探地雷达宽角反射图形拟合方法

doi:10.11720/wtyht.2021.2506

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Abstract

The Geological Radar Common Middle Point (CMP) method is only used for local velocity testing. For the purpose of using a wide-angle reflection method for profiling, one radar antenna can be fixed and another antenna moves along the line of measurement to obtain the reflection signal of the entire geological interface. In this paper, the method of wide angle reflection profile detection is proposed. The relations of reflection signals are derived based on the interface of straight rock formations, and the interpretation software is developed to accurately calculate the geometric parameters and layer velocity of rock formations, so as to carry out geological stratification.

Key words： GPR wide angle reflection graph fitting time-distance curve layer velocity

Received: 30 October 2019 Published: 01 March 2021

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	Articles by authors
	Lian-Chu CAI
	Nian-You MIAO

Cite this article:

Lian-Chu CAI,Nian-You MIAO. The graph fitting method of wide angle reflection of GPR[J]. Geophysical and Geochemical Exploration, 2021, 45(1): 239-244.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.2506 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I1/239

Schematic diagram of wide angle reflection

Typical wide angle reflection image

Three layer wide angle reflection interface model

Time-distance curve of forward modeling of three-layer model

Narrow angle reflection radar image and interpretation results

Wide angle reflection inversion

Comparison of wide angle reflection and narrow angle reflection results

Interval velocity calculation table

Results of wide angle reflection

J4 cophase axis reading table

i	x_i	τ_i	$x i 2$	$x i 3$	$x i 4$	x_iτ_i	$x i 2$ τ_i
1	-8	68 822	64	-512	4 096	-550 575	4 404 603
2	-6	63 274	36	-216	1 296	-379 642	2 277 849
3	-4	56 788	16	-64	256	-227 154	908 616
4	-2	52 052	4	-8	16	-104 104	208 208
5	0	48 592	0	0	0	0	0
6	2	44 815	4	8	16	89 631	179 262
7	4	43 626	16	64	256	174 505	698 019
8	6	42 931	36	216	1296	257 586	1 545 516
9	8	43 626	64	512	4096	349 010	2 792 078
10	10	44 490	100	1 000	10 000	444 895	4 448 955
$∑$	10	509 017	340	1 000	21 328	54 152	17 463 105

J4 Cophase axis reading calculation table

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