National Weather Service ROC WSR-88D Radar Pedestal Simulator for Capt. Colin Johnston Group 1A Patrick Macklin-Project Manager Jeff Myers-Financial Officer Osama Alkhouli-Configuration Manager Ryan Jones-Correspondent

Project Problem Statement for The 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.

Project Compliance 2 nd 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

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

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

Simulation Model Structure 16-bit 16-by-16 bit multiplication Unsigned subtraction T Tω2Tω2 1-2ξTω Rate response Position response + - Input Position Command Z -1 Σ ΣΣ Current Rate

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

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

System Performance Azimuth Ramp Response

Expenses BudgetedActual Processor$200$73.50 PLCC IC Extractors $30.00 $3.95 DB9M-DB9F$4.49 Shipping$20.00$31.95 Total$250$113.89

Labor Cost Actual hours worked – Budget Hours - 312

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

The Test Environment

Simulation Environment Issues Latency in the Labview VI Elevation rate command issues