چكيده به لاتين
Radar systems are widely used in military and civilian spheres. In electronic warfare condition, the enemy applies many attacks to radar systems and tries to obtain their signal information. Spot jamming where jammer does only on one channel with a specified bandwidth is one type of enemy’s attacks. In this type of jamming when the jammer accesses to structure of radar’s signal then the success of attack is enhanced. To resist against the spot jamming, which is the purpose of this thesis, two important parts (i.e. phase and frequency codes) which are used to compress the pulse in radar systems should be confidential. The cipher blocks can generate confidential outputs. In this thesis, we want to use these outputs as phase and frequency codes and quadru-phase codes instead of binary-phase codes to achieve the purpose of this thesis. Furthermore, probability of false alarm, autocorrelation function and integrated side-lobes ratio has been investigated by mathematical equations and simulation verifications.
Keywords: Radar, SPOT Jamming, Pulse Compression, Phase Codes, Quadru-Phase Codes, Frequency Codes, Block Ciphers
