Figure 3-2.--Stabilized glide slope indicator system.

electrical and electronic components required to control

SGSI SYSTEM COMPONENTS

the major components of the system.

The assemblies that comprise the SGSI system are

To understand the system operation, you must un-

as follows (fig. 3-2):

derstand feedback control systems. A feedback control

Electronic enclosure assembly

system compares an input signal with a reference signal

and then generates an error signal. This error signal is

Remote control panel assembly

then amplified and used to drive the output in a direction

Hydraulic pump assembly

to reduce the error. This type of feedback system is often

referred to as a servo loop. A gyro, mounted on the

stabilized platform, acts as the reference of the system.

GSI assembly

Since the gyro is stable, synchro transmitters located on

the gimbals will sense any motion of pitch or roll. As the

Stabilized platform assembly

ship begins to pitch or roll, an error signal is developed

by the synchro transmitter stators. Look at the block

ELECTRONICS ENCLOSURE ASSEMBLY

diagram in figure 3-4 and follow the path of the error

signal through the electronic enclosure assembly. (The

The electronics enclosure assembly (fig. 3-3) is the

block diagram represents either the pitch or the roll

signal processing distribution and control center for the

control loops. They are identical electrically.)

system. It contains the circuits, amplifiers, and other

Figure 3-2.--Stabilized glide slope indicator system.

3-2