ultra wide band fmcw receiver design for airborne applications
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Ultra-Wide Band FMCW Receiver Design for Airborne Applications. By: Jay McDaniel. Scope. Project Description FMCW Review Challenges for Design of Airborne Applications UWB Design Challenges 2-18GHz FMCW Radar Design Integrated Layout Design Need for UWB Radar Questions.

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Presentation Transcript
scope
Scope
  • Project Description
  • FMCW Review
  • Challenges for Design of Airborne Applications
  • UWB Design Challenges
  • 2-18GHz FMCW Radar Design
  • Integrated Layout Design
  • Need for UWB Radar
  • Questions
project description
Project Description

Goals

  • Design and integrated layout of FMCW radar
  • Challenges associated with UWB designs
  • Challenges associated with airborne applications

Deliverables

  • Paper design of a 2-18GHz FMCW radar
  • Integrated layout design ready for fabrication
  • Project Report
frequency modulated continuous wave
Frequency Modulated Continuous Wave
  • T = Repetition Period Bandwidth(B) = f2-f1
  • Chirp Rate(k) = B/T Resolution(δR) = c/(2*B)
  • Beat Frequency(Δf) = (2*R*k)/c c = 3x10^8m/s (free-space)
airborne application design challenges1
Airborne Application Design Challenges
  • Design Considerations
    • Altitude Variations
    • Look Angle Variations
      • Backscatter Coefficient (σo)
      • Range Resolution (ΔR/2sin(θ))
      • Antenna Gain, Pattern
    • Radar Range Equation

Nadir Case

Off-Nadir Case

uwb design challenges
UWB Design Challenges
  • Design Considerations
    • Expensive/Limited Hardware Options
    • Connectorized vs. Surface Mount Components
    • Frequency Dependency
      • Antennas
        • Gain and Pattern variations
      • Amplifiers, Mixer, and Attenuators
        • Gain Variations
          • Gain Equalizer (Active or Passive)
    • Board Layout
      • Technology: Microstrip, Stripline, CPWG
2 18ghz fmcw receiver design1
2-18GHz FMCW Receiver Design
  • Maximum Expected Signal = -53.21dBm
  • Minimum Expected Signal = -73.21dBm
  • Input Saturation Power = -43dBm
  • MDS = -119dBm
  • Receiver Gain ≈ 55dB
  • ADC Dynamic Range is from 10dBm to -66dBm
why uwb
Why UWB?
  • Remember, the range resolution is c/2B. Therefore, the larger the bandwidth the finer resolution you can achieve.
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