GB1394985A - Control arrangements for own doppler nullification in sonar systems - Google Patents
Control arrangements for own doppler nullification in sonar systemsInfo
- Publication number
- GB1394985A GB1394985A GB2675467A GB2675467A GB1394985A GB 1394985 A GB1394985 A GB 1394985A GB 2675467 A GB2675467 A GB 2675467A GB 2675467 A GB2675467 A GB 2675467A GB 1394985 A GB1394985 A GB 1394985A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ship
- cos
- signal
- resolvers
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/50—Systems of measurement, based on relative movement of the target
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/56—Display arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
1394985 Sonar systems PLESSEY CO Ltd 22 Aug [1968 [9 June 1967] 26754/67 Heading H4D A conventional sonar system (Fig. 1, not shown) carried by a ship 6, Fig. 2, and generating a signal having a frequency dependent upon the relative velocity of a target 7 with respect to the ship includes a control arrangement for nullifying the Doppler effect due to the ship motion, this arrangement generating a control voltage proportional to the quantity V T COS# T +V R COS# R where V represents the ship velocity, # represents the angle between the direction of ship travel and the line of sight with the target and T and R represent the values of V and # at the instants of transmission and reception, respectively, of the acoustic signal. The control voltage is used to modify the frequency-dependent signal to produce a resultant signal having a frequency dependent upon the absolute velocity of the target. As shown in Fig. 3, the receiver mixer 8 receives a sonar signal from a submerged transducer and also a signal from a second mixer 9, the mixer 9 having a fixed frequency input and also a correcting frequency input derived from own Doppler nullifier computer 11. The computer 11, Fig. 4, for deriving VTCOS# T + V R COS# R , comprises a V T V R servo 12 generating an A.C. voltage proportional to the ship's speed, this voltage being fed to the stator windings of three synchro resolvers 13, 14, 15. The three resolvers correspond with three channels related to three 30 degree sectors covered by the sonar, i.e., a centre sector and left and right hand sectors adjacent the centre sector. The rotors of the resolvers 13, 14, 15 are ganged together and rotated by a # T # R servo 16 through the angle #, the power being derived from the ship's gyro compass. The A.C. outputs from the resolvers are proportional to Vcos# and are fed to phase conscious rectifiers 17, 18, 19 which generate D.C. outputs having levels proportional to Vcos#. The outputs from rectifiers 17, 18, 19 are fed via T/R switches 20, 21, 22 to a respective memory device 23, 24 or 25 during transmission or a respective amplifier 26, 27 or 28 during reception, the outputs from 23... 28 being continuously added in devices 29, 30, 31. Thus the quantity V T COS# T +V R COS# R is derived separately for each channel and is fed to the voltage controlled oscillator 10 related to that channel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2675467A GB1394985A (en) | 1967-06-09 | 1967-06-09 | Control arrangements for own doppler nullification in sonar systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2675467A GB1394985A (en) | 1967-06-09 | 1967-06-09 | Control arrangements for own doppler nullification in sonar systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1394985A true GB1394985A (en) | 1975-05-21 |
Family
ID=10248691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2675467A Expired GB1394985A (en) | 1967-06-09 | 1967-06-09 | Control arrangements for own doppler nullification in sonar systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1394985A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4316269A (en) * | 1978-09-08 | 1982-02-16 | Westinghouse Canada Limited | Own doppler nullifier for sonar system |
FR2525774A1 (en) * | 1982-04-23 | 1983-10-28 | Thomson Csf | DEVICE FOR ADAPTIVE FILTERING OF SIGNALS RECEIVED BY ACTIVE SONAR FOR THE REJECTION OF REVERBERATION |
-
1967
- 1967-06-09 GB GB2675467A patent/GB1394985A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4316269A (en) * | 1978-09-08 | 1982-02-16 | Westinghouse Canada Limited | Own doppler nullifier for sonar system |
FR2525774A1 (en) * | 1982-04-23 | 1983-10-28 | Thomson Csf | DEVICE FOR ADAPTIVE FILTERING OF SIGNALS RECEIVED BY ACTIVE SONAR FOR THE REJECTION OF REVERBERATION |
EP0093057A1 (en) * | 1982-04-23 | 1983-11-02 | Thomson-Csf | Adaptive filtering apparatus for rejecting reverberation in an active sonar |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |