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A laser beam source and an operating method thereof is provided for a directional infrared countermeasures (DIRCM) weapon system for defensively countering guided missiles having infrared seeking heads, by directing an infrared laser beam at the guided missile so as to disorient, saturate, or irreve

A laser beam source and an operating method thereof is provided for a directional infrared countermeasures (DIRCM) weapon system for defensively countering guided missiles having infrared seeking heads, by directing an infrared laser beam at the guided missile so as to disorient, saturate, or irreversibly destroy the IR detectors and circuitry arranged in the target seeking head. The power, pulse frequency and spectral composition of the laser beam is adjustable and selectable as required to adapt to any particular defensive engagement. To achieve this, the laser beam source comprises an Nd:YAG pumping laser and an optical parametric oscillator including an oscillator crystal arranged in a resonator cavity. The crystal includes a plurality of different periodically polarized crystal zones having different lattice constants. The adjacent zones can be grouped together into selectable crystal zone groups. The beam cross-section of the pumping laser beam corresponds to the cross-section of a single crystal zone or of a crystal zone group encompassing plural zones. The crystal is arranged on a slide table that is slidably displaceable by a servomotor, to move a selected crystal zone or group into the path of the pumping laser beam. Thereby the wavelength components and the relative intensities thereof of the output laser beam can easily be selectively adjusted.

대표청구항 ▼

A laser beam source and an operating method thereof is provided for a directional infrared countermeasures (DIRCM) weapon system for defensively countering guided missiles having infrared seeking heads, by directing an infrared laser beam at the guided missile so as to disorient, saturate, or irreve

A laser beam source and an operating method thereof is provided for a directional infrared countermeasures (DIRCM) weapon system for defensively countering guided missiles having infrared seeking heads, by directing an infrared laser beam at the guided missile so as to disorient, saturate, or irreversibly destroy the IR detectors and circuitry arranged in the target seeking head. The power, pulse frequency and spectral composition of the laser beam is adjustable and selectable as required to adapt to any particular defensive engagement. To achieve this, the laser beam source comprises an Nd:YAG pumping laser and an optical parametric oscillator including an oscillator crystal arranged in a resonator cavity. The crystal includes a plurality of different periodically polarized crystal zones having different lattice constants. The adjacent zones can be grouped together into selectable crystal zone groups. The beam cross-section of the pumping laser beam corresponds to the cross-section of a single crystal zone or of a crystal zone group encompassing plural zones. The crystal is arranged on a slide table that is slidably displaceable by a servomotor, to move a selected crystal zone or group into the path of the pumping laser beam. Thereby the wavelength components and the relative intensities thereof of the output laser beam can easily be selectively adjusted. anking component has a transmission authorization in a time interval which is measured from a transmission time of a component having a highest priority ranking, based on a maximum transmission time of a signal on the data bus. 3. The data bus according to claim 1, wherein a component does not transmit if a time period remaining between a transmission authorization for said component and a time for outputting a following synchronizing pulse is shorter than a duration of transmission of the component. 4. The data bus according to claim 2, wherein a component does not transmit if a time period remaining between a transmission authorization for said component and a time for outputting a following synchronizing pulse is shorter than a duration of transmission of the component. 5. The data communication network according to claim 1, wherein the plurality of subscriber components are interconnected via the active star coupler. 6. The data bus according to claim 1, wherein the components send a status signal in a normal mode. 7. The data bus according to claim 2, wherein the components send a status signal in a normal mode. 8. The data bus according to claim 1, wherein the synchronizing pulse has different durations which correspond to different conditions of devices assigned to the data bus. 9. The data bus according to claim 2, wherein the synchronizing pulse has different durations which correspond to different conditions of devices assigned to the data bus. 10. The data bus according to claim 8, wherein the conditions of devices assigned to the data bus are defined by a transmission mode of a specific component. 11. The data bus according to claim 1, wherein the synchronizing pulse is transmitted by a component. 12. The data bus according to claim 2, wherein the synchronizing pulse is transmitted by a component. 13. A method of operating a data network which includes a plurality of subscriber components coupled in data communication via a data bus that is controlled by a bus master, said method comprising: said bus master generating a train of synchronization pulses; between consecutive synchronization pulses, said subscriber components transmitting data via said data bus in an order determined according to a predetermined transmission priority hierarchy; wherein a cycle time between consecutive synchronization pulses is greater than a duration of a transmission of a subscriber component having highest priority and less than a cumulative transmission time necessary for all subscriber components to transmit via the data bus. 14. The method according to claim 13, wherein a particular subscriber component does not transmit if a time remaining prior to expiration of a current cycle is less than a duration required for transmission by the subscriber component. 15. The method according to claim 13, wherein: following a particular synchronization pulse, a first next consecutive synchronous pulse is delayed if a component has not completed transmission of data prior to the end of a current cycle; and a second next consecutive synchronization pulse is generated at a time measured from said particular synchronization pulse. 16. A data communication network having a plurality of subscriber components coupled in data communication via a data bus that is controlled by a bus master, wherein: said bus master generates a train of synchronization pulses; between consecutive synchronization pulses, said subscriber components transmit data via said data bus in an order determined according to a predetermined transmission priority hierarchy; and a cycle time between consecutive synchronization pulses is greater than a duration of a transmission of a subscriber component having highest priority and less than a cumulative transmission time necessary for all subscriber components to transmit via the data bus. 17. The data communication network according to claim 16, wherein a particular subscriber component does not transmit if a ti me remaining prior to expiration of a current cycle is less than a duration required for transmission by the subscriber component. 18. The data communication network according to claim 16, wherein: following a particular synchronization pulse, a first next consecutive synchronous pulse is delayed if a component has not completed transmission of data prior to the end of a current cycle; and a second next consecutive synchronization pulse is generated at a time measured from said particular synchronization pulse. Policy-based Packet Forwarding Using Efficient Multi-dimensional Range Matching," Proc. SIGCOMM 98, Vancouver, Sep. 1998, p. 203-214.