Abstract
GPS jamming is a considerable threat to applications that rely on GPS position, velocity, and time. Jamming detection is the first step in the mitigation process. The direction of arrival (DOA) estimation of jamming signals is affected by resolution. In the presence of multiple jamming sources whose spatial separation is very narrow, an incorrect number of jammers can be detected. Consequently, mitigation will be affected. The ultimate objective of this research is to enhance GPS receivers’ anti-jamming abilities. This research proposes an enhancement to the anti-jamming detection ability of GPS receivers that are equipped with a uniform linear array (ULA) and uniform circular array (UCA). The proposed array processing method utilizes fast orthogonal search (FOS) to target the accurate detection of the DOA of both single and multiple in-band CW jammers. Its performance is compared to the classical method and MUSIC. GPS signals obtained from a Spirent GSS6700 simulator and CW jamming signals were used. The proposed method produces a threefold advantage, higher accuracy DOA estimates, amplitudes, and a correct number of jammers. Therefore, the anti-jamming process can be significantly improved by limiting the erroneous spatial attenuation of GPS signals arriving from an angle close to the jammer.
Highlights
A GPS signal is at a disadvantage because of its low signal power, which is typically between–125 dBm and –130 dBm at the earth’s surface and is highly susceptible to intentional and non-intentional interferences
Our results showed that the proposed method introduces a significant enhancement to GPS jamming detection and can improve overall system performance
The estimation of signal parameters via rotational invariance technique (ESPRIT) algorithm was proposed by [24]. It is computationally efficient and more robust if compared to MUSIC as it does not search the entire spectrum, but a significant drawback is an incompatibility with all array geometries, as it was designed for uniform linear arrays (ULA)
Summary
A GPS signal is at a disadvantage because of its low signal power, which is typically between. GPS interference mitigation using smart antennas should be capable of detecting multiple interference sources arriving at different DOAs. Conventional beam-forming methods provide DOA estimation for interference sources with limited resolution. Conventional beam-forming methods provide DOA estimation for interference sources with limited resolution This degrades the spatial filtering capability of smart antennas when the jamming signal is closely spaced to the DOA of the GPS signal. High-resolution DOA estimation methods are more suitable for interference mitigation using smart antennas. This paper aims to propose a new high-resolution DOA estimation method of jammers in order to provide smart antennas with the most accurate estimate of the jammers’ DoAs such that beam-steering and null-steering processors nullify the jammer signals without erroneously nullifying parts of the GPS signal, thereby decreasing its effectiveness. Our results showed that the proposed method introduces a significant enhancement to GPS jamming detection and can improve overall system performance
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