一种Nios Ⅱ软核架构的高效GPS捕获方法  

The GPS acquisition method based on Nios Ⅱ soft core

作　　者：田嘉[1] 王伟[1] 史平彦[1] TIAN Jia;WANG Wei;SHI Ping-yan(China Academy of Space Technology(Xi′an),Xi′an 710100,China)

机构地区：[1]中国空间技术研究院西安分院

出　　处：《微电子学与计算机》2019年第11期7-10,共4页Microelectronics & Computer

摘　　要：针对传统GPS接收机不能根据接收信号的特性自适应的调节频率搜索范围及积分时间的问题,本文提出了一种Nios Ⅱ软核架构的高效GPS捕获方法,其可以通过Nios Ⅱ软核自适应调节频率搜索范围、相干积分时间及非相干积分时间,流水线式的VHDL结构仅负责并行处理,实现了参数调节的灵活可控.通过采用仅有一片Stratix Ⅲ FPGA的基带开发板,实测结果表明,捕获功能性能正常,频率捕获范围可在100 Hz^80 kHz内灵活切换,积分时间可在1 ms^30 s内灵活切换.In order to solve the problem that the traditional GPS receiver cannot adjust the frequency search space and integration time adaptively according to the characteristics of the received signal, the GPS acquisition method based on Nios Ⅱ soft core is presented by this paper. The Nios Ⅱ soft core is responsible for accommodate the frequency search space, the coherent integration time and the non-integration time. The VHDL part of assembly line structure is responsible for the parallel data processing. Therefore, the parameters can be adjusted adaptively by the method. By using the conception product which embeds 1 Stratix Ⅲ chip, real test result shows that the acquisition works well, the frequency search space can be changed within 100 Hz-80 kHz and the integration time can be changed within 1 ms-30 s.

关 键 词：NIOS Ⅱ 信号捕获 STRATIX Ⅲ FPGA GPS 

分 类 号：V11[航空宇航科学与技术—人机与环境工程]