Electrical Engineering Department
BS in Electrical Engineering
Direct-sequence spread spectrum (DSSS) is a special modulation technique used in many telecommunication devices which uses a wide bandwidth relative to single-frequency carrier modulation techniques. Like the name suggests, the spectral content of wireless signals are spread across a range of frequencies to increase the security of transmitted signals by reducing the potential impact of outside interference (i.e. noise, jamming). This resistance against outside interference and jamming has particular application in the field of electronic warfare where spread spectrum jamming techniques may prove to be an effective way of shutting down remotely controlled enemy vehicles.
Last year, a group of students at Cal Poly attempted to jam a remotely controlled car that utilized a DSSS communications system. While they were successful in implementing a jammer that blocked the input signals to the RC car, they were constrained by the jammer’s limited range of less than 1 inch between the jammer and the car and they were uncertain of the specific effect the jammer caused on the receiver electronics. This project calls for further investigation into the spread spectrum jammer’s effects on the RC car, in addition to making improvements to the jammer to increase the effective jamming range.