Aiming at the imaging algorithm of high-pulse-repetition random-frequency-hopping synthetic wideband radar on a supersonic/hypersonic aircraft platform, this study established an echo simulation model of target and clutter, analyzed the special range-Doppler coupling effect and its influence on imaging, and proposes a method of imaging with pipeline-parallel processing based on generalized 2D matched-filtering and Doppler pre-processing. In the method, Doppler-beam-sharpening was advanced to be performed with the pulse compression process in each frame, and the special range-Doppler coupling effect caused by high dynamic motion of platform and random frequency hopping in bandwidth synthesis was well suppressed; several modes of random frequency hopping were designed and the pipeline-parallel image processing algorithm was optimized for each mode. Theoretical analysis and simulation results show that the proposed imaging method can effectively avoid the divergence of 2D range-Doppler images in the range direction, and can meet the requirements of real-time imaging.
Absorptive chaff is a light and high-efficiency kind of passive jamming material, which can decline echo amplitude enemy detection that equipment receives largely scattered in the air, thus reducing the probability of being found and tracked by radar equipment. In this paper, the jamming performance of absorptive chaff cloud on radar wave is studied. First, combining the existing research result, the jamming mechanism of absorptive chaff cloud on radar wave is analyzed. Then, according to transmission-line theory and energy conservation principles, the models of reflection loss and transmission loss on the surface of absorber. Finally, the power attenuation model is built, according to which, how radar maximum range changes after interference is obtained. Simulation results show that, absorptive chaff cloud has obvious weaken effect on radar wave. With 100 meters' thickness, the attenuation can reach 23.4dB, which has some value of application in the battleground.
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