GB1415839A - Methods of determining the speed and distance travelled of a boad through water and to apparatus for carrying out the method - Google Patents

Methods of determining the speed and distance travelled of a boad through water and to apparatus for carrying out the method

Info

Publication number
GB1415839A
GB1415839A GB5333371A GB5333371A GB1415839A GB 1415839 A GB1415839 A GB 1415839A GB 5333371 A GB5333371 A GB 5333371A GB 5333371 A GB5333371 A GB 5333371A GB 1415839 A GB1415839 A GB 1415839A
Authority
GB
United Kingdom
Prior art keywords
frequency
speed
doppler
divider
give
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
Application number
GB5333371A
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.)
Detectronic Ltd
Original Assignee
Detectronic Ltd
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 Detectronic Ltd filed Critical Detectronic Ltd
Priority to GB5333371A priority Critical patent/GB1415839A/en
Publication of GB1415839A publication Critical patent/GB1415839A/en
Expired legal-status Critical Current

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
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S15/60—Velocity or trajectory determination systems; Sense-of-movement determination systems wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
    • G01P5/241—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by using reflection of acoustical waves, i.e. Doppler-effect
    • G01P5/242—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by using reflection of acoustical waves, i.e. Doppler-effect involving continuous, e.g. modulated or unmodulated, waves

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1415839 Acoustic Doppler systems DETECTRONIC Ltd 14 Nov 1972 53333/71 Heading H4D The speed of a boat relative to water is measured by a CW acoustic Doppler system in which the extracted Doppler difference frequency is divided to give a first quotient frequency which is a predetermined function of the Doppler difference frequency per unit increment of boat speed, and the first quotient frequency is further divided by a constant divisor to give a signal for actuating a speed indicator. In the embodiment described the extracted Doppler frequency signal is converted to a train of pulses at the Doppler frequency and these are fed to a first frequency divider which is adjustable to give a predetermined output frequency change per unit speed change. This allows any offset of the acoustic beam direction from the boat travel direction to be taken into account. The divider output is applied via a second frequency divider, having a selectable division ratio, to a frequency-to-current converter driving a deflection-type speed indicator, and is applied via a fixed division ratio part of the second divider to a counter which logs distance travelled. The selectable ratio determines the range of speed indicated.
GB5333371A 1971-11-17 1971-11-17 Methods of determining the speed and distance travelled of a boad through water and to apparatus for carrying out the method Expired GB1415839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5333371A GB1415839A (en) 1971-11-17 1971-11-17 Methods of determining the speed and distance travelled of a boad through water and to apparatus for carrying out the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5333371A GB1415839A (en) 1971-11-17 1971-11-17 Methods of determining the speed and distance travelled of a boad through water and to apparatus for carrying out the method

Publications (1)

Publication Number Publication Date
GB1415839A true GB1415839A (en) 1975-11-26

Family

ID=10467416

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5333371A Expired GB1415839A (en) 1971-11-17 1971-11-17 Methods of determining the speed and distance travelled of a boad through water and to apparatus for carrying out the method

Country Status (1)

Country Link
GB (1) GB1415839A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016716A1 (en) * 1979-03-15 1980-10-01 René Buttin Log-drift meter
US5777892A (en) * 1992-03-30 1998-07-07 Isco, Inc. Doppler shift velocity measuring system with correction factors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016716A1 (en) * 1979-03-15 1980-10-01 René Buttin Log-drift meter
FR2451590A1 (en) * 1979-03-15 1980-10-10 Buttin Rene LOCH-DERIVOMETER-ECHO SOUNDER COMBINATION
US5777892A (en) * 1992-03-30 1998-07-07 Isco, Inc. Doppler shift velocity measuring system with correction factors

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee