Detroit, Michigan 48232
Phone: 875-2260, Ext. 2234
Richard J. Brady
Defense, Space and Special Systems Group
Phone: NIagara 4-6962
Radar Course Directing Group for the Back Up Interceptor
Control System (BUIC)
DESCRIPTION: BUIC is a semi-automatic backup to SAGE which
provides for conduct of the air battle in the event that
portions of SAGE become inoperative. Burroughs Corporation
is providing the AN/GSA-51 Radar Course Directing Group
which functions as the central control for Air Surveillance
and Weapons Control for the BUIC system and includes the
following general capabilities:
of radar data from long range radars.
of tracks based on radar input presentation of
this data for evaluation by operators.
of capability for manual track information and
automatic maintenance of tracks.
of available weapons to permit pairing with tracks
and manual commitment.
analysis of commitment to assure intercept ability.
transmission of pre-launch and fire command based
on operator input.
generation and transmission of guidance commands.
consists of a Burroughs D825 modular data processing system.
It is in the modular data processor that the operational
program is stored and executed. For the BUIC application,
two computer modules, six memory modules and three input/output
modules are utilized. Data exchange occurs simultaneously
between any memory and any computer or input/output module.
The modular nature of the equipment not only permits operation
of the system when some modules are inoperative, but also
permits convenient expansion to increase capability. The
data processor can be readily expanded to up to four computers,
16 memories and 20 input/output modules with no obsolescence
of hardware or software. Input/output modules for the BUIC
system consist of message processors and controller-comparators.
accepts radar information from long range radar sites via
the message processors. The data is temporarily stored,
formatted into computer words, and transferred to core
memory via a controller-comparator. Controller-comparators
handle data transfers between core memory and all devices
operating on the data stored in core memory, performs all
the computations necessary for generating appropriately
formatted display data. The display data, stored in core
memory, is transferred via a controller-comparator to the
display fields of a drum, which in turn automatically presents
this data to each display console 30 times each second.
To accomplish all of this, the computer executes a succession
of program segments called up from the drums.
data available at each display console, which includes
up to 12,288 symbols or vector segments, is selected by
an operator by means of 15 category selectors. Radar data
displayed includes current data together with up to seven
history points to permit track initiation. Once the operator
initiates a tracking action by means of a light pen on
the display, the computing system automatically maintains
the track by prediction and examination of incoming data
for correlation. Height requests are automatically generated
and transmitted based on track priority, or may be operator
it is established that defensive action is to be taken,
the operator can call up weapons status information, which
is being continually updated via card reader inputs. He
can then call upon the computer for solutions to possible
intercepts, the solutions being made to appear at the requesting
display console. Once a weapon is assigned, the computer
generates the necessary launch and guidance commands, and
the track on the weapon is initiated automatically. The
launch and guidance commands, stored momentarily in core
memory, are accepted by the message processor, formatted,
and transmitted over the appropriate communication lines.
All the while, messages are being exchanged as required
with adjacent air defense sectors.
equipment performs support functions. Magnetic tape units
are used for simulation inputs and recording for training,
and backup storage for programs. A typewriter is a backup
input for the card reader and is also used in system maintenance.
A status display console presents indications of which
units are "on-line," or "in test," or in a failed state.
It also houses the central power control to assure orderly
system shutdown without loss of stored data in the event
of a power failure. A line printer provides high-speed
printout to permit rapid program evaluation and change,
and evaluation of test missions. Simulator message composers
are training aids for weapons director, for both initial
training and maintenance proficiency.
the D825 is a functionally modular data processing system,
it is possible to achieve increased availability without
full duplexing. This is accomplished by providing additional
modules of the computer, memory, input/output module and
an additional display. While the operational program is
functioning, an error recovery program is being cycled
in one computer, one memory, and one controller-comparator.
are continually exchanged between the "backup" and operational
group and other modules are continually checked. The operational
program continually stores "safe data" to permit recovery
from a temporary computation interruption. If an error
is indicated, the operational computation is temporarily
suspended and the system is turned over to the error recovery
diagnostics program, which identifies the faulty module
and notifies the operator via the status console and typewriter
printout. The system is returned automatically to the operational
function with information on what modules are available
for use, and the operational program reconfigures, utilizing
the safe data previously stored. This recovery period will
vary from about 15 to 30 seconds. The failed module is
then further analyzed, repaired and returned to the operational