Goal Troll

1
Goal Troll
Alan Gerber Evan Tobac James
Forbes Cem Onyuksel
2
Concept and Motivation
This project will allow for NHL officials to
determine if a puck crosses the goal line with
better accuracy than the existing tools. The
prototype uses embedded components such as ultra
wide-band transmitters and receivers in both the
puck and around the net, as well as a light and
buzzer that will go off when the puck crosses the
line.
Goal???
Goal???
3
Competitive Analysis

• Hawkeye British visual ball-tracker
• - triangulation using visual images from multiple
  cameras
• - used in tennis, tested in British Premier
  League
• Problems in systems like this for goal-oriented
  team sports
• "You cannot ensure it works when there are a
  bunch of players inside the goalmouth and you
  cannot see the ball, or when there is poor
  visibility."

Cairos German soccer ball tracker - RF
transmitters" in shinguards ball - measures at
2000 Hz - also uses magnetic field for accuracy
around goals - tested in 2007 World Cup -
interference problems "had failed in one of
seven trial matches during the World Club
Championships in Tokyo in December because of
interference on the signal being sent to the
referee's watch device."
4
Requirements

• Functional Requirements
• - Transmitter mounted in the hockey puck
• - Multiple receives mounted in and around the
  goal
• - Detect anytime the hockey puck crosses into the
  goal (a goal is scored)
• - Not trigger if a goal is not scored.
• - Transmits ultra-wide band signals from puck
• - Receivers calculate distance to the puck
• - Multiple receivers triangulate position of the
  puck to determine if a goal is scored
• Energy Requirement
• - The puck shall have enough power to last
  through an entire hockey game.
• Performance Requirement
• - The puck's location must be calculated to
  within one inch
• Reliability Requirement
• - The puck and goal system must be durable enough
  to not break during hockey games

5
Technical Requirements
Use Ultra Wide Band radio frequency protocol
(3-10GHz)