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National Weather Service ROC WSR-88D

National Weather Service ROC WSR-88D. Radar Pedestal Simulator for Capt. Colin Johnston. Project Problem Statement for The National Weather Service Radar Operations Center Captain Colin M. Johnston.

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National Weather Service ROC WSR-88D

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  1. National Weather ServiceROC WSR-88D Radar Pedestal Simulator for Capt. Colin Johnston

  2. Project Problem StatementforThe National Weather Service Radar Operations Center Captain Colin M. Johnston • The goal of the WSR-88D Capstone Project is to implement a higher order model to more closely simulate actual radar movement, velocity and acceleration and still return data packets to the command module at the required frequency.

  3. Project Compliance • 2nd order simulation of radar movement • Both Elevation and Azimuth • Meets Specifications • Rise Time < 1 second • Settle Time < 2 seconds • Steady State error < 5% • Accommodates physical limitation of radar dish • Maximum speed ± 6 rad/s ≈± 36°/second • Elevation Range -2° to + 60° • Elevation hard stops eventually cause errors

  4. Functional Block Diagram RDA Data Acquisition Computer SCIR Serial Communications Interrupt Routine MAIN Control Loop CALC Calculation Controller PARITY FORMAT R_TO_P Rate Interpreter XMIT Transmission Subroutine SIM Rate and Position Calculations

  5. Simulator Development Steps • 8th order transfer function • 2nd order system • State Space Representation • Position • Speed • Discrete system • Sampling time 45 ms

  6. Simulation Model Structure Rate response • 16-bit • 16-by-16 bit multiplication • Unsigned subtraction + Σ Σ Σ - Tω2 T Input Position Command Position response Current Rate Z-1 Z-1 1-2ξTω

  7. System PerformanceAzimuth Step Response System Response to 22.5 Degree Step Red – PedSim response from Microcontroller Blue – 2nd order model response simulated in MatLab Green – 8th order model response simulated in MatLab

  8. System PerformanceElevation Step Response System Response to 22.5 Degree Step Red – PedSim response from Microcontroller Blue – 2nd order model response simulated in MatLab Green – 8th order model response simulated in MatLab

  9. System PerformanceAzimuth Ramp Response

  10. Expenses

  11. Labor Cost • Actual hours worked – 353.5 • Budget Hours - 312

  12. Labor Cost • Estimated 194 Total Man Hours • Total labor cost - $9490 • For weekly breakdown of hrs worked refer to Table 1- Team 1A Budget

  13. The Test Environment

  14. Simulation EnvironmentIssues • Latency in the Labview VI • Elevation rate command issues

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