城市环境下非视距信号探测改正方法

摘要

针对城市环境中信号遮挡、反射严重,导致导航定位精度较低、定位连续性较差,以及Urban Trench方法中建筑物模型方位角约束不足等问题,提出一种改进的Static Trench方法:重新构造建筑物遮挡方位角阈值,从而提高非视距信号正确探测与改正的几率,并提高定位精度.实验结果表明:该方法的定位精度可比传统方法提高约49%,且可用卫星数量无明显降低,保证了定位精度和定位连续性.%Aiming at the problems that it is vulnerable to low accuracy and bad continuity for navigation positioning under urban environment due to the obstructed and reflected signals,and the azimuth constraint of the building model in Urban Trench method is insufficient,the paper proposed an improved Static Trench method:the cut-off azimuth threshold of build-ings was reconstructed for increasing the probability of NLOS detection and correction and improving the positioning accura-cy.Experimental result showed that the positioning accuracy with the proposed method could be about 49 % higher than that with traditional method,and the number of visible satellites could be ensured,which would keep good accuracy and continuity of positioning.