fpga VHDL语言，控制DDS产生频率可变的正弦波信号扫频

。给出了时域滤波的基本原理以及通常采用的 IIR 椭圆地物杂波滤波器的设计方法。重点研究了回归滤波器这一时域滤波算 法。从正交多项式的拟合出发，给出了回归滤波器抑制地物杂波的基本原理及 其滤波实现过程。通过对回归滤波器的计算复杂度的研究，寻找使回归滤波器 计算量最小的正交多项式。分析了回归滤波器频率响应特性，比较了回归滤波 器与IIR 椭圆地物杂波滤波器的计算复杂度。利用仿真的雷达信号，分析了回 归滤波器的地物杂波抑制性能。回归滤波器实际上是一高通滤波器，它在滤掉 低频地物杂波的同时，对落在滤波器阻带内的天气回波信号同样会造成衰减。 在天气回波信号谱宽固定的情况下，通过改变天气回波信号的平均多普勒频率， 分析了回归滤波器对它的衰减情况。在基于一组实际采集的雷达信号的基础上， 给出了回归滤波器的地物杂波抑制比随着滤波器阶数的变化情况。(Firstly, this dissertation introduces the research background and significance of ground clutter suppression, analyzes the characteristics of the ground clutter and weather signals in the Doppler weather radars and simulates Doppler radar echo signals (It includes ground clutter, weather echo signals and the mixture of them). The simulated signals are used later to study the time and frequency domain ground clutter suppression. Secondly, this dissertation talks about the time domain filtering, gives the basic theory of time domain filtering and describes the design method of the usually used fifth-order elliptic infinite impulse response (IIR) ground clutter filter. In the time domain, the work focuses on the regression filter. From the orthogonal polynomials fit, this dissertation gives the basic theory of the regression filter for ground clutter suppression and the filtering process using a regression filter. Through the study of the computational complexity of regression)

本文为verilog的源代码-In this paper, the source code for Verilog

附件 介绍了如何 使用compxlib命令编译Xilinx的ModelSim仿真库，创建这个仿真库对ISE调用modelsim是必不可少的一步,该法完全自动化，免去繁杂的手动操作，是创建这个仿真库最简洁的方法之一-Annex compxlib introduce how to use Xilinx

I2C端口的FPGA实现，网上较多，但发现不少有问题，这个是在网上代码的基础上修改过，验证可行。-I2C port FPGA, online more, but found that many problems This is a code on the Internet on the basis of the revised test feasible.

调制与解调系统的FPGA设计实现,包括2-ASK调制和解调,2-FSK调制和解调,2-PSK调制和解调,QPSK调制和解调,PPM调制和解调的verilog源代码。(FPGA design implementation of modulation and demodulation system, including 2-ASK modulation and demodulation, 2-FSK modulation and demodulation, 2-PSK modulation and demodulation, QPSK modulation and demodulation, PPM modulation and demodulation verilog source code .)

verilog例子资源，对于初学者很有帮助。-verilog examples of resources are very useful for beginners.

适用于FPGA的SOPC方面的元器件添加，如COMPNENT-Applicable to FPGA-SOPC area to add components, such as COMPNENT

hilbert 变换的vhdl源代码，来源于网上，本人也做过简单的8抽头的，但这个的算法还没搞懂，希望懂行的下载了研究一下，给个中文的简单的说明！(hilbert transform VHDL source code from the Internet, I have been a simple 8-tap, but even before they get to know this algorithm, I hope knowledgeable downloaded to look for a simple description of the Chinese!)

Verilog实现 spi接口的FPGA实现 通过仿真，修改后即可应用-Verilog realize spi interface FPGA to achieve through the simulation, the application can be modified

UMC 90nm design kit. please read before using thee models.