GPS/Galileo双模捕获引擎的VLSI实现

VLSI implementation of GPS/Galileo dual mode acquisition engine

随着卫星导航进入多星座时代,兼容GPS和Galileo的双模接收机成为目前卫星导航接收机设计的热点。捕获是卫星导航接收机基带信号处理的关键部分之一。本文通过对两种信号捕获算法的分析,提出了一种可以兼容GPS和Galileo信号的捕获引擎的VLSI结构。该结构兼顾了GPS和Galileo的信号特点,可以对GPS信号进行时域并行搜索和对Galileo信号进行时域部分并行搜索。最后给出了该结构各个组成单元的设计方法,在Altera公司的EP2S180FPGA器件上验证通过,并在0.18μm的CMOS工艺下综合,电路规模是3514231平方微米。

With the satellite navigation entering multi-constellation Global Navigation Satellite Systems era,the GPS/Galileo dual mode receiver becomes the hot topic in navigation field. Acquisition is one of the key technologies in the baseband signal processing of the navigation receiver. In this paper, a VLSI architecture for GPS/Galileo signal acquisition engine is proposed based on the analysis of the acquisition algorithms of the two signals. The proposed architecture completes the parallel searches for GPS signals and the partially parallel searches for Galileo signals in time domain according to the features for these two signals. The modules in the architecture are deserihed in detail and the architecture is implemented in an Altera EP2S180 device. The synthesis results using 0.18μm CMOS cell library show that the scale of circuits is 3514231 μm^2.