Meridian Gyro Control System

Slave Gyro Control System

major systems; the meridian gyro control system, the

slave gyro control system, the azimuth follow-up

The slave gyro control system (fig. 4-26, view B)

system, and the roll and pitch follow-up system.

consists of the slave gyro gravity reference, leveling

control, and slaving control systems, and the slave gyro

Meridian Gyro Control System

constant torque compensation.

The meridian gyro control system includes the

gravity reference system, the azimuth control system,

SLAVE GYRO GRAVITY REFERENCE

and the leveling control system. These systems are

SYSTEM.-- The slave gyro gravity reference system is

similar to the Mk 23 compass control system, and they

similar to the meridian gyro gravity reference system. It

function to control the meridian gyro in the same

consists of a gravity reference, a mixer and its network and

manner. The compass compensation system is more

the east-west acceleration computer. The output of the

elaborate, due to the high degree of accuracy required

system is the slave gyro compensated tilt signal, which

of the Mk 19 Mod 3A gyrocompass, and will be

is fed to the slave gyro leveling control system, and the

discussed separately.

slave gyro constant torque compensation system.

MERIDIAN GYRO GRAVITY REFERENCE

SLAVE GYRO LEVELING CONTROL

SYSTEM.-- The gravity reference system (fig. 4-26,

SYSTEM.-- The slave gyro leveling control system

view A) consists of the meridian gyro gravity reference

consists of a mixer, a leveling torque amplifier, and a

(the electrolytic bubble level and excitation

leveling torque. The input signals to the mixer are the

tmnsformcr), the north-south acceleration computer, a

compensated tilt signal from the slave gyro gravity

mixer, and its associated network.

reference system, and the horizontal earth rate, the east-

west speed, and the constant torque compensation sig-

The tilt signal from the electrolytic bubble level is

nals. The leveling torque, amplifier and leveling torque

fed into the mixer. Here, the tilt signal is mixed with the

arc duplicates of those used in the meridian gyro level-

north-south acceleration signal (a compensation signtil

ing control system. The output of the leveling torque

m be discussed later), and the compensated tilt signal is

amplifier is sent to the leveling torque control field.

fed into a net work of resistors, potentiometers, and relay

contacts. me network has three output signals: the

SLAVE GYRO SLAVING CONTROL

meridian control signal to the azimuth control system,

SYSTEM.-- The slaving control system detects any mis-

the damping signal to the leveling control system, and

alignment between the azimuth phantom and the slave

the compensated tilt signal to the meridian gyro constant

gyro, and slaves the gyro to its proper east-west position.

torque compensation system.

The system consists of the slaving pickoff, the slaving

signal amplifier, the slaving torque amplifier (STA), and

MERIDIAN GYRO AZIMUTH CONTROL

two slaving torquers. The slaving pickoff is an E-core

SYSTEM.-- The azimuth control system consists of a

transformer mounted on the vertical ring. The armature

mixer, an azimuth torque amplifier, and the azimuth

of the pickoff is cemented to the gyrosphere. Thus, a

torquers. (See fig, 4-26, view A.) The mixer input

misalignment signal between the azimuth phantom and

signals are the meridian control signal from the gravity

the slave gyro is obtained from the pickoff in the same

refertnct system, an east-west speed signal from the

manner as described in the Mk 23 system. This signal is

tangent latitude computer, and a vertical earth rate

fed into the slaving signal amplifier. The output of the

compensation signal from the latitude computer. The

slaving signal amplifier is the slaving signal, and it is

azimuth torque amplifier output is fed to the control

fed to the slaving torque amplifier. The output of the

fields of the two azimuth torquers, which apply torque

slaving torque amplifier is the slaving control signal,

to precess the meridian gyro, toward the meridian, in the

and it is fed to the slaving torque control fields.

same manner as described in the Mk 23 system.

The slaving torquers are duplicates of the azimuth

MERIDIAN GYRO LEVELING CONTROL.

torquers and operate in the same manner. They produce

SYSTEM.-- The meridian gyro leveling control system

the torque about the slave gyro horizontal axis, which

(fig. 4-26, view A) consists of a mixer, the leveling

causes precession about the vertical axis to align the

cent amplifier, and the leveling torque. The input

slave gyro with the azimuth phantom.

signals to the mixer arc the dumping signal from the

gravity reference system, and the north-south speed plus

Compensation Signals

drift compensation signal. The amplifier output supplies

There are nine compensation signals in the Mk 19

the leveling torque control field, which produces the

Mod 3A gyrocompass system. These signals serve to

torque to level the meridian gyro.

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