Digital down converter （DDC） is the main part of the next generation high frequency （HF） radar. In order to realize the single chip integrations of digital receiver hardware in the next generation HF Radar, a new ...Digital down converter （DDC） is the main part of the next generation high frequency （HF） radar. In order to realize the single chip integrations of digital receiver hardware in the next generation HF Radar, a new design for DDC by using FPGA is presented. Some important and practical applications are given in this paper, and the result can prove the validity. Because we can adjust the parameters freely according to our need, the DDC system can be adapted to the next generation HF radar system.展开更多
本文主要论述了基于十进制的加密技术.以美国最新对称加密标准AES(A dvanced Encryption S tandard)为基础,对AES的4种加密运算进行重新设计,以适应十进制数的加密,同时结合混沌加密算法、随机加密算法设计基于十进制的加密算法.该算法...本文主要论述了基于十进制的加密技术.以美国最新对称加密标准AES(A dvanced Encryption S tandard)为基础,对AES的4种加密运算进行重新设计,以适应十进制数的加密,同时结合混沌加密算法、随机加密算法设计基于十进制的加密算法.该算法具有AES加密算法的特点,对明文和密文均具有很好的扩散性和混淆性,也有随机加密算法的加密运算的不确定性,也有混沌加密算法的密钥一次一密性.该算法适用于不可靠通信信道上的十进制数加密通信,能在预付费表计等实际系统中得到广泛的应用,实践证明该算法有很高的安全性.展开更多
文摘Digital down converter （DDC） is the main part of the next generation high frequency （HF） radar. In order to realize the single chip integrations of digital receiver hardware in the next generation HF Radar, a new design for DDC by using FPGA is presented. Some important and practical applications are given in this paper, and the result can prove the validity. Because we can adjust the parameters freely according to our need, the DDC system can be adapted to the next generation HF radar system.
文摘本文主要论述了基于十进制的加密技术.以美国最新对称加密标准AES(A dvanced Encryption S tandard)为基础,对AES的4种加密运算进行重新设计,以适应十进制数的加密,同时结合混沌加密算法、随机加密算法设计基于十进制的加密算法.该算法具有AES加密算法的特点,对明文和密文均具有很好的扩散性和混淆性,也有随机加密算法的加密运算的不确定性,也有混沌加密算法的密钥一次一密性.该算法适用于不可靠通信信道上的十进制数加密通信,能在预付费表计等实际系统中得到广泛的应用,实践证明该算法有很高的安全性.
