When we talk of navigation, GPS provides accurate and easy navigation like never before, GPS provides an accuracy that neither of others systems can provide. No matter where on earth you are using a GPS receiver you navigate easily and accurately.

　　GPS jammers were originally developed by the military to mislead enemies about their geographic location and targeting. These devices are then suitable for consumers who want to ensure their privacy or prevent tracking.

　　However, without the proper technical knowledge or in the wrong hands, GPS jammers can potentially disrupt communications by disrupting communications.

　　These days most of our daily routine and critical sectors, like military and aviation industry are highly dependent on GPS navigation.It is shown that jamming can be detected at almost every stage of GPS receiver. The case of intermediate power jamming is emphasized the most, since a GPS receiver is still able to present navigation, which is based upon wrong pseudoranges.