论文部分内容阅读
全球卫星定位系统(GNSS)需要至少4颗卫星才能提供持续、准确的定位结果。在有障碍物遮挡的城市街道、山谷或者存在压制式干扰的战场环境中,往往会出现可见星数量降低至4颗以下的情况。针对只有2颗可见星的定位问题,提出了通过相对位置变化对绝对位置进行解算的定位模型,证明了该模型的可行性,并研究了该模型的数值计算方法和几何搜索方法。仿真实验和实际跑车试验表明,在只有2颗可见星条件下,该方法的定位精度明显优于传统的INS/GNSS紧组合算法,并且对初始位置的精度不具有依赖性。
Global Positioning System (GNSS) requires at least 4 satellites to provide consistent and accurate positioning results. In the sheltered city streets, valleys or in the presence of repressive interference battlefield environment, the visible number of stars often appears to be reduced to less than 4 cases. Aiming at the localization problem of only two visible stars, a positioning model that solves the absolute position through the relative position change is proposed. The feasibility of the model is proved. Numerical calculation and geometric search of the model are also studied. Simulation experiments and actual sports car tests show that the positioning accuracy of this method is obviously superior to the traditional INS / GNSS tight combination algorithm under the condition of only 2 visible stars, and it has no dependence on the initial position accuracy.