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GPS is very popular for locating the unmanned vehicles. However, it cannot solve all the problems about location. As crossroad is very important for unmanned vehicles, it is necessary for unmanned vehicles to recognize the crossroad and to load some other recognition tasks (such as traffic light recognition and traffic sign recognition) at the same time. The precision of GPS can hardly tell us if...
In this paper, a DDS-based C-band wideband agile frequency synthesizer is described. The DDS (Direct Digital Synthesizer) is used to achieve agile frequency hopping. The output of DDS is combined with four independent PLLs, which generate low phase noise LO signal, to expand the bandwidth. Measured results show that the frequency hopping time is shorter than 500ns. The spur suppression is better than...
Hardware implementation of multiprecision modular multiplications in public-key cryptography has led to various developments of scalable Montgomery modular multipliers, which are fast enough constrained from limited hardware resources. Among the candidates, the feedforward scalable Montgomery modular multiplier achieves low latency with simple logics and little change in the algorithm. However, the...
In 1998, Koç and Hung proposed a modular multiplication algorithm with carry save additions, in which a sign-detection method in carry save logic is utilized. In this work, the carry save additions in their algorithm are divided into two pipelined stages, so that Montgomery ladder can be used to interleave two nearby modular multiplications. Efficient full modular exponentiation can be performed in...
All dies are required to keep consistent angles in LED chip sorting. It is a problem because all chips are adhesive to wafer tape, each is rotated, and locations of all other dies change. Usually, visual rectification is used for this. While, each correction needs several adjustments, it may decrease production efficiency greatly. To solve this problem, an on-line angle correction method is put forward...
All dies are required to keep consistent angles in LED chip sorting. Usually, rectification orient real-time vision is used for this but it may decrease production efficiency greatly, because one correction may need several adjustments. Considering that all dies to be sorted are adhesive to wafer tape, each is rotated, locations of all other dies change. It is a problem for following positioning and...
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