Threats

Threats

Threats are managed across multiple GVA HMI displays — the DEF radar, the SA PPI overlay, and the LSAS camera strip. All threat displays share the same DDS data source and update simultaneously.

Threat Displays

Radar View (DEF Screen)

The DEF screen features a top-down radar view centred on the vehicle. Threats appear as colour-coded diamond markers positioned by bearing and range:

Radar View Radar Zoom
Radar Radar Zoom

Press F2 on the DEF screen to toggle between standard and zoomed views.

Threat Table

The tabular view lists all tracked battlespace objects with their hostility classification, bearing, range, and last update time:

Threat Table

PPI Overlay (SA Screen)

The SA screen PPI widget overlays threat contacts on top of the camera feed. Several PPI styles support threat display:

  • Style 3 — Tactical display with threats
  • Simple with Threats — Simplified threat display
  • Classic with Threats — Classic style with threat contacts
  • Modern with Threats — Modern style with threat contacts

See the PPI page for all available styles.

LSAS Strip Integration

The LSAS (Local Situational Awareness System) strip shows six live camera thumbnails in a horizontally scrollable view with a 360° direction bar. When threats are present, diamond-shaped indicators are overlaid directly onto the camera thumbnails at the corresponding bearing. This provides immediate visual correlation between camera feeds and detected threats:

  • Threat diamonds are positioned vertically by range (closer = lower, further = higher)
  • Colour coding matches the radar view hostility scheme
  • Labels show threat identifiers (e.g. "H1", "S2") and range in metres
  • Indicators update in real time as threats move

The LSAS strip is toggled with F6 on the SA screen and supports day/night mode switching via F5.

Hostility Classification

Threats are classified by hostility using colour-coded indicators consistent across all displays:

Classification Colour Description
Hostile Red Confirmed enemy
Suspect Orange Probable enemy
Unknown Yellow Not yet classified
Neutral Green Non-combatant
Friendly Blue Allied forces
Pending White Awaiting classification

Threat Lifecycle

Threats follow a DDS-driven lifecycle using the Battlespace Objects topics defined in DEF STAN 23-009 LDM:

stateDiagram-v2 [*] --> Detected : C_Battlespace_Object received Detected --> Tracking : C_Object_Location updates Tracking --> Tracking : Location / hostility updated Tracking --> Reclassified : Hostility changed Reclassified --> Tracking : Continue tracking Tracking --> Removed : C_Battlespace_Object_CP_objectDeleted Removed --> [*]

Lifecycle Stages

Stage DDS Topic Description
Detection C_Battlespace_Object New object received with hostility classification
Tracking C_Object_Location Continuous position updates; bearing and range calculated from vehicle position
Reclassification C_Battlespace_Object Hostility updated (e.g. Unknown → Hostile)
Removal C_Battlespace_Object_CP_objectDeleted Object removed from all displays

ThreatManager

The ThreatManager class maintains the threat track table. It subscribes to the DDS Battlespace Objects topics and provides the threat data to all display widgets. Key responsibilities:

  • Receiving and parsing C_Battlespace_Object messages
  • Calculating relative bearing and range from vehicle position
  • Maintaining the track table with latest position and hostility
  • Notifying display widgets of updates
  • Removing stale or deleted tracks

All threat displays — PPI overlay, DEF radar, threat table, and LSAS strip diamonds — update simultaneously from the same ThreatManager data source.

  • DEF — Defence screen with radar and threat table
  • SA — Situational Awareness with PPI overlay
  • PPI Widget — Radar overlay styles including threat variants
  • Alarms — Alarm notifications for threat-related events