针对单卫星系统出现信号盲区的问题,提出基于GPS,北斗和DTMB组合的无缝定位方案,实现户外、城市、室内的无缝定位。仿真表明,与传统星座选择算法比较,改进的星座选择算法具有明显的优势,如定位精度更高,计算时间更短,计算复杂度更低,几何精度因子更小。且当采用16组信号源时,有95%相对比值的偏差值小于0.15,有90%相对比值的偏差值小于0.1,有88%相对比值的偏差值小于0.05。

To overcome the problem of signal dead zone in single satellite system, this paper put forwards a seamless positioning scheme based on GPS, Beidou and DTMB signal sources, it can achieve seamless positioning in three different areas: outdoor, urban and indoor. Simulation result shows that compared with the traditional constellation selection algorithm, the improved constellation selection algorithm has obvious advantages, such as higher positioning accuracy, shorter computation time, lower computational complexity, and smaller geometric accuracy factor. When using 16 groups of signal sources, there is a 95% relative deviation less than 0.15, a 90% relative deviation less than 0.1, and an 88% relative deviation less than 0.05.