对于红外预警系统，目标定位的最大难点是观测量只有角度，没有距离，这就使得火控系统的目标导引遇到困难。
For infrared surveillance system, it is most difficult that the measurements are only angles not distance, which makes target location of fire control system be difficult to realize.
配备JDAM的炸弹，是由一惯性导引组合系统，耦合到全球定位系统(GPS)接收器来导引，赋予其高达15海里(28公里)公布的范围。
JDAM-equipped bombs are guided by an integrated inertial guidance system coupled to a Global Positioning system (GPS) receiver, giving them a published range of up to 15 nautical miles (28km).
该系统的主要组件，包括一个具有表面空气动力控制的尾段，一个(身体)稳流边条套件，以及组合惯性导引系统和GPS全球定位导引控制基件。
The key components of the system consist of a tail section with aerodynamic control surfaces, a (body) strake kit, and a combined inertial guidance system and GPS guidance control unit.
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