高动态下三阶信号源的设计与实现  

Simulation and Design of Third-Order High Dynamics Signal Source

作　　者：刘芊岑[1] 裘正定[1] 沈超[1] 

机构地区：[1]北京交通大学信息科学研究所,北京100044

出　　处：《计算机技术与发展》2008年第5期197-199,202,共4页Computer Technology and Development

摘　　要：高动态环境下,由于发射信号的卫星与接收机之间存在着高速的径向相对运动,必然导致载波信号存在多普勒频移、多普勒一次变化率及多普勒频移的二次变化率。目前现有的三阶信号源硬件实现较为复杂,且所需先验参数较多。文中基于高动态信号源的基本原理,提出了一种新的三阶信号源的实现方法,并基于现场可编程门阵列(FPGA)的硬件平台,应用VHDL语言予以设计实现。利用Matlab和DSP builder对信号源输出结果进行验证,验证了该方法的可行性。实践证明,该方法可大大降低工程实现的难度,占用硬件资源较少,满足高动态下对信号实时捕获的要求,为模拟卫星运动时的高动态环境提供了重要的参考价值。Since the existence of high speed relative motion between the rcceiver and the satellite which transmit signal during the high dynamics, the carrier signal is caused to be composed of the Doppler shift, the acceleration of Doppler and the jerk of Doppler. Generally, the hardware design of third - order signal source is complex, and much pre- preference is needed. On the basis of the principle of the high dynamics signal source, a method of the third - order high dynamics signal source is introduced. A new hardware design of FPGA- based employing a hardware description language （VHDL） is proposed. And the simulation result from Matlab and DSP builder approves that the project is feasible. The difficulty in hardware design will be reduced obviously and the hardware resource consumed will be less. At the same time, the method can satisfy the demand of real - time signal acquisition in high dynamics. The important reference value for simulating the performance of satellites in high dynamics is also analyzed in this paper.

关 键 词：高动态 卫星多普勒 多普勒一次变化率 多普勒二次变化率 FPGA 

分 类 号：TN911.7[电子电信—通信与信息系统]