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

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Team 1 b

Team 1-B In association withNational Weather Service: Radar Operations CenterPresentsWSR-88D Pedestal Simulator Final Demonstration


Team 1 b

Team 1-B

Gary Mobley – Configuration Manager

Brian McCall – Correspondence Officer

Usman Chughtai – Financial Officer

Jonathan Moore - Project Manager


Requirements

Requirements

  • Accurate pedestal response

    • Achieved

  • Softcopy of firmware

    • Provided

  • Documentation

    • Provided

  • Demonstration

    • Provided


Response requirements

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

Comm. Requirements

  • Update position every 45 ms

  • Must appear transparent to Open Radar Data Acquisition shelter


Product description

Product Description

  • Pedestal Simulator runs on 68HC11 chip

  • Simulates DCU and Pedestal

  • Communicates serially with ORDA


Functional block diagram

Functional Block Diagram

Pedestal Simulator

Microprocessor

CALC

SCIR

Serial Port

MAIN

XMIT

ORDA


Key features

Key Features

  • Commands

  • Step Response

  • Rate limits

  • Elevation position limits

  • Models pedestal response with second-order approximation


Difference equation

Difference Equation

wherex[n-1] is DESIRED POSITION

y[n-2] is OLD POSITION

y[n-1] is CURRENT POSITION

y[n] is NEW POSITION

y[n] = y[n-1] + 0.7634 (y[n-1] – y[n-2]) + 0.037 (x[n-1] – y[n-1])

  • Multiplication subroutine built to handle both unsigned and signed multiplication.


Performance highlights

Performance Highlights

Overshoot

6.58%

SSE

0.2%

Ts 1.31s

Tr 0.45s


Performance highlights1

Performance Highlights

SSE

0.2%

Overshoot

6.66%

Ts 1.31s

Tr 0.45s


Parts cost

Parts Cost


Labor cost

Labor Cost


Team 1 b

The Schedule


Recommendations

Recommendations

  • Custom PC Board

  • Diagnostics

  • LCD Display

    • Status

    • Error Codes


Test environment

Test Environment

Software

Hardware


Tests

Tests

  • Azimuth

    • Small/Large Step

    • +/- Rate

    • Max/Min Rate

    • Wrap Around

  • Elevation

    • Small/Large Step

    • +/- Rate

    • Max/Min Rate

    • Max/Min Position


Demonstration

Demonstration


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