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• class Transponder extends Thread {

Position currentPosition ; Coords c1, c2 ; Satellite sat1, sat2 ; Navigator theNavigator ; public Position givePosition () { return currentPosition ; } public void run () { while (true) { c1 = sat1.position () ; c2 = sat2.position () ; currentPosition = theNavigator.compute (c1, c2) ; } } } //Transponder

• A weather data collection system is required to generate

weather maps on a regular basis using data collected from remote, unattended weather stations and other data sources such as weather observers, balloons and satellites. Weather stations transmit their data to the area computer in response to a request from that machine. The area computer validates the collected data and integrates it with the data from different sources. The integrated data is archived and, using data from this archive and a digitized map database a set of local weather maps is created. Maps may be printed for distribution on a special-purpose map printer or may be displayed in a number of different formats.

• A weather station is a package of software controlled

instruments which collects data, performs some data processing and transmits this data for further processing. The instruments include air and ground thermometers, an anemometer, a wind vane, a barometer and a rain gauge. Data is collected every five minutes. When a command is issued to transmit the weather data, the weather station processes and summarizes the collected data. The summarized data is transmitted to the mapping computer when a request is received.

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• System

– Weather station

• Use-case

– Report

• Actors

– Weather data collection system, Weather station

• Data

– The weather station sends a summary of the weather data that has been collected from the instruments in the collection period to the weather data collection system. The data sent are the maximum minimum and average ground and air temperatures, the maximum, minimum and average air pressures, the maximum, minimum and average wind speeds, the total rainfall and the wind direction as sampled at 5 minute intervals.

• Stimulus

– The weather data collection system establishes a modem link with the weather station and requests transmission of the data.

• Response

– The summarized data is sent to the weather data collection system

• Comments

– Weather stations are usually asked to report once per hour but this frequency may differ from one station to the other and may be modified in future.

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• interface WeatherStation {

public void WeatherStation () ; public void startup () ; public void startup (Instrument i) ; public void shutdown () ; public void shutdown (Instrument i) ; public void reportWeather ( ) ; public void test () ; public void test ( Instrument i ) ; public void calibrate ( Instrument i) ; public int getID () ; } //WeatherStation

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