Automotive Radar Millimeter-Wave Technology
   

Automotive Radar Millimeter-Wave Technology


Beyond passive safety systems, active safety systems play a major role in reducing traffic fatalities. Active safety systems include adaptive cruise control and collision warning systems with automatic steering and braking intervention.

In a collision warning system, a 77 GHz transmitter emits signals reflected from objects ahead, at the side and to the rear of the vehicle and are captured by multiple receivers integrated throughout the vehicle. The radar system can detect and track objects in the frequency domain triggering a driver warning of an imminent collision and initiate electronic stability control intervention.

Millimeter-Wave Technology

Advancements in SiGe:C HBT technology pushed the emerging arena of high-frequency (>60 GHz) millimeter-wave (mm-wave) applications such as WLAN (60 GHz) and automotive radar (77 GHz) circuits into the reach of low-cost silicon technology.

Freescale's expertise in SiGe:C bipolar development has been leveraged to provide a mm-wave-capable variation of the 180 nm SiGe:C BiCMOS platform. Announced in 2006, this technology features bipolar transistors with a 300 GHz maximum oscillation frequency and active and passive models optimized for mm-wave applications.

Freescale 77 GHz Technology Advantages

Multi-mode, multi-application capability

  • Simultaneous long- and mid-range functionality
    • Allows one radar to be used for multiple safety systems:
      • Adaptive cruise control
      • Headway alert
      • Collision warning
      • Mitigation and brake support

Freescale 77 GHz Technology Advantages Cont.

Solid-state technology

  • Highest level integration
    • Most advanced SiGe technology with multi-channel transmitter and receiver chips
  • No moving parts
  • Extremely reliable

Class-leading performance and durability

  • Resistant to vibration and extremely robust
  • Innovative design provides excellent multi-target discrimination
    • Including precise range, approach speed and angle data
  • High speed FMCW waveform combined with 2D-FFT algorithm
    • Provides independent measurements of range and range rate
    • Provides superior detection of clustered stationary objects

Automotive Radar Applications

Application Detection Range Safety Aspect Technology
Adaptive Cruise Control 200 meters Normal driving; accident avoidance 77 GHz Radar
Pre-Crash 30 meters Accident; mitigation of impact 77 GHz Radar / 24 GHz Radar 76 / 81 GHz Radar
Blind Spot Detection 20 meters Normal driving; accident avoidance 24 GHz Radar/ Vision sensor
Lane Departure Warning 60 meters Normal driving; accident avoidance Vision sensor
Stop and Go 30 meters Normal driving; accident avoidance 77 GHz + 24 GHz Radar 76/81 GHz Radar

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