Civil Defense Broadcasting System

Civil Defense Broadcasting System

(A critical communication facility for wartime air defense and peacetime emergency response, with the following core functions and construction essentials:)

I. System Composition & Functions

Core Equipment

• Broadcast Console: Supports manual/auto switching, receives air raid alerts, and controls broadcast content.

• Speaker Network: Covers key urban areas (e.g., bomb shelters, evacuation zones) using IP speakers, waterproof horns, etc., ensuring clear audio.

• Smart Terminals: Enable real-time voice capture, remote control, and some integrate GPS positioning.

Core Functions

• Wartime Air Defense: Automatically broadcasts evacuation orders upon air raid alerts (multi-language support).

• Daily Emergency: Issues disaster warnings (floods, fires), policy announcements, and epidemic alerts.

• Dual-Purpose Use: Integrates with fire alarms, auto-switching to emergency mode during disasters.

II. System Architecture

Hierarchical Network Structure

• City-Level Platform: Centralized management, interfaces with provincial systems.

• County-Level Platform: Covers towns/villages, enabling three-tier coordination.

• Terminal Devices: IP speakers, active audio units, supporting cross-network access.

Key Technologies

• Data Encryption: Prevents malicious tampering, ensuring information security.

• Smart Zoning: Targeted broadcasts by region/risk level to minimize interference.

• Multi-Device Compatibility: Works with smartphones, vehicle terminals, etc.

III. Construction Standards

Site Selection

• Priority to high-traffic, densely populated areas (parks, squares), ensuring ≥2 km coverage.

• Integrated with fire exits and emergency shelters for dual-purpose use.

Installation

• Cabling: Flame-retardant cables, isolated from power lines to reduce interference.

• Speaker Placement: Optimized spacing (≤25m in walkways) for sound field coverage.

• Testing: Complies with Civil Air Defense Shelter Design Codes for response time/audio quality.

Maintenance

• Quarterly drills to test system linkage and update evacuation plans.

• Remote cloud monitoring for real-time diagnostics.

IV. Case Study: Pengxi County Integration

• Results: Unified civil defense alerts and emergency broadcasts, achieving 100% county-town-village coverage.

• Tech: Data encryption + tiered authorization to prevent leaks.

V. Future Trends

• AI Integration: Speech synthesis for multilingual alerts, GIS-based dynamic routing.

• Multi-System Synergy: Links with surveillance/access control for "broadcast + monitoring" synergy.

Recommended Solution: IP-based network architecture (scalable + secure).
Implementation: Needs analysis → System design → Deployment → Testing → Training/Maintenance.

(Note: Aligns with national civil defense standards while adapting to smart city developments.)