California Department of Transportation
 

Sensors Research and Evaluation
Hardware

The hardware consists of four parts which can be deployed independently or in combination: a portable 30-foot tower, a wireless pan-tilt-zoom camera, a Sidefire radar detector, and an interface to read loop data from 222 detector cards. Due to fiscal constraints, the components are very inexpensive, which should allow the system to be more widely deployable.

The tower consists basically of 5-foot TV antenna pole sections on a plywood base. This is self-standing, but over 10-foot it should be tethered. It can be tethered to anything, but if there is nothing else available, we use 5 gallon buckets of water. These can be filled on the way to the site, capped with lids, and then pored out and stacked when done. This allows storage of the tower in any office environment, and for it to be moved and setup by one person with just a passenger vehicle. The total cost for the tower, buckets and tie-downs is about $100.

An RTMS Sidefire Radar unit can be placed on the PT head. This is mounted with a coaxial camera with a field of view slightly larger than the Radar for use in setup and "ground truth" modes. We have separately developed our own RTMS driver and setup software that is significantly faster and easier than that provided by EIS (the manufacturer). The accuracy and functionality of Sidefire radar is very much a function of both its setup position and settings , and this configuration allows these to be quickly optimized.

The final bit of hardware allows extracts the loop data directly from the model 222 cards that are hooked up to the model 170 controller. This can be done in 2 ways. As originally configured, the "Log 170" program can be installed in the model 170 and the data is read out its serial port. This configuration works, but requires the model 170's serial ports to be reconfigured and for the model 170 be taken offline from the TMC during the evaluation period. An alternate method (still being developed) is to plug a "T" cable in the C1 connector between the model 170 and model 222 cards, which allows the model 170 to stay online with the TMC as loop as a separate microcontroller simultaneously reads the model 222 data. It is expected that this second option will be generally preferable.

Mounting System QuickTime Animation(Requires QuickTime 6 Player)

System with mounting base

System with mounting base

Complete system ready for transport

Complete system ready for transport

Electronics in carry case

Electronics in carry case

Tower set up with camera

Tower set up with camera