Improving the Performance of Anti-GPS Signal HESHAM N. ELMAHDY, MOHAMED L. RAMADAN Information technology Department Faculty of Computers and Information - Cairo University 5 Dr. Ahmed Zwail Street, Orman Giza, Postal code 12613. EGYPT ehesham@mailer.eun.eg mohamedloey@gmail.com Abstract: – This paper improves the performance of GPS jamming signal using new technology of jamming. We use new technology called multi-band limit white noise. We identify jamming design issues. 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 this GPS jamming signal using matlab, and jamming controlling system using fuzzy logic. Finally make comparisons between all jamming technologies that use in simulation. Keywords: - Anti-GPS, auto tracker, jamming signal, anti-jamming signal, noise signal, jamming signal ratio(J/S), noise signal ratio (N/S),Multiband-Limited White Noise 1 INTRODUCTION In recent years, GPS has rise as major application in military and civilian devices. The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites. Those satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. This device helps people in many aspects like get location and make mapping also tracking something or someone and get exact time, finally GPS use in navigation. But some of them misuse GPS and use this device to kill, spy and thief anyone. We ask ourselves why people make this to brothers. So jamming radio signal is not a new application ,but it has been use from world war two.GPS jamming [1,2,3] has raise as important application to prevent evil GPS , and how to generate those signal in a laboratory environment. So I write this article to see some advantage and disadvantage of using GPS. How to prevent those evil people misuse of GPS, and generate a simulation to make jamming signal that will block GPS receiver. 1.1 Misuse of GPS “Kill, spy and thief " are easy words that we could say today, by using cheap and small devices and tools to achieve what they want. First of all GPS was originally intended for military applications, to confuse the enemy on where their exact location is. Where are the enemies using GPS guided missiles [4]. GPS allows just anyone to track anyone else, and know where and when, this technology is know as auto tracker [5]. Finally a GPS help thief, what’s happening lately is that the fascists and criminals are finding it much cheaper. So GPS Tracking is an important field in GPS application. We will discuss GPS tracking types. 1.2 GPS Tracking Detecting and Blocking A GPS tracking [5,6,7,8] unit is a device that uses the Global Positioning System to determine the precise location of a vehicle, person, or other asset to which it is attached and to record the position of the asset at regular intervals. We will discuss Types of GPS tracking device technology available to the public. 1.2.1 Passive or Logger Tracking Device Passive tracking is used to tell where a vehicle has been over a certain period of time. Passive tracking devices are so difficult to detect because they use different technologies to report the GPS locations. Probably the best defense against passive/logger tracking devices comes in the form of a GPS blocker. These units can range in price from $200 to $850 [9]. 1.2.2 Real Time or Active Tracking Device Active tracking is intended to show where a vehicle is now, usually real time tracking connect with wireless network using computer or phone to get tracking information. Real type of tracking device is relatively easy to detect with a combination cell phone/GPS blocking device or RF detectors/scanners. These units range in cost from $300 to more than $1000 [9].So the Proceedings of the 8th WSEAS International Conference on Signal Processing ISSN: 1790-5117 17 ISBN: 978-960-474-086-4