DIS or Cut Bait: the Push to the First Draft - - PowerPoint PPT Presentation

2020 Simulation Innovation Workshop Orlando, Florida, USA, 10-14 February 2020

2020-SIW-Presentation-036

DIS or Cut Bait: the Push to the First Draft

Robert Murray, SimPhonics, USA

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Background

• The 3rd generation of DIS PDUs is being developed

▪ Will result in DIS Version 8

• Work started in earnest in late 2016

▪ A lot has been done in 3 years ▪ The design of most PDUs has matured ▪ Rules and explanations have been updated

• Work is progressing in the Product Support Group (PSG)
• Can’t create a draft, but can create Problem/Change Requests (PCRs)
• Need to form a Product Development Group (PDG) to create a draft

▪ That starts the 4-year IEEE deadline, so don’t want to do it prematurely

• SIW Paper 18W-SIW-028 has a general overview of what’s changing

Fire Detonation Entity State Transmitter Signal Munition Resupply

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Gen 3 Design Features

• Protocol compatibility with future versions
• Translation compatibility for past versions
• Extensibility

▪ Every PDU has an extension record section ▪ Some records will be standardized, users can add custom records

• Consistent and efficient PDU design

▪ Every PDU has a header, a fixed body portion, and extension records ▪ Allows machine readable syntax description (e.g. XML or JSON)

• Standard document organization

▪ Improved descriptions and rules, information for each PDU co-located

• Significant clarification on several topics, including coordinate system

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PCR 277 – Coordinate Systems Clarification

• The World Coordinate System (WCS) used in DIS

is based on Geocentric Coordinates (GCC), aka Earth Centered, Earth Fixed (ECEF)

▪ Earth X, Y, Z axes for position, velocity, acceleration ▪ Euler angles about Earth X, Y, Z axes for orientation

• Provide clarifications

▪ WGS-84 Ellipsoid ▪ No Geoid correction (DTED over ellipsoid) ▪ Diagrams for helping understand elevation ▪ Discussion of conversions between coordinate systems (reference frames)

Ellipsoid

Simulation sea level

Equatorial (XY) plane

Geoid

Real-world sea level Latitude of beach

Z axis

DIS X, Y, Z Terrain modeled above Ellipsoid Real-world X, Y, Z Terrain above Geoid Latitude of mountain peak Ocean surface Beach Undulation Ocean floor

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Updated Header

• V8 Header Revision

▪ Maintains Protocol Version as first byte ▪ Adds: Compatibility Version, PDU Header Length ▪ Compatibility Version

➢ Indicates the lowest Protocol Version to which this PDU remains compatible

▪ PDU Header Length

➢ Expandable Headers for V9+ enhancements

▪ PDU Type ▪ Built-in Forward Compatibility

Proto Ver Compat Ver Exercise ID PDU Type PDU Status HDR Len PDU Length Timestamp HDR

Field Size (bytes) Field Name Data Type 1 Protocol Version = 8 8-bit enumeration 1 Compatibility Version = 8 8-bit enumeration 1 Exercise ID 8-bit unsigned integer 1 PDU Type 8-bit enumeration 1 PDU Status 8-bit record 1 PDU Header Length = 16 8-bit unsigned integer 2 PDU Length 16-bit unsigned integer 8 Timestamp 64-bit signed integer Total PDU Header record size = 16 bytes

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New PDUs

Three new proposed PDUs

• Application Control PDU

▪ SIMAN PDU to discover and allocate simulation resources to an exercise ▪ Also includes simulation health monitoring

• New Synthetic Environment PDUs for Dynamic Terrain

▪ Scaled Height Map PDU ▪ Soil Attribute Map PDU

• PCRs but have submitted for these PDUs but not been reviewed

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Combine Similar PDUs

• Simulation Management with Reliability combined with the 12
• riginal SIMAN PDUs

▪ Record-R, Set Record-R, and Record Query-R no longer needed ▪ Any extension record can be designed to contain a Record Set

• Entity State Update - no advantage over shortened Entity State PDU
• Collision-Elastic now an extension record for Collision PDU
• Supplemental Emission/Entity State (SEES) now extension records
• Intercom combined with Radio
• Proposal to combine Point Linear, Areal Object State PDUs with

Entity State

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Proposed Deletions

• DIS V8 will eliminate PDUs and features that are not used and have

no proponents

▪ The PDUs and rules in the Version 7 standard can still be used

• Minefield family - Four PDUs with no known users
• Attribute PDU

▪ Every PDU is now extensible, replaces the primary purpose of Attribute PDU ▪ But there could be other purposes

• IsGroupOf PDU
• Non-real-time Protocol

▪ Little or no use, DIS concentrates on LVC, therefore primarily real time

• Live PDUs – Five PDUs with no known users

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Ready for First Draft

The following have PCRs that have been reviewed and are generally ready to go into the first draft, some need minor cleanup

• Entity Information PDUs – Entity State, Collision
• Warfare PDUs – Fire, Detonation, Directed Energy, Damage Status
• Logistics PDUs – All six are ready
• Emission Regeneration PDUs – EE, Designator, Underwater Acoustics

▪ Need IFF

• Entity Management PDUs – Transfer Ownership

▪ Need Aggregate State and IsPartOf

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Ready for First Draft (continued)

• Synthetic Environment – Environmental Process

▪ Need Gridded Data

• Information Operations PDUs – IO Action and IO Report
• Clause 4 General Requirements – DIS Exercise, State PDU, Coordinate

Systems, Time, Data Representation

▪ Proposal for change in Dead Reckoning has not been reviewed

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Needs Some Work

• These are not necessarily complicated, just needs to get done

▪ Not proposing change in capability and usage ▪ But need to convert to DIS V8 format ▪ We have general PDU design figures but don’t have PCRs yet

• SIMAN PDUs
• Aggregate State PDU
• IsPartOf
• Gridded Data PDU

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Needs Significant Work

• IFF

▪ Base PDU is defined, along with Mode 5 and Mode S records ▪ Want to replace the “layer” terminology, but it is pervasive ▪ 100-page annex could be a lot of work

• Communications

▪ Combine Radio and Intercom ▪ Proposed to combine Transmitter, Signal, and Receiver in a single PDU ▪ But a lot of details to work out

• Combine Objects and Entities

▪ Objects use an Environment Manager ▪ Rules need to be merged

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Summary

• The first draft is in sight
• The goal is to stand up a PDG in 2020 and create the first draft
• Three areas requiring significant work before drafting can start

▪ IFF, Communications, Object/Entity combination

• Some work needed on these PDUs

▪ SIMAN, Aggregate State, IsPartOf, Gridded Data

• Some work also needed on the new PDUs

▪ Application Control and Dynamic Terrain PDUs