en 5-Satellite Communications Satellite Communications Research Paper Research Paper <div style="text-align: justify;"><span style="font-size:12px;"><span style="font-family:tahoma;"><span class="headingsandsub-headingsChar"><span style="color: black;">The vulnerability of civil GPS receiver to interference may be intentional or unintentional. Among all types of interference, replay attack intended as the most dangerous intentional one. The signal structure of replay attack is almost the same with the satellite signal. The interference effects can be reduce with the design of an appropriate filter in the receiver. This paper presents two methods based on Finite Impulse Response (FIR) filter in frequency and time domain to mitigate the interference effect on GPS signals. Designed FIR filter protects GPS against the replay attack. The suggested filter is applied in the acquisition of the receiver. The proposed method has been implemented on collected dataset. The results show that the proposed algorithms significantly reduce interference. Also, they improve Position Dilution of Precision (PDOP) parameter. Based on the results, the FIR filter technique in time domain has better performance than the frequency domain.</span></span></span></span></div> FIR Filter,Frequency Domain,GPS,Interference Mitigation,PDOP,Time Domain, 318 328 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-78-21&slc_lang=en&sid=1 Z. Shokhmzan z_shokhmzan@elec.iust.ac.ir 180031947532846005784 180031947532846005784 No Department of Electrical Engineering, Iran University of Science and Technology, Narmak, Tehran 13114-16846, Iran M. R. Mosavi m_mosavi@iust.ac.ir 180031947532846005785 180031947532846005785 Yes Department of Electrical Engineering, Iran University of Science and Technology, Narmak, Tehran 13114-16846, Iran M. Moazedi Ph.D. Student, moazedi@elec.iust.ac.ir 180031947532846005786 180031947532846005786 No Department of Electrical Engineering, Iran University of Science and Technology, Narmak, Tehran 13114-16846, Iran