User's Manual Part 4

ECHNICAL

OCUMENTATION

ROTECTING

EOPLE AND

SSETS

ATE

ARCH

2017

ERSION

1.8

ANGER

ADAR

YSTEM

OBILE

)

UNCTIONAL

VERVIEW AND

HEORY OF

PERATION

EEC

OMPANY

ROPRIETARY

encoders and convert them to an absolute angle. The Aquarian performs this when a restart of the

controller causes the loss of the zero set point on an axis and there is a request for servo power. In

azimuth, the motor is driven clockwise until the homing sensor is detected and the quadrature

decoder hardware is reset to zero. In elevation, the motor is driven until it reaches the lower electrical

limit. Once the lower electrical limit is detected, the motor will drive in the opposite direction until it

detects the homing sensor. At that point, the quadrature encoder hardware is reset to zero.

4.6.

Communication Interface

The radar uses an Ethernet network (see Figure 68) to provide command and control of the radar

set and to receive status flags and BITE information. Three Ethernet switches provide connection

points for all the I/O and controlled devices in the Control Cabinet, the Pedestal Enclosure, and RF

Enclosure.

Ethernet communications between the Pedestal and the Control Cabinet are provided over a fiber-

optic connection by the use of Ethernet Switches with Fiber-Optic Media Converters in the Control

Cabinet and Pedestal Enclosure. Communications within the Pedestal is possible by the use of the

Ethernet connection through the Slip-ring Module. Communications between the Radar and the

local host computer are provided through the rear panel of the Control Cabinet. Additional ports on

the front and rear of the Control Cabinet provide access to the radar network for expandability and

testing.

Received data from the IQ2-IFD, on the Pedestal, is transmitted via a fiber-optic cable through the

Fiber-Optic Rotary Joint to the downlink input and the IQ2-DSP. Uplink information is transmitted

from the IQ2-DSP over the Ethernet network to the IQ2-IFD.