FIRE CONTROL RADAR

In the on-line mode, the sensor station 3 keyset generates primary control signals, which are processed through the central computer, logic unit No. 1 (LU 1), and the RIU. The antenna control provides signals to control the radar scan functions and tilt servo loop stabilization. The two radar control boxes control the sensitivity time adjustments, receiver gain, fast time constant, automatic frequency control, and video test of the respective RT. FIRE CONTROL RADAR Learning Objective: Recognize operating modes and system controls used in a fire control radar. The 11D13A radar maintenance trainer device is discussed in the following text. This system was selected because an actual operational system would require that classified information be included. Because the trainer is different from an operational system in some respects, these differences are noted when discussion will not violate security regulations. The 11D13A trainer device includes all the elements essential for basic search radar ranging —transmitter, receiver, antenna, and synchronizer circuits. Additional elements, including tracking, stabilization, and target generation (simulated targets), allow operation as either a fire control (intercept) radar or a bomb director radar. The target generator unit, although not usually contained in operational radar systems, produces a three-dimensional target that is controllable in azimuth, range, and elevation in a manner typical of analog computing systems. It contains both mechanical and electronic elements found in analog computing systems. A block diagram of the trainer is shown in figure 3-9. The ranges in the trainer vary from 0 to 80,000 yards. An actual weapons control radar has much longer ranges, which are normally expressed in miles. OPERATING MODES The 11D13A trainer is capable of operating in three basic modes-search (PPI), fire control, and bomb director. Fire control is divided into five Figure 3-9.-Trainer 11D13A functional block diagram. 3-9