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This article has proposed the concept of a decoy that could be used against anti-radiation missiles (ARMs). The bait signals are generated remotely and transmitted to the sacrificial antenna site over a fiber-optic network. This network has the possibility to support broadband radar signals in the range of a few GHz. This study postulated a distance of 1 km in relation to its park of antennas, distance that may be greater. This analog fiber link was designed for radar signal transmission in the frequency range of 0.3 to 3 GHz. The theoretical results were compared with the experimental ones, and it was observed that the behavior of the radar signal power gained in the studied range is straight. Thus, the signal does not present distortions. The system proposed in this study is promising as a distraction for ARMs.
Este artigo propôs um estudo breve e teórico para verificar a possibilidade de uso de laços dispersivos com a técnica de auto homodinagem óptica para realizar compressão de pulso linearmente modulado em frequência de radares (linear frequency modulated –LFM). O dispositivo proposto para estudo pretendeu superar as limitações dos dispositivos equivalentes implementados pela eletrônica tal como o filtro baseado em propagação de ondas acústicas de superfície. Essas restrições foram em relação à largura de banda de radiofrequência, frequência da portadora do sinal radar e largura de pulso. Foi feita uma modelagem numérica do dispositivo proposto. Os resultados numéricos indicaram a possibilidade de emprego do compressor de pulso fotônico em radares que estão sendo desenvolvidos com grande produto da largura de banda pela largura do pulso (time bandwidth – TBW).
Cognitive radio frequency (RF) systems can be seen through an OODA (observe, orient, decide and act) loop, and electronic warfare (EW) can be used in some of these stages, namely the observe and the act. Instantaneous microwave frequency measurement (IFM) systems can contribute to cognitive RF technology taking the real world to the data world. In an OODA loop, IFM can be arranged as in the observe stage. Here we have proposed an IFM device that allows the adjustment of the directional couplers coupling coefficients, optical fiber lengths, modulation index and modulation formats, which makes the system tunable. The analytical model result shows good agreement with the simulation, achieving frequency differences of 130 MHz and 210 MHz for the lowest and the highest amplitude comparison function values, respectively.
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