0195136047.pdf

16.3 DIGITAL CONTROL SYSTEMS 809

−

Prefilter

s

−

Rate gyro

A/D

converter

Positiontransducer

Positioncommand (a)

θ

Position

θ

D/A

converter

Airframedynamics

1

Digitalcontroller

−

+

Prefilter

s

−

+

Rate gyro

Hold

A/D Hold

converter Positiontransducer

T^2

sampler

T^1

sampler

Positioncommand (b)

θ

Position

θ

D/A

converter

Airframedynamics

1

Digitalcontroller

Figure 16.3.4

(a)

Single-axis autopilot control system with digital data.

(b)

Single-axis digital autopilot control system with multirate

sampling.