基于软件无线电技术的GPS软件接收机的研究与实现

深入研究了GPS软件接收机的相关算法,阐述了GPS软件接收机设计过程中信号搜索、跟踪以及伪距定位等关键技术。针对搜索过程中利用信号相关法求解精频速度慢的缺点,提出了相位关系解算法;进一步分析二阶跟踪环路工作原理,对其带宽进行优化设计,使接收机具备较高的动态性能和较低噪声影响。基于Matlab环境,通过优化算法结构,设计并实现了GPS软件接收机算法应用程序。最后通过实际测试数据对算法进行了验证,该接收机可以处理12通道卫星信号,并且各项指标分析结果均达到单点伪距定位要求。

Design and Implementation of GPS Software Receiver Based on Software-Defined Radio

The key processing algorithms for GPS software receiver are introduced and the signal acquisition,the tracking loop and the pseudo-range position are described.Since the signal correlation algorithm cannot meet computational requirements of the fine frequency resolution,a new algorithms is presented by using the phase relationship.For the tracking loop,an optimized bandwidth algorithm is designed,and it makes the receiver have a better dynamic performance with less noise infection.In the Matlab environment,after optimizing the algorithm frame,the GPS software receiver program is designed and implemented.Finally,real data testing results demonstrate that the GPS software receiver can acquire and track satellites up to 12 channels.The single-point position and velocity accuracies reach a reasonable level when using 1 ms coherent integration time.