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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Ultra-Wide Band FMCW Receiver Design for Airborne Applications

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Ultra wide band fmcw receiver design for airborne applications

Ultra-Wide Band FMCW Receiver Design for Airborne Applications

By: Jay McDaniel


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 PeriodBandwidth(B) = f2-f1

  • Chirp Rate(k) = B/TResolution(δR) = c/(2*B)

  • Beat Frequency(Δf) = (2*R*k)/cc = 3x10^8m/s (free-space)


Airborne application design challenges

Airborne Application Design Challenges


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 design

2-18GHz FMCW Receiver Design


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


Integrated layout design

Integrated Layout Design


Integrated layout design1

Integrated Layout Design


Integrated layout design2

Integrated Layout Design


Why uwb

Why UWB?

  • Remember, the range resolution is c/2B. Therefore, the larger the bandwidth the finer resolution you can achieve.


Questions

Questions???


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