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[ Instrument R&D of Instrumentation Network ] Recently, the Key Laboratory of Quantum Optics of the Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences studied the influence of background light, modulation depth and modulation duration of the laser-related imaging quality of chirped amplitude heterodyne detection by experiment It is proved that under the condition of -30dB irradiation signal-to-noise ratio, chirped amplitude modulation heterodyne detection laser-related imaging system can still obtain high-quality images. In addition, both high modulation depth and long modulation duration are beneficial for heterodyne correlation imaging quality.
As a new imaging radar system, laser correlation imaging radar has attracted wide attention. Scientists have proposed narrow pulse laser correlation imaging radar, heterodyne detection laser correlation imaging radar and coherent detection laser correlation imaging radar. At present, the research on narrow pulse laser correlation imaging radar is more and more mature; in order to improve the anti-jamming capability and comprehensive performance of the system, in recent years, the theory and numerical simulation research on heterodyne detection laser correlation imaging radar and coherent detection laser correlation imaging radar have been carried out However, there has been a lack of experimental verification.
The research team built an experimental system of chirped amplitude-modulated heterodyne detection laser correlation imaging radar, analyzed the statistical characteristics of background light in real scenes, and built a set of experimental systems based on chirped amplitude-modulated heterodyne detection laser correlation imaging radar. A background light simulation experiment system that is consistent with practical applications and is used to quantitatively test and verify the influence of background light on the imaging quality of radar systems. For narrow-pulse laser correlation imaging radar, in order to obtain better imaging quality, the intensity of the echo signal is often required to be much stronger than the background intensity. The research team gave the theoretical relationship between the radiation signal-to-noise ratio, the modulation depth of the light source and the modulation duration and the chirp amplitude modulation heterodyne detection laser correlation imaging radar imaging signal-to-noise ratio, and experimentally proved the chirp amplitude modulation heterodyne detection laser correlation imaging The radar can obtain high-quality images under the condition of -30dB irradiation signal-to-noise ratio, which proves that the imaging technology has strong anti-background light ability, and experiments verify the relationship between the modulation depth and modulation time of the light source and the imaging quality. The theoretical analysis results are basically the same, and this work is of great significance for high-resolution imaging and recognition applications in complex environments.
Related papers were published on Optics Express. Related research has been supported by the National Defense Basic Research Program and the Excellent Membership Fund of the Youth Innovation Promotion Association of the Chinese Academy of Sciences.