Preliminary Design Review

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Preliminary Design Review

• Present By

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Team Members
Kevin Nguyen Team Leader
Kitty Kwong Management
Rick Ashley Hardware
Peter Kwong Hardware Testing
Richard Ostrow Software
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Project Requirements

• Basic Prerequisites
• Functional GPS Satellite Network
• Availability of frequencies for transmitting
• Open ground for testing

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Hardware Requirements

• GPS Receiver
• - Capable of outputting raw GPS data
• - Compact
• - Battery powered
• Mobile Transceiver
• - Input for GPS data
• - Compact
• - Battery powered
• - Sufficient power for transmitting over
  several acres
• - Optional intermittent transmission to
  conserve battery life
• Base Transceiver
• - Battery power optional
• - Output to serial computer interface
• Computer
• - Capable of running our software

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Project Tech. Description
GPS Device
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Mobile Unit Block Diagram
Transceiver
GPS Receiver

• Antenna

Battery
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Project Tech. Description

• How does GPS Work?
• The GPS network consists of 24 satellites.
• Each satellite carries several atomic clocks to
  ensure the most accurate time possible.
• Satellite broadcast low-power radio wave
  containing the satellites identity code and
  exact time.
• GPS receiver picks up the signal and compares the
  signal time with its own clock.
• GPS receiver uses the time difference and
  calculates the distance from the satellite.
• Two additional satellites are necessary to narrow
  down the receiver location.
• GPS receiver checks the orbital location of each
  satellite, from this the receiver calculate the
  two dimensional location on earth.
• The fourth satellite pinpoints the receiver exact
  location, the additional information from the
  satellite allow it to calculate its elevation.

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Project Tech. Description
BIM-418F Transceiver Schematic

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Transceiver Specifications

• BIM-418F operating parameters
• Operating temperature ----------- -68 degree F
  to 126 degree F
• Storage temperature--------------- -105 degree F
  to 212 degree F
• Range-------------------------------- 120 M
• Power requirement----------------- 4.5 5.5V
• BIM-418F is capable of transmitting RS-232 serial
  data at half duplex mode at 38.4kbps baud rate
• BIM-418F transmits at 418MHz

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Base Unit Block Diagram
Transceiver
PC
Antenna
Battery (optional)
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GUI Interface Requirements

• Read data from computer serial port
• Convert incoming numbers to grid coordinates
• Store incoming data to a database for future
  retrieval
• - Sample incoming data to cut database size

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Software Design with GPS
Receive coordinate information from
transmitters
Display position on screen
If pre-defined time has elapsed, record
position in the log
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Reliability
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Maintainability
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Technical Risks Solutions

• Interference between the transmitter and the
  receiver
• Signal reflection
• Signal shadowing
• Signal absorption
• Solution
• The problems listed above need further
  investigation and field testing to find an
  optimal solution.
• Interference with animals
• The size and weight of the mobile unit may
  interfere with animal behavior.
• Frequencies being transmitted may interfere with
  animal behavior.
• Solution
• The mobile unit must be designed efficiently and
  as small as possible. Triangulation my be
  considered if GPS unit is too large.
• Live test subjects will be necessary to determine
  adverse effects.
• Ability of the receiver to withstand a harsh
  environment
• Water, heat, and stress will all be factors
  during normal operation of the mobile unit.
• Solution
• Design the mobile unit inside a waterproof
  enclosure, and employ heat reflective material
  inside the unit housing.

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Schedule Status
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Schedule Status Continue
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Labor Status
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The End