JPS6449992A - Real-time removing device for multiple reflection in submarine investigation - Google Patents
Real-time removing device for multiple reflection in submarine investigationInfo
- Publication number
- JPS6449992A JPS6449992A JP20801787A JP20801787A JPS6449992A JP S6449992 A JPS6449992 A JP S6449992A JP 20801787 A JP20801787 A JP 20801787A JP 20801787 A JP20801787 A JP 20801787A JP S6449992 A JPS6449992 A JP S6449992A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- time
- ultrasonic wave
- corrected
- reflection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To remove multiple reflection by performing subtraction between ultrasonic wave echo signals and 1st and 2nd reflection loss corrected signal obtained by correcting the reflection loss of 1st and 2nd reflected signals among the ultrasonic wave echo signals. CONSTITUTION:The 1st and 2nd reflected signals S1 and S2 are recorded in a memory circuit 7 as digital data as to ultrasonic wave echo signals from a point of time which is a time t1 elapsed from a keying pulse Kp. The recording data are read out in order from a point of time which is a time 2t1 elapsed. Then the digital data is converted by a D/A converter 17 and corrected in consideration of reflection loss to obtain 1st and 2nd reflection loss corrected signals S1' and S2'. Then the corrected signals S1' and S2' and ultrasonic wave echo signals are processed by subtraction to cancel 2nd and 3rd reflected signals S2 and S3, thereby obtaining a multiple-reflection removed signal,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20801787A JPS6449992A (en) | 1987-08-20 | 1987-08-20 | Real-time removing device for multiple reflection in submarine investigation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20801787A JPS6449992A (en) | 1987-08-20 | 1987-08-20 | Real-time removing device for multiple reflection in submarine investigation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6449992A true JPS6449992A (en) | 1989-02-27 |
Family
ID=16549297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20801787A Pending JPS6449992A (en) | 1987-08-20 | 1987-08-20 | Real-time removing device for multiple reflection in submarine investigation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6449992A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008533535A (en) * | 2005-03-16 | 2008-08-21 | イエベネ・デ・マドリード、ゴンサロ | Forced flag waving system for advertising devices and the like, and corresponding operating method of this system |
-
1987
- 1987-08-20 JP JP20801787A patent/JPS6449992A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008533535A (en) * | 2005-03-16 | 2008-08-21 | イエベネ・デ・マドリード、ゴンサロ | Forced flag waving system for advertising devices and the like, and corresponding operating method of this system |
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