19-06-2012, 05:05 PM
CLOSED LOOP FIELD OF VIEW(FOV) OF ELECTRO OPTIC PAYLOAD
CLOSED LOOP FIELD .docx (Size: 22.39 KB / Downloads: 30)
INTRODUCTION:
• Gimbal(part of unmanned arieal vehicle) houses many of the sensors and electro optic(camera) is one of them which used to capture/tracking of objects.
• The zooming parameter of the camera is controlled by the rotation of the motor.
• The angle of rotation of a motor shaft is controlled by the closed loop control signal generated by the microcontroller ADUC7020/ADUC7026.The speed of the shaft varies wrt applied potential difference b/w two terminals of the motor.
• The motor is controlled to rotate its shaft with precise angle(varies in steps) with a feedback loop in control unit which in term varies the zooming parameter of EO(camera).
• The closed loop system involves differential line receiver ,shaft encoder , counter(32 bit) ,software generated amplifier , integrator to reach the desire requirements.
• The input and feedback signal is continuously monitored and when there exists a difference, it is amplified and rotates the shaft by precise angle which in turn varies the zooming of a camera.
HARDWARE TOOLS
ADUC 7020 Microcontroller:
• Multichannel,12bit, 16 ADC channels
• ARMTDMI Core 16/32 bit RISC architecture
AEDA-3300 SERIES ENCODER:
• Three channel output
• Resolution options from 600 to 20000 CPR
HCTL-2032: CMOS IC that performs the quadrature decoder and counter.