JPS641991A - Active sonar apparatus - Google Patents

Active sonar apparatus

Info

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
Application number
JP15689687A
Other languages
Japanese (ja)
Other versions
JPH011991A (en
JPH0583154B2 (en
Inventor
Hiroyuki Morioka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP15689687A priority Critical patent/JPS641991A/en
Publication of JPH011991A publication Critical patent/JPH011991A/en
Publication of JPS641991A publication Critical patent/JPS641991A/en
Publication of JPH0583154B2 publication Critical patent/JPH0583154B2/ja
Granted legal-status Critical Current

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
JP15689687A 1987-06-23 1987-06-23 Active sonar apparatus Granted JPS641991A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15689687A JPS641991A (en) 1987-06-23 1987-06-23 Active sonar apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15689687A JPS641991A (en) 1987-06-23 1987-06-23 Active sonar apparatus

Publications (3)

Publication Number Publication Date
JPH011991A JPH011991A (en) 1989-01-06
JPS641991A true JPS641991A (en) 1989-01-06
JPH0583154B2 JPH0583154B2 (en) 1993-11-24

Family

ID=15637761

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15689687A Granted JPS641991A (en) 1987-06-23 1987-06-23 Active sonar apparatus

Country Status (1)

Country Link
JP (1) JPS641991A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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