In recent years, GPS has rise as major application in military and civilian devices. GPS is not a new technology, but GPS has been misused in killing, spying, and thieving.This book identifies issues related to implementing a GPS jamming signal. Those issues pertain to jamming accuracy requirements, as well as important jamming system design parameters. How those issues may affect jamming system performance. It addresses fabrication issues, data requirements, error handling, local and remote operations, how to attain high accuracy, and repeatability during the generation and measurement of jamming. We simulate GPS Jamming signal using Matlab. We make comparisons between all jamming technologies that use in simulation.