本文介绍了一种数字式下变频器的控制系统。
This paper introduces a numeral down converter control system.
数字下变频技术是软件无线电中的关键技术之一。
Digital variable frequency is a key technology of soft radio.
与发射机相对应，接收机采用二次下变频的结构。
Corresponding to transmitter, receiver USES two down-conversions structure.
数字下变频技术是软件无线电中的关键技术之一。
Digital down converting is one of the key technologies of software radio.
提出了一种基于多相滤波的宽带数字下变频技术。
This paper proposes a technique of wideband digital down-convert based on polyphase filtering.
数字下变频技术是数字化雷达接收机的关键技术之一。
Digital down - conversion (DDC) is an important technique of digitized radar receiver.
采用双变频调速技术，日本松下变频器，保证机器各部位运行同步。
The machine adopts dual-frequency conversion timing technology and Japan panasonic transducer, assuring every part drives synchronously.
在接收信号的数字化、软化的实现中，数字下变频起着重要的作用。
Digital downcoversion plays a key role in the digitized and software-oriented process of the received signal.
数字下变频在接收系统的数字化和软件化过程中起到了至关重要的作用。
Digital down conversion plays a key role in the digitized and software-oriented process of the receiver system.
分析了基于多相滤波结构的宽带侦察接收机中频数字信号下变频处理方法。
This paper analyzes the digital down conversion (DDC) of wideband reconnaissance receiver IF digital signal based on polyphase filtering.
论文在最后给出了在处理机实验平台上进行的数字上下变频系统的实验结果。
The last part gives the test results of digital up convert and digital down convert system, produced by the experimental platform.
DSP和数字上变频和下变频技术是构建高频雷达通用硬件平台的关键技术。
The DSP, Digital Up Converter ( DUC ) and Digital Down Converter (DDC ) are key technology of a hardware-platform.
从而有可能避免使用专用硬件下变频器，使硬件电路更简化和增加系统的灵活性。
This will avoid using special hardware of digital down converter, make hardware simpler and increase the flexibility of system.
提出了一种数字下变频的FPGA实现方案，实现了高速、高性能的数字下变频。
DDC method based on FPGA is put up in this paper, which is realized with a high speed and a high performance.
在此基础上，介绍了中频数字采样单元和基于FPGA的数字下变频单元的具体设计。
Based on these elements, the material design of if sample and digital down converter based on FPGA is specified.
在信号的中频数字接收过程中，数字下变频、载波频率与相位跟踪是设计的关键所在。
In the process of signal digital intermediate-frequency received, digital down convertion, frequency tracking of carrier and phase locked loop are the keys.
设计并优化了一个基于共用跨导级结构的用于超高频rfid阅读器的正交下变频混频器。
A quadrature down-conversion mixer based on this topology is designed and optimized for an ultra high frequency RFID reader.
本文主要研究的是基于现场可编程逻辑阵列（FPGA）的数字上下变频技术的设计和实现。
This paper deals with the design and implementation of Digital Up Conversion and Digital Down Conversion based on the field-programmable gate array (FPGA).
介绍了基于FPGA完成HSP50214B的下变频功能，此设计方案具有一定的灵活性。
This article describes the function of digital downconverter HSP50214B that based on FPGA, this scheme of the design has the definite adaptability.
为满足卫星测控业务的要求、完成C频段遥测信号的接收工作，本课题研制了C频段下变频器。
The subject derives from the project of "C-band Down Converter" , which is contented with the satellite testing and controlling system. It deals with the signal from the satellite.
在宽带数字接收机中，高速数据流的实时处理对后继数字下变频器性能提出了极为苛刻的要求。
The real time processing of high speed data flow makes strict demands on the performance of descendant digital down converter in the wideband digital receiver.
为满足卫星测控业务的要求、完成C频段遥测信号的接收工作，本课题研制了C频段下变频器。
The subject derives from the project of "C-band Down Converter" , which is contented with the satellite testing and controlling system.
该电路采用二次变频低中频结构，集成了低噪声放大器、上变频混频器、下变频混频器等模块。
An RF front-end circuit for a fully integrated CMOS DTV tuner is presented in this paper, where double-conversion low IF architecture is employed.
在此基础上，提出了数字下变频技术在可编程数字下变频器HSP50214 B中的应用方案。
On the base of these, the paper analyzes applications of digital down converting in the HSP50214B programmable downconverter.
接着介绍了接收机的构成和数学模型、采用的信号采集芯片及实现数字化下变频的主要器件—FPGA。
Then the receiver structure and mathematical model, signal collection chip and fpga-main implementation device of digital down conversion are introduced.
数字下变频技术的基本功能是将宽带高速数据流信号转变成窄带低速数据流信号，以便DS P实时处理。
The basic function of digital down-conversion technology is to transfer wideband high speed data signals into narrowband low speed data signals, so that DSP can process them in real time.
接收部分主要是扩频系统的数字下变频、积分清洗、匹配滤波器解扩、功率检测、符号跟踪、差分译码等技术。
The receiver unit mainly consisted of the digital down converter, matched filter, integration and dump module, power detector, symbol tracking processor, differential demodulator and so on.
在理论分析的基础上，本文设计了一个应用于北斗卫星导航系统接收机芯片中的低噪声放大器和下变频混频器。
On the base of theory analysis, a LNA and a mixer of a receiver chip used in compass navigation satellite system have been designed.
在接收模式下，则利用DDS技术产生接收信号下变频所必需的本振信号，然后采用DBF技术形成接收波束。
In receiving mode, through controlling DDS, it produces the local oscillation signal needed by down frequency conversion of the receiving signal. Then the DBF is used to form the receiving beam.
在接收模式下，则利用DDS技术产生接收信号下变频所必需的本振信号，然后采用DBF技术形成接收波束。
In receiving mode, through controlling DDS, it produces the local oscillation signal needed by down frequency conversion of the receiving signal. Then the DBF is used to form the receiving beam.
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