The surface search radar consists of the AN/SPR-9A radar set that is comprised of units 10 through 15 (fig. 10-12).

Unit 10-Radar receiver

Unit 11-Frequency converter

Unit 12-Transmitter

Unit 13-Antenna

Unit 14-Radome

Unit 15-Control amplifier

The AN/SPQ-9A is the prime sensor of surface targets for the Mk 86 FCS. The radar is also equipped with circuitry for the reception and interrogation of a radar beacon (described later).

Air Action Radar

The air action radar consists of the AN/SPG-60 radar set and the tracking radar of the system that provides the director/radar inputs to the computer. The system is comprised of units 17 through 19 and 21 through 23 (fig. 10-12).

Unit 17-Antenna

Unit 18-Radar receiver

Unit 19-Radar transmitter

Unit 21-Antenna control

Unit 22-Signal data converter

Unit 23-Power distribution control

The antenna is mounted with a TV sight that allows the WCC operator to track targets visually. The same antenna is used in variations that supply CWI with the addition of a waveguide and feedhorn for CWI transmission.

Data/Video Units

The data/video units consist of a signal data translator (unit 6), a signal data converter (unit 20), and a video processor (unit 25). The signal data translator interfaces the computer with other units of the Mk 86 FCS. The signal data converter converts gun position synchro signals for use by the signal data translator. The video processor operates in conjunction with the computer system to acquire, track, and develop position and rate data for targets detected by the AN/SPQ-9A radar set. The video processor receives raw data from the radar and correlates it with present and previous radar echoes to provide a high-detection probability and low incidence of false alarms.

Optical Sighting System

The optical sighting system (unit 4) consists of a gimbal-mounted TV camera (separate from the one mounted to the AN/SPG-60 antenna). The sight permits the WCC operator to monitor and track targets visually. The sight can be positioned automatically by the computer or manually by the WCC operator.

MK 92 FIRE CONTROL SYSTEM

The Mk 92 fire control system (FCS) is installed primarily on FFG-7 class ships. The system, in conjunction with the Mk 13 Mod 4 GMLS and the 76-mm Mk 75 gun, is capable of simultaneously detecting, tracking, and engaging multiple air and surface targets. Much of the terminology and some of the components, associated with the Mk 92 FCS, are similar or identical to those used in the Mk 86 FCS. Both systems, for instance, use the AN/UYK-7 general-purpose computer set to perform all the fire control calculations. Watch for other similarities as we describe the functions of the major components of this system. The system consists of the following major components:

Combination antenna system (CAS) and radar

Separate track and illuminating radar (STIR)

Weapons control processor (WCP)

Data exchange auxiliary console (DEAC)

Planned position indicator (PPI) display console

Combined Antenna System

The combined antenna system (CAS) consists of search and track antennas mounted on a stabilized platform and enclosed in a radome (fig. 10-13). The search antenna provides air and surface surveillance but can also be used to track a limited number of targets while scanning. The search antenna is also equipped with IFF for target interrogation.

The CAS track antenna is primarily used for three-dimensional (three-coordinate) tracking of air targets. The antenna is also equipped with a continuous wave illumination (CWI) horn to provide target illumination for the guidance of Standard semiactive missiles.

Figure 10-13.-The combination antenna.

Both antennas are part of the same radar unit. Both are controlled and operated from the CAS weapon control console (WCC). The CAS WCC is a two-operator console. One operator is responsible for the acquisition, the tracking, and the engagement of air targets by gun or missile. The second operator is responsible for the tracking and engagement of surface targets. The console is interfaced with the weapons control processor (WCP). In the normal mode of operation, the WCP designates targets for engagement by the CAS operators.