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582<br />

Section 11<br />

Entity Management family<br />

The specification of entity state in<strong>for</strong>mation about an individual entity within a group of ground<br />

logistics vehicles shall be represented by a Grouped Entity Description record 9 - Ground Logistics<br />

Vehicle. The Grouped Entity Description record 9 shall contain the following fields:<br />

a) Entity Identifier. Each entity within a group shall be assigned an entity identifier unique<br />

within that group. The Site Identifier <strong>and</strong> Application Identifiers shall be the same as<br />

those designated in the Group Entity ID, <strong>and</strong> shall not be transmitted. The Entity<br />

Identifier shall be represented by a 16-bit integer.<br />

b) Entity Location. Location of a grouped entity shall be specified by a set of three offsets: xoffset,<br />

y-offset, <strong>and</strong> z-offset. These offsets shall be determined by the difference, in meters,<br />

of the grouped entity from the Group Reference Point. Each offset shall be represented by<br />

a 16-bit signed integer.<br />

c) Entity Appearance. Entity Appearance of a grouped entity shall be identical to that<br />

specified by an Entity State PDU Appearance record. This record shall be defined as a 32bit<br />

record of enumerations (see 5.2.12 in IEEE Std 1278.1-1995). Values <strong>for</strong> the fields<br />

contained in this record are defined in Section 4 of this <strong>document</strong>.<br />

d) Entity Orientation. Orientation of a grouped entity shall be specified by three Euler<br />

angles, psi, theta <strong>and</strong> phi, in 25 milliradian increments. Each angle shall be represented<br />

by an 8-bit signed integer.<br />

e) Entity Speed. Speed of a grouped entity shall be the signed magnitude value of the entity’s<br />

absolute velocity vector. A negative value shall indicate that the entity is moving<br />

backwards. Entity Speed shall be specified in meters per second, <strong>and</strong> shall be represented<br />

by an 8-bit signed integer.<br />

The <strong>for</strong>mat of the Grouped Entity Description record 9 - Ground Logistics Vehicle shall be as shown<br />

in Figure 11-3-9.<br />

Figure 11-3-9⎯Grouped Entity Description record 9 - Ground Logistics Vehicle<br />

Entity ID Entity -16-bit unsigned integer<br />

x-Offset⎯16-bit signed integer<br />

Entity Location y-Offset ⎯16-bit signed integer<br />

z-Offset⎯16-bit signed integer<br />

Entity Appearance 32-bit record of enumerations<br />

Psi ( Ψ)⎯8-bit signed integer<br />

Entity Orientation Theta (θ)⎯8-bit signed integer<br />

Phi (φ)⎯8-bit signed integer<br />

Entity Speed 8-bit signed integer<br />

Grouped Entity Description record 9 Total Size = 128 bits

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