Solution Background & Requirements

Municipal sanitation faces increasing demands for intelligent transformation. A coastal city plans to deploy autonomous sweeper fleets with the following core requirements:

1. 24/7 Operation: Must withstand tidal high-salt fog (Cl⁻ concentration >20mg/m³)
2. Complex Environment Adaptation: Coverage of hardened roads (85%), green belt edges (10%), and building drainage channels (5%)
3. Network Resilience:
   • Single-device daily traffic: 85GB (HD video + sensor data)
   • End-to-end latency for control commands: <50ms

System Architecture

Hardware Layer

Network Topology

1. Primary Link: 5G SA (N77/N78 bands)
   • Video stream: H.265 encoded, bridge-mode direct edge-cloud transfer (30% bandwidth reduction)
   • Control commands: MQTT over VPN tunnel (QoS Level 2)
2. Redundant Link: Wi-Fi 6 Mesh (1774Mbps theoretical speed)
   • SV900 dynamic routing for AP switching
3. Fallback Link: Local RS485 terminal (offline path planning)

SV900 Core Functional Scenarios

Case 1: Salt-Fog Resilience

• Hardware Protection: M12 connectors (IP40) prevent SIM contact corrosion
• Protocol Optimization: Dual-SIM auto-switching (threshold: -94dBm)
• Performance Data:
  MetricConventional 4GSV900 SolutionNetwork Recovery18 sec≤2 secMonthly Reconnects6.70.3

Case 2: High-Density Operation

Peak network load per sweeper:

• Throughput: 42Mbps (3x1080P video + LiDAR point cloud)
• Traffic Prioritization:
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  1. Brake commands → Primary 5G (highest priority)  
  2. Positioning data → Secondary 5G (medium priority)  
  3. Logs → Wi-Fi 6 local cache (off-peak uploads)  
  

Result: Emergency stop response reduced from 320ms to 89ms.

Case 3: Multi-Vehicle Coordination

In narrow passages (<2.5m width):

1. CAN interface collects inter-vehicle distance (10Hz refresh)
2. 5G LAN enables direct vehicle-to-vehicle communication
3. Dynamic queue adjustment (average latency: 47ms)

Fault Diagnosis & Recovery

Workflow Example

Symptom: Frequent “navigation signal anomaly” alerts.
Diagnosis:

1. GPS coordinates deviated by 3.2km
2. RS485 analyzer detected 1575.42MHz interference
3. Gyro data validation ruled out hardware failure
   Solution:

• Enable GPS/BeiDou dual-mode
• Apply Kalman filtering for coordinate correction

Three-Level Fault Recovery

Economic Analysis

Cost Comparison

Lifecycle Savings

• Per vehicle over 8 years:
  RMB 459,000 total (maintenance + data + downtime savings)

Technical Roadmap

1. Edge Computing Upgrade: Deploy local AI waste detection via SV900’s AGX Orin platform
2. Protocol Expansion: CAN-FD interface for next-gen chassis (4x throughput)
3. Energy Optimization: SOC-based dynamic power adjustment (350mA→290mA@12V)

Certification & Compliance

Passed MIIT’s Smart Municipal Equipment Standards:

1. 98.6% uptime in simulated typhoons (25m/s winds, 35mg/m³ Cl⁻)
2. 18h non-stop operation capability (4.7-ton daily capacity)
3. 0.003% annual command loss rate (industrial-grade reliability)