A design study on complexity reduced multipath mitigation

[摘要] Global navigation satellite systems, e.g. the current GPS and thefuture European Galileo system, are frequently used in carnavigation systems or smart phones to determine the position of auser. The calculation of the mobile position is based on the signalpropagation times between the satellites and the mobile terminal.At least four time of arrival (TOA) measurements from four different satellites are required to resolve the position uniquely.Further, the satellites need to be line-of-sight to the receiver forexact position calculation. However, in an urban area, the directpath may be blocked and the resulting multipath propagation causeserrors in the order of tens of meters for each measurement.and in the case of non-line-of-sight (NLOS), positive errors in the order of hundreds of meters.

In this paper an advanced algorithm for multipath mitigation knownas CRMM is presented. CRMM features reduced algorithmic complexityand superior performance in comparison with other state of the artmultipath mitigation algorithms. Simulation results demonstrate thesignificant improvements in position calculation in environmentswith severe multipath propagation. Nevertheless, in relation totraditional algorithms an increased effort is required for real-timesignal processing due to the large amount of data, which has to beprocessed in parallel. Based on CRMM, we performed a comprehensivedesign study includinga design space exploration for the trackingunit hardware part, and prototype implementation for hardwarecomplexity estimation.

[学科分类] 电子、光学、磁材料