(1-r V )+r V × e S ...

Embodiment 2

[0065] For the coniferous forest in Example 1, a spatial location different from that in Example 1 is selected for estimation, and other processes are the same as in Example 1. Optimal estimation of forest effective transmittance t and forest effective scattering albedo ω, the results are as follows figure 2 (b) and 4(b).

[0066] For confirming the correctness and effectiveness of the optimal estimation method of the L-band forest microwave radiation transmission characteristic of the present invention, the forest microwave radiation transmission model simulation of the physical process is carried out to the forest microwave radiation transmission characteristic parameter (t and ω) of embodiment 2, the result also respectively as figure 2 (b) and 4(b).

Embodiment 3

[0068] The optimal estimation method of the microwave radiation transmission characteristics of the L-band forest is carried out for broad-leaved forests. The forest parameters are shown in Table 1. The steps of the optimal estimation method are the same as in Example 1, and the optimized estimation of the forest effective transmittance t and the forest effective scattering albedo ω, the result is as image 3 (a) and Figure 5 (a) shown.

[0069] For confirming the correctness and effectiveness of the optimal estimation method of the L-band forest microwave radiation transmission characteristics of the present invention, the forest microwave radiation transmission model simulation of the physical process is carried out to the forest of embodiment 3, through simulation, the forest effective transmittance t and Forest effective scattering albedo ω is also as follows image 3 (a) and Figure 5 (a) shown.

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Abstract

The invention discloses an optimizing estimation method of L-waveband forest microwave radiation transmission characteristics and belongs to the technical field of forest parameter estimation. The problem how to provide a method for effectively and accurately optimizing and estimating forest microwave radiation transmission characteristics. The method comprises the steps that firstly, the quantitative relation between forest downstream microwave radiation brightness temperature and forest microwave radiation transmission characteristics (effective transmittance rate and effective scattering refection rate omega) according to a microwave radiation transmission theory is modeled, then a cost function is established based on actually measured forest downstream microwave radiation brightness temperature and simulated forest downstream microwave radiation brightness temperature, and finally the effective transmittance rate and effective scattering refection rate of forest are optimized and solved according to a genetic algorithm. It is detected through an experiment that the effective transmittance rate and effective scattering refection rate, estimated by utilizing the method, of forest are very consistent with simulation values of a theoretical model, which indicates that the method is effective for optimizing and solving the L-waveband forest microwave radiation transmission characteristics.

Description

technical field [0001] The invention relates to an optimal estimation method for transmission characteristics of L-band forest microwave radiation, and belongs to the technical field of forest parameter estimation. Background technique [0002] As one of the main cover types of the earth's surface, forest is the main body of terrestrial ecosystem, and plays an irreplaceable role in water cycle, carbon cycle, energy cycle and maintaining ecological balance. Therefore, the quantitative observation and inversion of forest biophysical parameters, soil under forest cover, snow cover and other parameters on the regional and global scales has become an important issue to solve the problems of global water cycle, global environmental change, carbon source and carbon. The key to environmental issues such as sinks. [0003] Remote sensing technology provides technical support for realizing large-area, real-time dynamic observation of forest parameters and surface parameters under for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01D1/02
CPCG01D1/02G06F30/20
Inventor 郑兴明姜涛李晓峰赵凯
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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