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A robust entry guidance law is designed for drag tracking in Mars entry atmospheric flight for low-lifting lander with maximum lift-to-drag ratio of only 0.18. In the flight process the bank angle is the only control variable to be modulated to eliminate the tracking error when considering the initial derivation and parameter uncertainties. Firstly the tough problem of the guidance law design is analyzed...
In this paper, we present a very high-capacity and low-distortion 3D steganography scheme. Our steganography approach is based on a novel multi-layered embedding scheme to hide secret messages in the vertices of 3D polygon models. Experimental results show that the cover model distortion is very small as the number of hiding layers ranges from 7 to 13 layers. To the best of our knowledge, this novel...
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