1. 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.

2. 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

3. 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

4. Puerto Rico Network Site Survey

5. Puerto Rico Network Site Survey

6. Puerto Rico Network Site Survey

7. 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)

8. Radar Design

11. 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

12. 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

14. Internal Calibration Loop Error

15. Magnetron Frequency Drift With Temperature

17. Magnetron Frequency Drift Control Method

19. Questions ?