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launched based upon input radar tracking information. This radar tracking information is available at the
instant the procedure is called. In the following sections, the names of input variables are delimited as
’name’. Terms delimited as #term# are defined in the glossary at the end of this document.
Values of quantities which are parameters of the problem are provided and will determine which
combination of the several possible #Launch Interceptor Conditions# (LIC’s) are relevant to the
immediate situation. The interceptor launch button is normally considered locked; only if all relevant
combinations of launch conditions are met will the launch-unlock signal be issued.
Your procedure will determine whether each of fifteen LIC’s is true for an input set of up to 100
#planar data points# representing radar echoes. The LIC’s are specified in the Functional Requirements
section of this document. To indicate which LIC’s are satisfied by the set of points, the fifteen elements of a
#Conditions Met Vector# (CMV) will be assigned boolean values true or false; each element of the CMV
corresponds to one LIC.
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Another input, the #Logical Connector Matrix# (LCM), defines which individual LIC’s must be
considered jointly in some way. The LCM is a 15x15 symmetric #matrix# with elements valued ANDD,
ORR, or NOTUSED. CMV elements are combined as indicated by the LCM, and the resulting boolean
values are stored in the #off-diagonal elements# of the #Preliminary Unlocking Matrix# (PUM), a 15x15
symmetric #matrix#. Thus, the #off-diagonal elements# of the PUM are an output of your procedure. The
PUM’s #diagonal elements# are an input to your procedure and represent which LIC’s actually matter in
this particular launch determination. Each #diagonal element# of the PUM indicates how to combine the
off-diagonal values in the same PUM row to form the corresponding element of the #Final Unlocking
Vector# (FUV), a 15-element #vector#. If, and only if, all the values in the FUV are true, should the
launch-unlock signal be generated.
No actual reading or writing to physical I/O devices will take place. Instead, inputs to your
procedure will be available as global variables, and outputs from your procedure will be placed in other
global variables.
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HARDWARE AND SOFTWARE SUPPORT
Hardware
Your procedure is to be written using, and must execute on, the PR1ME 750 equipment of the
Academic Computing Center of the University of Virginia.
Software
The only software facilities you may use to prepare your procedure are:
(1) PRIMOS operating system
(2) Software Tools subsystem (optional)
(3) Any text editor available on the above systems
(4) Hull V-Mode Pascal compiler
References
(1) PR1ME User’s Guide, Revision 19.0, Third Edition, by Anne W. Patenaude. Published by PR1ME
Computer, Inc., Framingham, Massachusetts, 1982.
(2) PRIMOS Commands Reference Guide, by Alice Landy. Published by PR1ME Computer, Inc.,
Framingham, Massachusetts, 1981.
(3) Software Tools Subsystem User’s Guide, by T. Allen Akin, et.al., Georgia Institute of Technology,
Atlanta, Georgia, 1982.
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(4) The Hull V-Mode Pascal Compiler, User Manual Version 3.3, by Barry Cornelius, Ian Thomas,
University of Hull, Hull, England, 1982.
(5) Pascal User Manual and Report, Second Edition, by Kathleen Jensen and Niklaus Wirth.
Published by Springer-Verlag, New York, 1974.
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FUNCTIONAL REQUIREMENTS
All communication with software which calls your procedure is to be accomplished through the
global variables and constant defined in this section.
Constant
Available to your procedure is the value of the global constant, PI, representing the number of radians
in 180 degrees.
Input Variables
The values of the following global variables are available to your procedure:
NUMPOINTS Thenumber of #planar data points#.
X,Y Parallel arrays containing the coordinates of data points.
PARAMETERS Recordholding parameters for LIC’s.
LCM LogicalConnector Matrix.
PUM (diagonal elements) Preliminary Unlocking Matrix.
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Output Variables
The values of the following global variables are to be set by your procedure:
PUM (off-diagonal elements) Preliminary Unlocking Matrix.
CMV ConditionsMet Vector.
FUV FinalUnlocking Vector.
LAUNCH Finallaunch/no launch decision.
Global Declarations
The global declarations have been made as follows:
const
PI = 3.1415926535;
type
POINTRANGE = 1..100;
LICRANGE = 1..15;
NPOINTS = 2..100;
NPTYPE = 3..100;
CONNECTORS = (NOTUSED,ORR,ANDD);
NUMQUADS = 1..3;
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