Abstract
This paper describes an application of magnetic sensor for vehicle detection. A vehicle is detected by earth magnetic field anomaly. It requires enough sensitivity and stability in milligauss. We apply a proprietary magnetoresistive device that has a lot of improvement compare with conventional sensors. The experimental results show good sensitivity, stability, and advantages to conventional method. Sensor out put shows good repeatability for the same object though each object generates different magnetic signature by each magnetization. It enables to detect the velocity with calculating auto correlation. This method is independent of the distance from objects up to 1-2 feet. This enables easy and wide variety way of installations to the sensor.
