Puerto Rico Deployable Radar Network Design; Site Survey and Radar Design

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Puerto Rico Deployable Radar Network Design Site
Survey and Radar Design

• Jorge M.Trabal - M.S. Student
• José G. Colom - Ph.D.
• Sandra L. Cruz - Ph.D.
• Stephen M. Sekelsky - Ph.D.

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Outline

• CASA
• Puerto Rico Network Site Survey
• Radar Design
• - Block Diagram Using a Voltage Controlled
  Oscillator
• - Block Diagram Using a Direct Digital
  Synthesis Source
• - Calibration Loop
• - Magnetron Frequency Drift
• - Radar Budget

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CASA

• CASA - Collaborative Adaptive Sensing of the
  Atmosphere
• Sample the lower atmosphere to precisely predict
  extreme weather events
• To observe, anticipate, and act quickly before
  damage occurs
• Distributed, collaborative and adaptive Systems

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Puerto Rico Network Site Survey
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Puerto Rico Network Site Survey
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Puerto Rico Network Site Survey
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Network Design Drawbacks

• Site accessibility
• High antenna tilt angles to get an obstacle-free
  view
• Higher mountains height is over 1 Km (maximum
  desirable height of study)

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Radar Design
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VCO vs. DDS

• Voltage Controlled Oscillator
• - Controlled by a variable voltage source
• - Need of a digital to analog converter
• Direct Digital Synthesis
• - Reprogrammable to each center frequency
• - Digital input

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Internal Calibration

• Conducts the transmitted pulse to the receiver in
  order to calibrate the receiver and to measure
  the transmitted phase.
• Continuous monitoring of transmit power and
  receiver gain
• Worst error produced when the leakage signal is
  out of phase with the calibration loop signal

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Internal Calibration Loop Error
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Magnetron Frequency Drift With Temperature
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Magnetron Frequency Drift Control Method
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Questions
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