Cell phones play an important role in our daily life these days and are an important tool for effective communication. As a result, the number of people using cell phones around the world is increasing rapidly. In most public places such as offices, places of worship, and meeting rooms, cell phones should be turned off for security reasons. Therefore, mobile jammers are most often chosen as they block all signals. Interference wireless mobile devices are used to prevent cell phone signals from sending out a series of electromagnetic pulses in public places (such as offices, churches, conference rooms) to disrupt system communications. Cell phone GPS jammer emit a series of electromagnetic pulses and increase the noise level, thereby disrupting the communication system. If the interference is activated within the effective range, all cell phones will stop working. Signal jammer intentionally block cellular communications through high-frequency operation. Because jammers also interfere with emergency situations and emergency communications, many countries / regions have strict regulations prohibiting the sale, sale, or use of these devices.
The cell phone jammer is a small portable device that can emit destructive interference and overcome weak GPS signals. This article thoroughly analyzes the effects of GPS jammers on GPS and Galileo receivers and recommends adaptive notch filters as effective anti-jamming measures. Signals Generated by Jammers Commercial advertisements are broadcast in large anechoic chambers using GPS and Galileo signals generated by hardware simulators. The analysis is carried out with C / N 0 degradation, with various interference power levels being taken into account. The use of attenuation techniques such as notch filtering can significantly improve the performance of the GNSS receiver even with strong and rapidly changing interfering signals. The Galileo E1 signal contains a pilot tone that can implement pure PLL tracking, making Galileo signal processing less interference.
Originally developed for military applications during the Cold War in the 1960s, GPS technology is now considered an indispensable part of the day-to-day operations of the US Air Force. It relies on multiple applications such as navigation, target tracking, missile and projectile guidance, search and rescue, and reconnaissance. However, with the widespread development of jamming devices designed to jam GPS and other similar systems, these important guidance systems may not be available at a critical time. That seriously hinders the use of airplanes.