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Millimeter-Wave Radar (Radio Detection and Ranging) operates in the 30–300 GHz frequency range (wavelengths 1-10 mm), with common bands at 24GHz (1.25cm wavelength), 77 GHz, and 79 GHz.
Principle of Automotive Millimeter-Wave Radar Sensor
Automotive mmWave radar detects environmental objects by emitting and analyzing reflected millimeter-wave signals to calculate relative distance, speed, angle, and motion direction. Key technologies include:
- Doppler Shift: Directly measures speed via frequency changes in reflected signals.
- FMCW (Frequency Modulated Continuous Wave): For distance measurement, combines transmitted and received signals via mixer and ADC/DSP processing to reduce chip computational load.
Applications in Automotive Systems
Millimeter-wave radar is integral to advanced driver-assistance systems (ADAS):
- Forward ACC (Adaptive Cruise Control)
- AEB (Automatic Emergency Braking)
- Blind Spot Detection (BSD)
- Lane Change Assist (LCA)
- Parking Aid
Frequency-Specific Roles:
- 24 GHz: Short-range detection (SRR) for obstacle avoidance.
- 77 GHz: Long-range detection (LRR) for highway scene.
Smart Traffic Management Systems
4D Millimeter-Wave Video Radar enables multi-lane, multi-target tracking with X/Y/Z coordinates and velocity data.
Key features:
- High-Resolution Traffic Flow Analysis: Detects speed, occupancy, lane density, and vehicle classification.
- Integration with HD Cameras: Overlays radar data on video for real-time monitoring.
- Multi-Scene Adaptability:
- Speed Enforcement Radars: Multi-lane speed detection with license plate recognition.
- Electronic Toll Systems: Queue length monitoring and congestion alerts.
- Traffic Police Radars: Detects violations (speeding, lane-cutting) without road sensors.
- Parking Management: Automates parking fee calculation via space-occupancy detection.
Advantages Over Traditional Sensors:
- All-Weather Performance: Penetrates fog, rain, and dust.
- Compact Design: Complements cameras, LiDAR, and ultrasonic sensors.
- Low Maintenance: Non-contact measurement reduces wear-and-tear.
Case Studies
- Intelligent Intersection Optimization:
- Analyzes queue lengths and vehicle trajectories to optimize traffic light timing.
- Dynamic Lane Occupancy Monitoring:
- Provides 99%+ accuracy for real-time traffic flow analysis.
- Electronic Police Enforcement:
- Replaces inductive loops with mmWave radar for reliable violation detection.
Key Differentiators
- World-Class 4D Tracking: Simultaneous spatial and temporal resolution.
- Multi-Target Processing: Handles up to 128 targets per radar.
- IP67 Housing: Ruggedized for outdoor deployment.
For detailed technical specifications and deployment solutions, contact our team.
