最优正交信号分解的FPGA实现.pdf

203 Vol. 20 No.3 2005 9 Journal of Data Acquisition Processing Sep. 2005 : 1004-9037(2005) 03-0361-05 FPGA 1 2 邵　杰, 叶　宁 ( 1. , ,210016; 2. , , 210042) : 获取回波信号的同相分量和正交分量对于声纳系统的数字波束形成器非常重要。 文提出了一种采用最 大误差最小化准则来优化数字希尔伯特(Hilbert) 变换滤波器的方法, 用以获取幅度和相位严格平衡的正交信 号, 并在此基础上给出了基于现场可编程门阵列( ) 的分布式 算法的硬件实现结构。实验结果表明这种 FPGA DA 方法稳定可靠, 达到系统实时要求。 : 正交信号; 希尔伯特变换; 有限冲激响应; 现场可编程门阵列 :T N911. 72; TN431.2:A Implementation of Optimum Quadrature Signals on FPGA 1 2 S H A O J ie , YE N ing ( 1. ollege of Information Science and T echnology, Nanjing U niversity of Aeronautics Astronautics Nanjing, , 210016, hina; 2.Department of Information Science, Nanjing ollege for Population Programme Management , Nanjing, 210042, hina) : - Abstract The extraction of the in phase and quadrature components from a received echo sig- nal is an important problem in the digital beamformer of sonar systems. T o obtain quadrature signals with the rigid amplitude and phase balances, an optimum digital Hilbert transforming method using the minimax criterion is provided. And the basic theory and the realizing dis- tributed arithmetic DA hardware structure based on FPGA are described Simulation and ex-( ) . perimental results show that the method is effective and satisfies the requirements for some high accurate and real time systems. Key words quadrature signals Hilbert transforming finite impact res