摘要
在全球定位系统信号不可见的情况下,可使用伪卫星系统扩展其使用范围,全球定位系统信号发生器是其中的关键组成设备。本文提出采用高速的数字信号处理器快速有效的实现中频信号调制,介绍了该系统软硬件构架以及实现过程,并利用扩展直接存储访问方式提高了数据调制和发送速率。最后分析输出信号的特性,表明此方案正确可行。
GPS pseudolites systems were employed to extend the availability of GPS when satellites signals were not seen. GPS signal generators were the core part of pseudolites system. This paper presented an effective GPS intermediate frequency signal modulation method using high-speed DSP. System＇s hardware and software design were descr/bed; EDMA method was used to reach the speed requirement for data modulation and transmission. At last the result was given and showed the performance of signal generator reached the system design.
出处
《微计算机信息》
北大核心
2007年第32期178-179,172,共3页
Control & Automation
基金
上海市重大科技攻关项目资助(05dz15006)
