CAJ | 학술논문

高速率的数字系统中常采用降速抽取的方法减轻数据运算量,造成信息的丢失.为确保测量精度,该文基于先进先出(FIFO)作数据缓存的方法,设计了一个数字中频幅相接收系统,对数字本振、数字下变频、幅相计算等关键技术进行了讨论和仿真分析.给出了对调幅、调制脉冲信号解调的试验结果,动态范围＞50 dB,幅度波动＜0.25 dB.
고속솔적수자계통중상채용강속추취적방법감경수거운산량,조성신식적주실.위학보측량정도,해문기우선진선출(FIFO)작수거완존적방법,설계료일개수자중빈폭상접수계통,대수자본진、수자하변빈、폭상계산등관건기술진행료토론화방진분석.급출료대조폭、조제맥충신호해조적시험결과,동태범위＞50 dB,폭도파동＜0.25 dB.
Decimation is always employed to reduce computation in digital receiver with high speed data rate.But this method will cause data lost.In order to increase the accuracy of measurement,FIFO using for data buffer was proposed in this paper.A digital receiver was designed.Critical technologies such as NCO,DDC and computation of the amplitude and phase were discussed in detail.Simulation results were given.Also the test results for demodulating the AM,pulse signal were shown that dynamic range was greater than 50 dB,ripple of amplitude was less than 0.25 dB.