Nonstationary jammer excision has been the subject of interest for anti-jam GPS receivers for many years. A large class of “smart” jammers assumes frequency modulated (FM) waveforms that are characterized by their instantaneous frequencies (IFs). Several anti-jam techniques rely on the instantaneously narrowband signal characteristic and use joint-variable signal representations to reveal the j...

Conventional jammer location equipment consists of dedicated electronic intelligence (ELINT) equipment installed in an aircraft pod. This is effective against small numbers of high power jammers but is less effective when the threat is large numbers of low power, low cost jammers. The low power of GPS satellite signals makes it particularly susceptible to jamming or interference. NAVSYS has sol...

BACKGROUND Substantial evidence indicates that exposure to electromagnetic fields (EMF) above certain levels can affect human health through triggering some biological responses. According to WHO, short-term exposure to EMF at the levels present in the home/environment do not cause any apparent detrimental effects in healthy individuals. However, now, there is a debate on whether long-term expo...

Unmanned aerial vehicles (UAVs) can be integrated into wireless sensor networks (WSNs) for smart city applications in several ways. Among them, a UAV employed as relay "store-carry and forward" fashion by uploading data from ground sensors metering devices and, then, downloading it to central unit. However, both the phases prone potential threats attacks. As legacy traditional networks, jamming...

Consider a scenario where a sophisticated jammer jams an area in which a single-channel random access based wireless sensor network operates. The jammer controls the probability of jamming and the transmission range in order to cause maximal damage to the network in terms of corrupted communication links. The jammer action ceases when it is detected by the network and a notification message is ...

Abstract—Traditional space-time adaptive processing (STAP) algorithm not only have a big computation, but also cannot suppress the multiple narrowband jammer and the narrowband jammer which come from the same direction with the useful signal. Focus on these problems, an improved GPS anti-jam multistage nested Wiener filter (MSNWF) method which combines with multistage IIR lattice notch filter w...

Communication abilities of a wireless network decrease significantly in the presence of a jammer. This paper presents a reactive technique, to detect and locate the position of a jammer using a distributed collection of wireless sensor devices. We employ the theory of autonomic computing as a framework to design the same. Upon detection of a jammer, the affected nodes self-configure their power...

A null steering GPS antenna array is designed in this paper. In the proposed method, the exact full wave antenna radiation properties with the effect of mutual couplings and nearby scatterers are considered to calculate the array steering vector, precisely. Although the proposed method is not constrained by the array geometry and the antenna element specifications, a five patch antenna elements...