A linear signal transmission system calibration method of wideband GPR

被引：0

作者：

Wu, Bin ^{[1
,2
]}

Zhao, Kai ^{[1
]}

Gu, Ling-jia ^{[2
]}

Cao, Qiong ^{[2
]}

Li, Xiao-feng ^{[1
]}

Zheng, Xing-ming ^{[1
]}

机构：

[1] Chinese Acad Sci, Northeast Inst Geog & Agroecol, 4888 Shengbei St, Changchun 130102, Peoples R China

[2] Jilin Univ, Coll Elect Sci & Engn, 2699 Qianjin St, Changchun 130012, Peoples R China

来源：

EARTH OBSERVING SYSTEMS XXI | 2016年 / 9972卷

关键词：

Ground Penetrating Radar; Transmission Line Method; Least Square Method; Calibration; GROUND-PENETRATING RADAR; SAMPLING-CIRCUIT;

D O I：

10.1117/12.2237153

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In VHF pulse Ground Penetrating Radar(GPR) system, the echo pass through the antenna and transmission line circuit, then reach the GPR receiver. Thus the reflection coefficient at the receiver sampling gate interface, which is at the end of the transmission line, is different from the real reflection coefficient of the media at the antenna interface, which could cause the GPR receiving error. The pulse GPR receiver is a wideband system that can't be simply described as traditional narrowband transmission line model. Since the GPR transmission circuit is a linear system, the linear transformation method could be used to analyze the characteristic of the GPR receiving system. A GPR receiver calibration method based on transmission line theory is proposed in this paper, which analyzes the relationship between the reflection coefficients of theory calculation at antenna interface and the measuring data by network analyzer at the sampling gate interface. Then the least square method is introduced to calibrate the transfer function of the GPR receiver transmission circuit. This calibration method can be useful in media quantitative inversion by GPR. When the reflection coefficient at the sampling gate is obtained, the real reflection coefficient of the media at the antenna interface can be easily determined.

引用

页数：8

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