Algorithms for Processing the Information Signal of the Shock Sensor Car Security System

Abstract

Modern car security systems are complex, multiprocessor systems in which the main module interacts with peripheral devices via digital buses. One such device is a microprocessor-based shock sensor. The sensing element of the sensor is usually a MEMS accelerometer. To distinguish between weak and strong impacts on the car body, the sensors have two zones (two levels) of operation. Publications on shock sensors are mainly advertising in nature. This is due to production secrets and unwillingness to disclose signal processing algorithms. The paper presents experimental data on accelerations upon impact on a car body. An information signal processing algorithm is proposed that excludes false alarms and allows the implementation of a digital sensor with 16 adjustable sensitivity gradations and adaptation to periodic disturbing influences.