Through the system simulation, design a sliding mode controller which meet the parameters of discrete systems, and through the combination of DSP and FPGA core processing unit realize control algorithm, which is applied to the rudder servo system. 通过系统仿真分析，设计出满足离散系统的滑模控制器参数。并通过DSP与FPGA结合的核心处理单元实现滑模变结构控制算法，应用于舵伺服系统中。
On the structure of the controller, embedded DSP acts as core processing unit to deal with data sampling, calculating, processing and outputting controlling current to control the action of braking pressure-servo-valve. 在控制器的结构实现上，采用了嵌入式DSP作为核心处理单元，实现数据的采集、计算和处理，并输出控制电流来控制刹车压力伺服阀动作。
Generally, communication controller always use singlechip machine as the core processing unit, with serial communication chip extended etc, its structure is simple and the cost is low, so it applies to the application of slow speed and less task. 一般地，通信控制器大多采用单片机作为核心处理单元，外围辅以串行通信扩展芯片等，具有结构简单、成本低等特点，适用于速度慢、任务少的应用。
These simulators are based on DSP implementation for narrow-band HF channel in domestic, and the parallel signal processing capabilities is relatively poor. The research goal of this paper is to achieve a reconfigurable wideband HF channel simulator, whose core processing unit is FPGA. 国内多以DSP为核心处理器实现窄带短波信道模拟器，其并行信号处理能力比较差，本文以FPGA为核心处理单元，实现一款可重配置的宽带短波信道模拟器。
FFT / IFFT processor is the core data processing unit and is the key to realize data quadrature modulation and demodulation in OFDM system. The design of FFT / IFFT processor directly determines the performance of the OFDM system. FFT/IFFT处理器是OFDM系统中数据处理的核心单元，是OFDM系统中数据正交调制和解调的关键，FFT/IFFT处理器的设计直接决定着OFDM系统的性能。
