Team 1-B In association with National Weather Service: Radar Operations Center Presents WSR-88D Pedestal Simulator Final Demonstration

Team 1-B Gary Mobley – Configuration Manager Jonathan Moore - Project Manager Brian McCall – Correspondence Officer Usman Chughtai – Financial Officer

Requirements Accurate pedestal response –Achieved Softcopy of firmware –Provided Documentation –Provided Demonstration –Provided

Response Requirements System characteristics for step input: –Slightly underdamped response –Rise time ≤ 1 second –Percent Overshoot ≤ 10% –Settling time (±2%) ≤ 1.5 seconds –Steady state error ≤ 20%

Comm. Requirements Update position every 45 ms Must appear transparent to Open Radar Data Acquisition shelter

Product Description Pedestal Simulator runs on 68HC11 chip Simulates DCU and Pedestal Communicates serially with ORDA

Functional Block Diagram MAIN XMIT CALC ORDA Pedestal Simulator Microprocessor SCIR Serial Port

Key Features Commands Step Response Rate limits Elevation position limits Models pedestal response with second-order approximation

Difference Equation y[n] = y[n-1] (y[n-1] – y[n-2]) (x[n-1] – y[n-1]) wherex[n-1] is DESIRED POSITION y[n-2] is OLD POSITION y[n-1] is CURRENT POSITION y[n] is NEW POSITION Multiplication subroutine built to handle both unsigned and signed multiplication.

Performance Highlights Tr 0.45s Ts 1.31s Overshoot 6.58% SSE 0.2%

Performance Highlights Tr 0.45s Overshoot 6.66% SSE 0.2% Ts 1.31s

Parts Cost ItemUnit PriceQty.Price Microprocessor chip MC68HC711E9CFN2 $ PLCC IC Extractor$3.951 RS-232 Cable 6’ DB9M-DB9F $4.491 Total$18.94

Labor Cost Effective Hourly Rate: $44.7/hr Budgeted Hours for Project Completion 278 hrs Total Budget Cost $12,363 Actual Hours to Complete 231 hrs Total Actual Cost $10,273 Percent Expended 83%

The Schedule

Recommendations Custom PC Board Diagnostics LCD Display –Status –Error Codes

Test Environment Hardware Software

Tests Azimuth –Small/Large Step –+/- Rate –Max/Min Rate –Wrap Around Elevation –Small/Large Step –+/- Rate –Max/Min Rate –Max/Min Position

Demonstration