Figure 4-32.--Block diagram of the roll and pitch follow-up system.

gimbal ring. It positions the roll-pitch phantom about

roll-pitch phantom and the level position maintained by

the roll axis, through the gimbal ring.

the two gyros. It also positions the roll and pitch synchro

data transmitters. The system consists of two E-core

On a north-south course, the pickoff signal from the

pickoffs, two follow-up amplifiers, and two follow-up

meridian gyro roll-pitch pickoff, if fed through the pitch

motors, all duplicates of the corresponding components

follow-up amplifier to the pitch follow-up motor, would

in the azimuth follow-up system. In addition, the system

compensate for the effect of pitch. Similarly, if the

includes a roll-pitch resolver.

pickoff signal from the slave gyro roll-pitch pickoff

were fed through the roll follow-up amplifier to the roll

The meridian gyro roll-pitch pickoff is mounted on

follow-up motor, it would compensate for the effect of

the meridian gyro cradle and detects any misalignment

roll.

between the cradle and the meridian gyro's vertical ring.

This misalignment is about the meridian gyro's

On an east-west course, however, the meridian gyro

east-west horizontal axis. The roll-pitch phantom, being

roll-pitch pickoff would have to be fed to the roll

physically linked to the azimuth phantom, will be

follow-up amplifier and motor, to compensate for roll,

identically misaligned with the vertical rings of both

and the slave gyro roll-pitch pickoff would have to be

gyros.

fed to the pitch follow-up amplifier and motor, to

The slave gyro roll-pitch pickoff is mounted on the

compensate for pitch. It follows, therefore, that on any

slave gyro cradle and detects any misalignment between

intermediate course, the roll-pitch motions of the ship

will have components acting about both north-south and

the cradle and the slave gyro's vertical ring. This

misalignment is about the slave gyro's north-south

east-west axes, and both roll -pitch pickoffs will react to

horizontal axis. Thus, any misalignment between the

both roll and pitch. As a result, the two pickoff signals

must be divided into proper proportions to each

roll-pitch phantom and the vertical ring of either gyro

follow-up amplifier and motor to maintain the

produces a roll-pitch pickoff signal.

horizontal stability of the roll-pitch phantom. The own

A pitch follow-up motor is mounted on the gimbal

ship's course determines these proper proportions, and

ring and meshed with the pitch gear on the roll-pitch

they are obtained from the roll-pitch resolver.

phantom. It positions the roll-pitch phantom about the

pitch axis. A roll follow-up motor is mounted on the

The roll-pitch resolver has its rotor positioned

support assembly and meshed with the roll gear on the

corresponding to own ship's course by the azimuth

Figure 4-32.--Block diagram of the roll and pitch follow-up system.

4-30