基于NIOSII的多模导航接收机跟踪环路  

Tracking Loop in Multi-mode Navigation Receiver Based on NIOSII

作　　者：邢兆栋[1] 赵维刚[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]石家庄铁道学院,河北石家庄050043

出　　处：《无线电工程》2009年第8期32-33,37,共3页Radio Engineering

摘　　要：硬件实现卫星导航接收机时,信号跟踪、数据解调、原始观测量提取、定位解算功能通常由DSP或ARM实现,捕获及通道由FPGA实现。多模卫星导航接收机是未来发展趋势,其通道数目多。为降低外部处理器计算负荷,将数据解调、环路跟踪、原始观测量提取功能由NIOSII实现。跟踪环路不使用float型计算可节约硬件资源。据跟踪环路原理,采用递推方法进行分析,以32位整型计算进行实现。测试表明计算误差小,计算速度高,节约了FPGA资源。In hardware implemented satellite navigation receiver, functions such as signal tracking, data demodulation, raw t acquisition and positioning resolution are generally performed by DSP or ARM, and acquisition and channel performed by FPGA Multi-mode satellite navigation receiver, which has more channels, has become the trend of development. In order to decrease the external processor computing load, data demodulation, loop tracking and measurement acquisition functions are implemented by NIOSII. Hardware resources can be saved without using float type computation for tracking loop. According to loop filter principle, the tracking loop is realized in 32-bit integer mode through deducing method. Test results show that the computing error is low, the computing speed is high and FPGA resources are saved.

关 键 词：跟踪环路 NIOSⅡ 全球定位系统 

分 类 号：TP228.4[自动化与计算机技术—检测技术与自动化装置]