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Asahi-class 25DD Multipurpose Destroyer - Electronics

One important feature makes the Asahi class unique: the ship's sensor system. According to some sources, Asahi is the first Japanese warship to be equipped with a GaN-AESA (gallium nitride - active electronically scanned array) GaN-AESA (3D) phase radar. Asahi's radar OPY-1 is designed based on Akizuki's AESA OPS-50 radar system but uses gallium-nitride material technology to improve operational ability. The use of GaN technology, which can operate at higher temperatures than GaAs technology, allows switching cooling methods from liquid to air-cooled, reducing the required size of the hardware to Create a specific energy level while reducing the amount of power consumption and cooling needed. In addition, OPY-1 radar is made from available hardware in the market.

The OPY-1 has a higher performance, a lower probability of losing its target, a larger range of operation, and a higher accuracy than that of the OPS-50. For air defense systems, it is essential to improve the receiver's sensitivity and enhance its anti-jamming capability. It ensures that the whole system can accurately detect the target, follow and kill targets in a natural and artificial noise environment. OPY-1 has separate signal processors for each band working together with modern anti-jamming system, advanced touch wave display and especially high level of automation.

The OPS-1 dual band radar consists of 8 large and small antenna arrays placed side by side. Large antenna arrays operate at C band (wavelength from 7.5 to 3.75 cm) used to monitor and monitor targets. Each large antenna array has the ability to automatically detect, track air and sea targets at the same time with a number of up to 300 targets. When the target is detected, the antenna array array will automatically assess the threat and provide parameters for the fire control antenna array. Unlike the dm AN / SPY-1D wave band radar of the Kongo-class ship, the Japanese cm band radar is capable of detecting small size targets at distances up to 200 km. However, in terms of intercepting a long-range target, Asahi cannot match Kongo's ability because the powerful AN / SPY-1D radar has the ability to control the situation even in low orbits near the earth. The small antenna array operates in the X band (wavelength from 3.75 to 2.5 cm) with fire control function. After taking parameters from the antenna array array, the antenna's processor will track and determine the target type, it also controls the release and irradiation after the missile is launched. The system is capable of navigating both anti-ship missiles, anti-ship missiles and gunboats, while maintaining the ability to defend the battle group against various threats. In addition, OPY-1 has integrated a system to monitor low and low flying targets, identify threats from land and sea and coordinate systems between two C-X bands.

The OYQ-13 combat navigation system is equipped with AN / UYQ-70 control computer system of Lockheed Martin Group (USA). Information obtained from the fire control system FCS-3A, OQQ-22 anti-submarine warfare control system and the integrated NOLQ-3D ESM / ECM electronic warfare system will be focused on the system. Then, with the ability to calculate super speeds of up to 10 Mbit / s, the computer system automatically assesses threats, prioritizes targets, plans and selects weapons to destroy. OYQ-11 systems are designed in the form of open modules to create high flexibility in combat operations and easily conduct future revision and upgrades.

The connection of electronic systems on board is carried out through the wide area network system NOYQ-1B. This system connects all onboard equipment via high-speed fiber optic system in the form of Gigabit Ethernet. As a result, the ship's ability to react and handle situations is significantly improved. NOYQ-1B is assessed to be equivalent to the wide area network on the Zumwalt class destroyer of the US Navy.

The ship is equipped with navigation radar, OPS-20C navigation, helicopter data link system (TACLINK) ORQ-1C-2, anti-submarine warfare control system and integrated electronic war system NOLQ-3D ESM / ECM. The anti-submarine warfare control system includes the new OQR-4 tow plate type sonar and the master / passive combined sonar that detects and locates the OQQ-24 submarine fixed in the teardrop-shaped sphere bow. Herhi's "soft-kill" method includes the electronic warfare system NOLQ-3D ESM / ECM and the bait trap system MK-137 SRBOC (4 x18-launchers located in the middle of the hull ). The NOLQ-3D ESM / ECM electronic warfare system is used to detect radio signals from enemy radar and missile radar, and signal interference to disturb the anti-ship missile radar detectors, causing them to follow virtual targets or reduce the effectiveness of the probe, allowing ships to avoid missiles. The Mk-137 SRBOC system is often combined with the NOLQ-3D ESM / ECM electronic warfare system. Its mechanism of action is to launch rockets that drop aluminum foil, creating a false target, confusing the missile's sensors.

In addition, the ship also has AN / SLQ-25 Nixie plate-type torpedo decoy system manufactured by Argon ST Fairfax, Virginia. AN/SLQ-25 Nixie includes a number of decoys that are pulled by cable behind the ship. These are able to simulate the sound emitted to the frequency of in-ship devices such as engines and engines with greater intensity to entice torpedoes using a passive sonar probe. on its side instead of rushing towards the warship.

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