改进窄相关的短多径抑制方法

Modified Narrow Correlator Spacing Method for Mitigation Short-Delay Multipath

在全球定位系统(GPS)中,多径效应严重影响着定位精度。虽然已经提出很多抑制多径的方法,但它们对短多径均无效。为了抑制短多径,在传统窄相关器的基础上,提出额外增加一个相关器,用于对窄相关的短多径误差进行定量估计并实时修正。此相关器是一个独立的相关器并不参与码跟踪过程,因此这个多径误差估计过程不会影响跟踪过程,也不存在硬件上的改动,所以很容易实现。最后用Matlab对算法进行了仿真,验证了该算法对短多径有很好的抑制作用。

The muhipath effect greatly reduces the positioning precision in global positioning system（ GPS）. Al- though many methods have been proposed to mitigate the muhipath, they are ineffective for short-delay mul- tipath mitigation. In order to mitigate the muhipath, a method is proposed to estimate and eliminate the short- delay multipath error in real-time by adding an additional correlator in the traditional narrow correlator spac- ing. The additional eorrelator doesn＇t involve in the code tracking process, so the error estimation process doesn＇t affect the code tracking and the hardware doesn＇ t need to be modified, which is very easy to imple- ment. This algorithm is simulated by Matlab, the effectiveness of the method for short-delay multipath mitigation is verified.