location system (Score 1)

Tracking moving assets like fork lifts is tricky. Specially when you want it down to a foot of accuracy. I've tried with a dead reckoning FOG gyro, indoor gps and rfid. The expensive FOG gyro drifts over time and needs often recalibration (every minute). The indoor GPS has issues with obstacles like walls and shelves. RFID simply only reaches a few inches of rf range. Wherenet.com has an interesting solution, but is very expensive. A better solution is using a mesh network with both RSSI and Ultrasonic Technology. The ultrasonic sensors like Cricket from MIT are easy to setup and provide accuracy in inches. They do have an issue with walls and obstacles, so you want to use RSSI when the ultrasonic sensors are out of range. This combination would provide excellent location and a mesh network to communicate the status of assets back to your server. More details call me at [e-mail]