建筑材料特性对GPS监测信号影响规律的试验研究

Test for influence of common construction materials on GPS monitoring signals

为了研究常用建筑材料对GPS监测信号的影响规律,进行了多路径误差的试验研究。建立了一套GPS多路径信号模拟与监测系统,通过在流动站天线不同高度、不同距离处安置具有不同介电常数的木板、PVC板和瓷砖,分别获取了三种材料连续两天的GPS监测数据;将改进的粒子滤波算法用于GPS数据后处理中,通过比较发现,试验结果与GPS多路径信号的仿真结果吻合较好,同一种反射材料在不同距离时引起的多路径误差随着距离的增加而逐渐减小,且在增加相同距离的情况下减小的幅度越来越小;具有不同介电常数的反射材料在相同的距离时引起的多路径误差随着介电常数的增大而增大。

In order to study influence of common construction materials on GPS monitoring signals,the test of multipath error was performed.A set of simulating and monitoring systems for GPS multipath signals was established,and the continuous two-day-long GPS monitoring data of different materials were obtained by placing boards,PVC sheets and ceramic tiles with different dielectric constants at different heights and distances from the receiver antenna.The improved particle filtering algorithm was used in the GPS data post-processing.By comparison,it was shown that the experimental results coincide with the simulation ones of GPS multipath signals very well;the multipath errors caused by the same reflecting material decrease with increase in distances,and under the condition of the same increase in distance the level of decrease is less and less;the multipath errors caused by the reflecting materials with different dielectric constants and the same distance increase grow with increase in dielectric constants.