Electronic warfare systems

Abstract

Electronic warfare (EW) is an important capability that can advance desired military, diplomatic, and economic objectives or, conversely, impede undesired ones. In a military application, EW provides the means to counter, in all battle phases, hostile actions that involve the electromagnetic (EM) spectrum-from the beginning when enemy forces are mobilized for an attack, through to the final engagement. EW exploits the EM environment by sensing and analyzing an adversary's application of the spectrum and imposing appropriate countermeasures (CMs) to hostile spectrum use. EW sensors are one means by which the military gathers tactical intelligence from noncooperative forces. EW sensors, together with EW CMs, mitigate the effectiveness of an adversary's electrooptic/infrared, and radio frequency-controlled weapons. EW enhances the survivability of the host force through control and manipulation of the EM environment and denies or limits its use by an adversary. EM spectrum CMs to threat systems can be selectively applied on a time-and/or frequency-multiplexed basis so that host force use of the EM spectrum is uninhibited.

Multi-function radar emitter identification based on stochastic syntax-directed translation schema

“…3,4 Because of various interferences in the complex electromagnetic environment, 5 the radar words, 6 picked up from received emitter pulses by the receiver equipments, always have warps compared with their true values. Therefore, it is of great importance to identify the measured MFR emitters correctly.…”

Radar emitter recognition based on cyclostationary signatures and sequential iterative least-square estimation

“…Conventional recognition approaches, which separate the received pulses into individual emitter group, are usually based on the use of pulse parameters such as direction-of-arrival (DOA), radio frequency (RF), time-of-arrival (TOA), pulse width (PW), pulse repetition interval (PRI), called pulse descriptor word (PDW) (Spezio, 2002). The specific emitter identification (SEI) is a state-of-the-art ELINT signature collection and analysis (Kawalec & Owczarek, 2004;Langley, 1993;Matuszewski, 2008).…”

Wide-Band Chaotic Noise Signal for Velocity Estimation and Imaging of High-Speed Moving Targets

“…In addition, the frequency-hopping code corresponding to the first CCM sequence is [0, 15,12,16,14,10,6,13,2,8,9,7,11,1,5,17,19,18,3,4], while the frequency-hopping code corresponding to the second CCM sequence is [0, 16,1,5,18,7,4,15,6,13,9,11,17,10,3,2,19,8,14,12]. Only the first elements of the two frequency-hopping codes are the same, while the others are completely different.…”

“…Modern radars are facing increasingly complicated electromagnetic environment along with the development of electronic warfare [1,2], so the electronic counter-countermeasures (ECCM) capability, low probability of detection and interception (LPD/LPI) characteristics are becoming important research and development directions for military radars [3,4]. Noise radars have attracted more and more attention owing to their random waveforms, efficient spectrum utilization, good ECCM capability and LPD/LPI characteristics [5][6][7].…”