1.The research including:1) Design of pipelining 32-bit frequency-phase accumulator with LFM(Linear Frequency Modulation);
主要研究内容包括:1)可以实现LFM(Linear Frequency Modulation)功能的32位流水线相位累加器的设计;
2.The chip takes the 0.5μm standard CMOS process. The input voltage range is from 0.9V to 2.0V, and the output voltage is 3V. The control scheme is Pulse Frequency Modulation (PFM).
它采用0.5μm的工艺制程,输入电压范围为0.9V~2V,输出电压为3V; 采用脉冲频率调制方式(Pulse Frequency Modulation,缩写为PFM);
3.It also presented a method of realizing frequency modulation by real-time changing frequency tuning word of high-speed phase accumulator, Frequency sweep, FM and FSK modulation are analyzed and designed. The data can be built stably and the frequency be synthesized is correct.
重点对高速相位累加器、FM、扫频、FSK等调制的实现方法进行了分析并基于FPJ进行,数据能够稳定建立,频率合成正确。
4.On the basis of design of DDS utilizing FPGA, it presented a method of realizing the altitude modulation by generating the main wave and the modulation wave respectively, and the frequency modulation by changing frequency tuning word of main DDS.
在利用FPGA实现DDS的基础上,使用两路DDS分别产生主波形和调制波形,方便地实现两个任意波信号的幅度调制; 同时,通过调制波形数据实时控制主DDS的频率控制字,用数字的方法直接实现波形的各种频率调制。
5.Switching Power Supply has three kinds of control circuits: Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), Pulse Width and Frequency Modulation (PWM-PFM).
开关电源有三种控制方式：脉冲宽度调制(PWM)、脉冲频率调制(PFM)、脉冲宽度频率调制(PWM-PFM)。
6.The power spectral analysis is performed for the daily 500 hPa height field data in the mid-high latitudes of the Northern Hemisphere from 1950 to 2003.The results show that:(1) ENSO episodes have the frequency modulation effect on low-frequency oscillation (LFO) in the extra-tropical latitudes of the Northern Hemisphere,i. e. Intensity of low-frequency oscillation in winter is stronger than that in summer.
用1950-2003年北半球中高纬逐日500 hPa高度场资料进行功率谱分析得出：(1)ENSO事件对中高纬大气低频振荡有调频作用,即夏季低频振荡较弱,冬季低频振荡较强。
7.The Bluetooth adopts the 2.4GHz ISM frequency band and the frequency modulation and Frequency Hopping,and use the FEC、 ARQ、 TDD and BBP.
它采用2.4GHz ISM频段和调频、跳频技术,使用前向纠错编码、ARQ、TDD和基带协议。
8.Self-adaptive control technology is put forward to solve problems such as low heat storage capability,poor loadability in response,which makes it difficult to realize primary frequency function.Because of this technology,the boiler,turbine and generator could work together,restrict and coordinate one another to respond to power grid frequency variation.This technology gives a solution to the poor primary frequency modulation of once-through boiler.
针对直流锅炉机组蓄热能力低、快速响应负荷能力差,难以实现一次调频功能的问题,提出采用自适应控制技术,使锅炉、汽轮机、发电机之间相互配合、相互制约、整体协调响应电网频差的变化,解决了超临界直流锅炉机组一次调频能力差的问题。
9.A Pseudorandom Code Phase Modulation and Sinewave Frequency Modulation Combined Fuse。
伪随机码调相与正弦调频复合引信
10.On the basis of theoretical analysis to the feasibility of variable stiffness natural frequency modulation for elastic supporting beam, the general designing scheme of variable stiffness modulation device, which was composed of electro-vibratory-excitation styled vibration system and of Archimedes spiral disc (A-spiral disc) transmission, was established. Analysis and calculation were carried out on the essential designing points of the transmission and force bearing status of A-spiral disc and pawl tooth at the bottom of moving abutment.
在弹性支承梁变刚度调谐固频可行性的理论分析基础上,确立了由电动激振方式的振动系统和阿基米德螺线盘(阿线盘)传动组成的变刚度调节装置的总体设计方案,并对阿线盘、移动支座下端爪齿、传动受力情况等的设计要点进行了分析与计算。
