Aiming at the laser semi-active guidance jamming technology, this paper expounds the principle of laser semi-active guidance technology and the method of jamming it. Starting from the research of gate technology and pulse acquisition technology, this paper analyzes the jamming effectiveness of current laser jamming technologies such as laser angle deception jamming and high repetition frequency laser jamming against seeker pulse acquisition time gate, and lists the improved laser angle deception jamming and high repetition frequency laser jamming technologies.
Range deception interference on rangefinder is composed of range positive and negative deviation jamming. In this paper, their working principles has been analyzed. And numerous experiments have been conducted to investigate their interference effect on rangefinder. As theoretical analysis and experimental results shows, range positive deviation jamming can accurately control the jamming result. As for range negative deviation jamming, there has a minimum jamming distance related to the jamming laser frequency. The higher the repetition frequency of the jamming laser, the smaller the minimum interference distance related and the larger the effective interference distance range is. And the ranging results under range negative deviation tends to a normal distribution, with the center of the minimum interference distance. No matter which interference mode is chosen, the premise of successful jamming is that the energy of jamming laser is larger than the echo pulse reflected by the target from rangefinder.
This paper summarizes the existing technologies in the field of photoelectric countermeasure, discusses the challenges faced by laser angle deception jamming technology, and comprehensively expounds the development direction of photoelectric countermeasure in the field of laser angle deception jamming. In the field of laser jamming technology, the different ways of laser jamming technology and the development of laser jamming weapons are studied. Through the analysis of the principle of laser semi-active guidance and laser angle deception jamming technology, it is found that the traditional laser guidance technology can be intercepted, copied and finally released by our side for decoying because of the simplicity of its laser coding, but facing the new laser guidance technology and the improved laser coding technology, our laser decoying system will face the risk of failure. Therefore, the future laser angle deception jamming must solve the problem of how to avoid the influence of laser coding technology on laser decoy jamming.
A 1J LD pumped Nd;YAG pulsed laser was designed. The laser uses an oscillation and two-staged amplification structure, and applies diode bar integrated array as side-pump. The TEC temperature control device combing liquid cooling system is organized to control the temperature of the laser system. This study also analyzed the theoretical threshold of working material, the effect of thermal lens and the basic principle of laser amplification. The results showed that the laser system can achieve 1J, 25Hz pulse laser output, and the laser pulse can be output at two width: 6-7ns and 10ns, respectively, and the original beam angle is 1.2mrad. The laser system is characterized by small size, light weight, as well as good stability, which make it being applied in varied fields such as photovoltaic radar platform and etc
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