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The KGGB ( Korean GPS Guided Bomb; ), or simply GGB, is a guided glide bomb system, attached to MK-82 conventional general-purpose bomb. The KGGB is capable of striking targets from long-distances and features fire-and-forget capability. It was developed by the Agency for Defense Development (ADD) and LIG Nex1.
When the pilot enters the coordinate values for target strikes into the PDU, the coordinate information is stored in the guidance kit, ready to drop the bomb. Guided bombs with military GPS receivers with a built-in Selective availability anti-spoofing module (SAASM) can strike targets along a flight path set to Unpowered flight after being dropped, and can also immediately modify the path to strike the rear of the target.
The guidance kit is combined with a special main wing assembly called Flaperon that can control flight direction, flight altitude and Airspeed. This wing assembly controls the flight direction by adjusting the lift force of the wing during flight, or acts as a flight altitude increase, deceleration or flight altitude decrease, acceleration of flight speed, and serves to fly further away and accurately hit the intended target. The Flaperon enables it to execute a turning attack on an enemy target concealed behind a hill or mountain while also contributing to stable posture control in challenging wind conditions.
The guidance system also supports two distinct flight modes, providing tactical flexibility. The Circle mode allows the bomb to orbit the target and approach from a desired direction, while the Waypoint mode enables it to follow a pre-set flight path, bypassing threat areas to safely reach its target. The KGGB also features a Target angle adjustment function. This allows pilots to precisely set the bomb's final descent angle, with a range of 20 to 75 degrees. This functionality is critical for engaging targets in complex environments, such as those hidden behind natural terrain or urban structures.
The KGGB is equipped with a Yamartino method that analyzes and compensates for surrounding wind speed and direction in real-time during its flight. Given that wind speeds increase significantly with altitude, this feature plays a crucial role in maximizing both the weapon's range and its terminal accuracy. By continuously adjusting its flight path based on these real-time atmospheric conditions, the KGGB can maintain its trajectory and ensure a precise strike, even on distant targets. The system incorporates advanced altitude management technology to ensure precise target engagement. This technology controls the bomb's excess kinetic and potential energy to guide it into the target accurately. Because the KGGB is equipped with Flaperons, which generate lift, the system can regulate the bomb's descent speed during the final attack phase. This prevents the bomb from overshooting the target and ensures a highly accurate strike.
The KGGB's GPS-aided INS devices allow the bomb to attack targets independently, and the fighter can safely return to the base immediately after the bomb is dropped, ensuring fighter and pilot viability. The KGGB is a standalone type guided weapon that can be mounted on F-4 Phantom, F-5 Tiger, F-15K Slam Eagle, F-16 Fighting Falcon, FA-50 Fighting Eagle and KF-21 Boramae fighter jets and is remotely controlled by the portable pilot display unit without the need for further modifications or systems to the aircraft.
ADD and LIG Nex1 are developing advanced versions of the KGGB, creating a multi-purpose precision-guided bomb. These variants will incorporate an Graphite bomb and an aerial mine delivery system. The KF-21 Boramae and future FA-50 aircraft will be equipped with a KGGB Interface Unit (KIU), allowing them to control up to four of these bombs.
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