基于表面声波器件的GPS信号捕获技术研究  

Research of SAW Based on GPS Signal Acquisition

作　　者：李莉[1] 

机构地区：[1]北京电子科技职业学院通信技术系,北京100016

出　　处：《科学技术与工程》2014年第4期69-73,共5页Science Technology and Engineering

基　　金：北京市教委科研基地-移动宽带系统创新平台(PXM2010_014306_098718)资助

摘　　要：针对现有GPS信号处理方法的伴游的信号衰减和大频偏问题,提出了一种基于表面声波(surface acoustic wave,SAW)卷积器的解决方案。SAW卷机器在解决包括信号强度衰减以及多径衰落在内的信道衰落对GPS信号处理带来的问题有很强的优势。首先SAW卷积器通过超声波实现信号处理的特点,使得其对电磁波产生的干扰具有很强的免疫力;其次,SAW器件具有极高工作频率稳定度,从而有利于减小频率估计误差漂移;最后,基于SAW器件的GPS信号捕获结构对于减轻GPS信号捕获的远近效应同样具有优势。通过仿真与传统方法进行了比较,基于SAW卷积器的信号捕获方法对高动态的微弱GPS信号有更好的捕获性能。Aiming at the problem of that the proposed methods can not solve the signal degeneration ann frequency offset, a solution based on SAW is proposed. The SAW capacitors have advantages in solving such prob-lems： the property to realize signal processing by super-sound of SAW capacitors makes it immutable to the jam of electromagnetic wave; the SAW capacitors have high stability of working frequency, so they are possible to decrease the estimation error of frequency flotation ; the SAW capacitors also have advantage in decrease the far-near effect of GPS signal acquisition. In the situation of deep variation, SAW capacitors are cheaper. At the same time, com- pared with the traditional methods, the SAW based GPS signal acquisition method has better performance in captu- ring high dynamic weak GPS signals.

关 键 词：全球定位系统 表面声波器件 卷积器 弱信号 

分 类 号：TN967.1[电子电信—信号与信息处理]