JPS641991A - Active sonar apparatus - Google Patents
Active sonar apparatusInfo
- Publication number
- JPS641991A JPS641991A JP15689687A JP15689687A JPS641991A JP S641991 A JPS641991 A JP S641991A JP 15689687 A JP15689687 A JP 15689687A JP 15689687 A JP15689687 A JP 15689687A JP S641991 A JPS641991 A JP S641991A
- Authority
- JP
- Japan
- Prior art keywords
- detection
- circuit
- detected
- signal
- outputs
- 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.)
- Granted
Links
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE: To completely eliminate error detection due to a noise input, by conducting sequential detection wherein only echoes are detected sequentially at every Δt on the occasion of reception processing.
CONSTITUTION: An inputted reception signal 401 is separated into frequency bands of fD1WfD7 by frequency analyzer circuit 501W507 and detected by amplitude detector circuits 511W517. Amplitude output detector circuits 551W557 determines whether amplitude detection outputs 541W547 reach a detection level, and inputs detected echoes 561...567 to a sequential detector circuit 570. Only when the detected echoes are outputted in the sequence of 561, 563,...567 in the detection sequence of 1W7, the circuit 570 outputs a sequential detection signal 571 to a target detector circuit 530. The circuit 530 outputs an echo detection signal 531 only when the signal 571 is inputted thereto and when a delay addition output 521 exceeds the detection level. By this constitution, error detection due to a noise input is eliminated completely.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-156896A JPH011991A (en) | 1987-06-23 | active sonar device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-156896A JPH011991A (en) | 1987-06-23 | active sonar device |
Publications (3)
Publication Number | Publication Date |
---|---|
JPS641991A true JPS641991A (en) | 1989-01-06 |
JPH011991A JPH011991A (en) | 1989-01-06 |
JPH0583154B2 JPH0583154B2 (en) | 1993-11-24 |
Family
ID=
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014032080A (en) * | 2012-08-02 | 2014-02-20 | Nec Corp | Active sonar apparatus, active sonar signal processing method, and signal processing program thereof |
CN108089169A (en) * | 2017-12-06 | 2018-05-29 | 上海无线电设备研究所 | A kind of Sequential Detection towards multiple target scene detection |
US11821483B2 (en) * | 2018-03-27 | 2023-11-21 | Hitachi Astemo, Ltd. | Electric motor control device and brake device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014032080A (en) * | 2012-08-02 | 2014-02-20 | Nec Corp | Active sonar apparatus, active sonar signal processing method, and signal processing program thereof |
CN108089169A (en) * | 2017-12-06 | 2018-05-29 | 上海无线电设备研究所 | A kind of Sequential Detection towards multiple target scene detection |
US11821483B2 (en) * | 2018-03-27 | 2023-11-21 | Hitachi Astemo, Ltd. | Electric motor control device and brake device |
Also Published As
Publication number | Publication date |
---|---|
JPH0583154B2 (en) | 1993-11-24 |
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