Portable IDS Design Issues and Tradeoffs

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Portable IDS Design Issues and Tradeoffs
Lee Alexander Intelligent Vehicles Lab University
of Minnesota
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Overview

• Portable IDS - Features and Constraints
• Design Options
• One Proposed Design

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Portable System Functionality

• Mainline Sensors
• Radar
• Provide range, range rate, lane of travel, time
  to intersection for all vehicle within region of
  interest
• Minor Road Sensors
• Lidar based vehicle classification
• Radar approach tracking
• Crossroads Sensors
• Laser scanners as opposed to cameras

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Leveraging Existing IDS System

• Software Directly Applicable
• Sensor processing
• Data acquisition
• Hardware Directly Applicable
• iDAQ computers
• Main process computers
• Archival Terraserver
• Analysis Tools
• Gap acceptance analysis tools
• Near miss identification

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Portable System Design Constraints

• Safety
• Local Codes and Regulations
• Environmental Concerns (Noise)
• Transportability
• Ease of Installation
• Security
• Theft
• Vandalism

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Significant Design Issues

• Sensor Mounting
• Power distribution
• Data transmission
• Main Controller Cabinet/Workstation location

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Sensor Mounting Options

• DOT Supplied Signposts
• Minimized shipping costs
• Appears permanent, may deter theft/vandals
• Stationary/stable
• Requires commitment/effort from DOT

• U of MN Supplied Tripods
• Increases shipping costs (big,heavy, bulky)
• Less than permanent, may attract thieves
• Depending on ground conditions, stability might
  be an issue

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System Power Options

• Utility company power drop
• Solar cells with battery storage
• Generators running 24/7
• Intermittently running generators battery
  storage

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System Data Transfer

• Wireless
• Eliminates Ethernet cable laying on the ground
• Bandwidth, range, reliability, local
  environmental effects
• Wired
• High reliability
• Cabling, rodents, vandals, cost.

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Laser Crossroad sensors

• Pros
• No need to get up high
• (no expensive, bulky masts, power line issues)
• Lasers are less expensive than IR Cameras
• Lasers are less sensitive to environmental
  conditions
• Less data to store
• Cons/Questions
• Would states allow laser sensors in median?
• Place on breakaway mounts, located close to
  ground
• Possible (but unlikely) obstruction of sight
  lines in median.

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Main Controller Trailer/Cabinet

• Our Trailer vs. rented construction trailer
• Standard office trailer - portable
• Converted shipping container - more secure
• Equipment
• Office equipment
• Data acquisition computers
• 19 rack for electronic equipment
• Power source

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Security - Support

• Security
• Remote sensors
• 3 U channel looks official, secure
• Need to have means to secure power source
• (channel pounded into ground)
• Main Trailer
• Locked/checked/armed with an alarm?
• Local DOT Support
• Refueling? Are states willing do to this?
• Status Checks?
• Security Visits?

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Proposed Layout
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Typical Sensor Station
Battery, Charger, Computer, Wireless
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Office Options
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Questions for you

• Local codes?
• Noise restrictions?
• How much help should we plan on from local DOTs?
• Signpost installation
• Security
• Fuel for generators
• Have we missed anything important?