DIS Data Dictionary - PDU Data

Created by JDBE at Ft. Huachuca, Arizona

Current standard: IEEE 1278.1


Transmitter PDU

Size: 1160
Description: Detailed information about a radio transmitter shall be communicated by issuing a Transmitter PDU. The Transmitter PDU shall contain the following fields:

a) PDU Header - This field shall contain data common to all DIS PDUs. The PDU Header shall be represented by the PDU Header Record described in 5.3.24.
b) Entity ID - This field shall identify the entity that is the source of the radio transmission. The source entity may either represent the radio itself or represent an entity (such as a vehicle) which contains the radio. This field shall be represented by an Entity Identifier Record (see 5.3.14).
c) Radio ID - This field shall identify a particular radio within a given entity. Radio ID shall be assigned sequentially to the radios within an entity, starting with Radio ID 1. The combination of Entity ID and Radio ID uniquely identify a radio within a simulation exercise. The Radio ID field shall be represented by a 16-bit unsigned integer.
d) Radio Entity Type - This field shall indicate the type of radio being simulated. This field shall be represented by a Radio Entity Type Record described in 5.3.25.
e) Transmit State - This field shall specify whether a radio is off, powered but not transmitting, or powered and transmitting. This field shall be represented by an 8-bit enumeration. (see Section 9 in EBV-DOC).
f) Input Source - This field shall specify which position (pilot, co-pilot, first officer, gunnery officer, etc.) or data port in the entity utilizing the radio is providing the input audio or data being transmitted. This field shall be represented by an 8-bit enumeration. The values of this enumeration shall be independently specified for each Entity Type (see Section 9 in EBV-DOC).
g) Antenna Location - This field shall specify the location of the radiating portion of the antenna. This field shall be represented by an Antenna Location Record (see 5.3.3).
h) Antenna Pattern Type - This field shall specify the type of representation used for the radiation pattern from the antenna. The value of this field shall determine the interpretation of the Antenna Pattern Parameter field. This field shall be represented by a 16-bit enumeration (see Section 9 in EBV-DOC).
i) Antenna Pattern Length - This field shall specify the length in octets of the Antenna Pattern Parameters field. This length shall include any end padding necessary to assure that the Antenna Pattern Parameter field ends on a 64-bit boundary. Consequently, the value of this field shall be a multiple of 8. This field shall be represented by an 16-bit unsigned integer.
j) Frequency - This field shall specify the center frequency being used by the radio for transmission. This frequency shall be expressed in units of Hertz (Hz). This field shall be represented by a 64-bit unsigned integer.
k) Transmit Frequency Bandwidth - This field shall identify the bandpass of the radio defined by the Radio ID field and the Radio Type field. This field shall be represented by a 32-bit floating point number.
l) Power - This field shall specify the average power being transmitted in units of decibel-milliwatts (dBm). This field shall be represented by a 32-bit floating point number.
m) Modulation Type - This field shall specify the type of modulation used for radio transmission. The modulation type shall be represented by a Modulation Type Record (see 5.3.23).
n) Crypto System - This field shall identify the cryto equipment utilized if such equipment is used with the Transmitter PDU. This field shall be represented by a 16-bit enumeration (see Section 9 in EBV-DOC).
o) Crypto Key ID - This field shall consist of sixteen (16) bits. The high-order bit, when cleared, shall indicate that the crypto equipment is in the baseband encryption mode, and when set shall indicate that the crypto equipment is in the diphase encryption mode. The lower- order 15 bits shall be interpreted as a key identifier. If the key identifier of the transmitter and receiver match, they shall be considered to be using the same encryption key. Note that this key identifier is not an actual crypto key, the nature of which varies among encryption systems and is classified.
p) Length of Modulation Parameters - This field shall specify the length in octets of the modulation parameters that follow this field. This length shall include any end padding necessary to assure that the Modulation Parameter field ends on a 64-bit boundary. Consequently, the value of this field shall be a multiple of 8. This field shall be represented by an 8-bit unsigned integer.
q) Modulation Parameters - This field shall specify modulation type (see 5.4.8.1 (m)) specific characteristics of the radio transmission. The interpretation of this field shall depend on the value of the System field of the Modulation Type record (see 5.3.23). The interpretation of this field for each value of the System field is specified in Section 9 EBV-DOC.
r) Antenna Pattern Parameters - These field shall specify the radiation pattern from the antenna, its orientation in space, and the polarization of the radiation. These fields shall be represented by an Antenna Pattern Parameter Record (see 5.3.4).

The Transmitter PDU is represented in Table 56.

PDU Components:

Item Name Bit Length Opt Opt Ctl Rpt Rpt Ctl
PDU Header Record 96
Entity Identifier Record 48
Radio ID Field 16
Radio Entity Type Record 64
Transmit State field 8
Input Source field 8
Padding - 16bit Field 16
Antenna Location Record 288
Antenna Pattern Type field 16
Antenna Pattern Length field 16
Tranmission Frequency field 64
Transmit Frequency Bandwidth field 32
Power field 32
Modulation Type Record 64
Crypto System field 16
Crypto Key ID field 16
Length of Modulation Parameters(1) Field 8
Padding - 24bit Field 24
Modulation Parameter field 16 Yes Length of Modulation Parameters
Antenna Pattern Parameter Varient 312 Yes Length of Modulation Parameters
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