Portable IDS Design Issues and Tradeoffs

Lee AlexanderIntelligent Vehicles LabUniversity of Minnesota

Overview

Portable IDS - Features and Constraints

Design Options

One Proposed Design

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

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

Portable System Design Constraints

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

Theft Vandalism

Significant Design Issues

Sensor Mounting

Power distribution

Data transmission

Main Controller Cabinet/Workstation location

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

System Power Options

Utility company power drop

Solar cells with battery storage

Generators running 24/7

Intermittently running generators + battery storage

System Data Transfer

Wireless Eliminates Ethernet cable laying on the ground Bandwidth, range, reliability, local environmental

effects

Wired High reliability Cabling, rodents, vandals, cost.

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.

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

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?

Proposed Layout

Typical Sensor Station

Battery,Charger,

Computer,Wireless

Office Options

Questions for you

Local codes? Noise restrictions? How much help should we plan on from local

DOT’s? Signpost installation Security Fuel for generators

Have we missed anything important?