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
  • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
  • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
  • G01S11/023—Systems for determining distance or velocity not using reflection or reradiation using radio waves using impedance elements varying with distance
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
  • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
  • F41A21/32—Muzzle attachments or glands
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
  • G01P3/66—Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means
  • G01P3/665—Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means for projectile velocity measurements

Definitions

• the invention is concerned with the subject of the construction length reduction of a particular operated as a waveguide weapon nrohres.
• a waveguide is a tube with a characteristic cross-sectional shape, which has a very good electrically conductive wall. Above all, rectangular and round waveguides are widely used in technology.
• a method of operating the tube as a circular waveguide and measuring the Doppler velocity of the projectile in the tube can be read in EP 0 023 365 A2.
• the frequency of the signal is above the cutoff frequency for the respective waveguide mode.
• the resulting electromagnetic wave propagates in the tube and is reflected by the projectile.
• a double frequency shift dependent on the instantaneous speed results. From this then a muzzle velocity of the projectile is determined.
• DE 10 2006 058 375 A1 proposes to use the weapon barrel or the launching tube and / or parts of the muzzle brake as waveguides. However, this waveguide is operated below the cutoff frequency of the respective waveguide mode.
• the signal generator (eg oscillator) supplies a signal with a constant center frequency, which is below the smallest limit frequency of the waveguide Waveguide is operated.
• the signal generator generates either a carrier in continuous wave mode (CW mode) or a modulated signal.
• the invention provides the task to reduce the length of the waveguide or the weapon nrohres can.
• the invention is based on the idea of shortening the measurement setup by reducing the distance between receiving and transmitting coupler to preferably 0 mm to realize.
• the implementation of this idea is made more difficult by the fact that, if the coupler falls below a certain distance, individual terms can no longer be determined, but so-called sum fields. This makes it necessary to split these sum fields in order to determine the muzzle velocity V 0 .
• the source field caused by the transmitting coupler is first measured, that is to say when no projectile is in the waveguide.
• a characteristic, reflected sum signal results, which is scanned in time in an evaluation device.
• the information about the speed v 0 of the projectile is included ( ⁇ z (t)), but can not be read directly. Therefore, for the realization of the inventive concept, the induced voltage is measured and subtracted from this the source field. The remaining reflected (electromagnetic) sum field is then divided by software into individual terms, so that several speeds are determined over time. From these, an extremely accurate projectile velocity is then determined by averaging.
• the oscillator frequency may preferably be in the range between 40 MHz and 80 MHz, but is not set to a specific value itself. For other calibres, other frequency ranges may be provided. This frequency range (40 MHz and 80 MHz) makes it easy to procure components for this frequency range, especially since component tolerances have no influence on the measurement process. In addition, only low electromagnetic emissions are emitted.
• Fig. 2 shows a measuring device for measuring the projectile speed behind the
• 3 shows a representation of the sequence of the signal processing of both measuring methods.
• FIGS. 1 and 2 1 denotes a waveguide or a weapon or launching tube and / or parts of the muzzle brake in which a transmitter coupler 2 is integrated.
• Fig. 2 is a receiving coupler 4 in the direction of the mouth of the transmitter coupler 2.
• the transmitting coupler 2 is electrically connected to an oscillator 5.
• the two receiving couplers 3, 4 are in turn connected to an evaluation device 6.
• a combination of the arrangement of the two receiving couplers 3, 4 in a measuring arrangement 10 is preferred, but is not required.
• Shot through the waveguide 1 / gun barrel is a projectile 7 whose velocity is to be measured v 0 . This arrangement is already known from DE 10 2008 024 574.7, to which reference is made here.
• the terms of the above expression are constant in time, with the individual terms decaying at different speeds in space. If the projectile 7 is removed or approaches the receiving coupler 3, 4, as described in more detail in FIG. 3, an induced voltage U IND is measured.
• the first term "A" of this formula is constant in time and can be used for calibration, and is preferably measured continuously, but especially shortly before the shot, that is to say when no projectile 7 is still in the waveguide 1. These values are stored continuously, preferably By means of such a calibration, all changes in the constants, which result, for example, from temperature effects in the weapon, are eliminated If, in the case of a shot, the course of the signal U
• the proposed method allows the distance reduction of transmission 2 and receiving coupler 3, 4 of z k to 0 mm, so that the waveguide can be shortened at least in this area.
• the transmitting coupler 2 should be able to assume the task of the (r) receiving coupler 3, 4, so that the induced voltage is measured directly at the transmitting coupler 2.
• the shift register should be sufficiently large. be dimensioned so that, for example, values in measurement intervals of "per second" recorded and thus can be used for the evaluation of all data calibration.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Radar Systems Or Details Thereof (AREA)
• Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
• Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Citations (3)

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• 2009
  • 2009-06-26 DE DE102009030862A patent/DE102009030862B3/de not_active Expired - Fee Related
• 2010
  • 2010-06-17 CA CA2764525A patent/CA2764525C/en active Active
  • 2010-06-17 ES ES10739846.3T patent/ES2487622T3/es active Active
  • 2010-06-17 CN CN201080026710.1A patent/CN102460060B/zh active Active
  • 2010-06-17 WO PCT/EP2010/003637 patent/WO2010149307A2/de not_active Ceased
  • 2010-06-17 EP EP10739846.3A patent/EP2446215B1/de active Active
  • 2010-06-17 PL PL10739846T patent/PL2446215T3/pl unknown
  • 2010-06-17 DK DK10739846.3T patent/DK2446215T3/da active
  • 2010-06-17 JP JP2012516558A patent/JP5654585B2/ja active Active
• 2011
  • 2011-12-05 ZA ZA2011/08923A patent/ZA201108923B/en unknown
  • 2011-12-22 IL IL217171A patent/IL217171A0/en unknown

Patent Citations (3)

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