GPS卫星信号模拟器中频信号处理与实现  

Implementation of IF signal processing in GPS satellite signal simulator

作　　者：李保柱[1] 张其善[1] 杨东凯[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083

出　　处：《北京航空航天大学学报》2006年第7期811-814,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金资助项目(60027001);北京市科技新星计划资助项目

摘　　要：利用数字内插、数字滤波、A/D(Analog/D igital)变换等软件无线电方法,建立GPS卫星信号模拟器中频信号处理的数学模型,提出了数字IF(Intermed iate Frequency)的实现方法,且在matlab中进行了中频电路建模、优化和验证,完成了从数字基带信号处理到模拟中频信号生成.电路实现时尽量降低信号处理频率,缩小高频信号处理范围.利用verilog在ISE6.3中完成了数字中频模块的设计和仿真,对仿真输出的数字序列进行FFT(Fast FourierTransform A lgorithm)频谱分析,并在FPGA(Field Programmable Gate Arrays)中实现.With the techmque ot sottware radio in digital interpolation, digital filtering, A/D （analog/digital） converter, a mathematic model for signal processing of digital IF （ intermediate frequency） in the GPS satellite signal simulator was established, and the approaches achieving the practical hardware design was implemented. The algorithm and design model for the circuit implementation was verified and optimized with Simulink in Matlab, the processing from digit base-band signal to analogue IF signal generation was achieved. The signal processing frequency was reduced to the best of our abilities for the circuit, and the processing area in the board for the high frequency signal was minimized. With the Xilinx＇ ISE development tool and FPGA（ field programmable gate arrays） using Verilog, the design and emulating of digital IF was implemented, and the digit signal was also analyzed with FFT（ fast Fourier transform algorithm） frequency spectrum.

关 键 词：全球定位系统(GPS) 模拟器 数字内插 数字滤波 

分 类 号：P228[天文地球—大地测量学与测量工程]