基于多载波定位系统的模糊度算法研究

Ambiguity Algorithm Based on Multi-Carrier Positioning System

采用了多载波定位技术提高定位精度的原理,建立了系统的数学模型,在此基础上模拟仿真了静态情况下GPS系统采用2和3个载波,G alileo系统采用2、3和4个载波定位时,模糊度的平均建立时间和均方差随基线长度变化的关系。证明了采用多载波定位的效果优于双载波定位的效果,给出了仿真结果。

Multi-carrier transmission technology makes full use of frequency and resists multi-address interferences and frequency spreading. So it is frequently used to avoid the equilibrium on the whole bandwidth and overcome the pulse noise influence. In the full paper, we explain in detail the principles of highly accurate multi-carrier positioning systems （see eqs. 4 through 7 in the full paper）. In this abstract, we just add some pertinent remarks to listing the following two topics of explanation： （1） the establishment of the mathematical model of the system; （2） the modeling of the system; a simulation is carried out under static conditions when the GPS uses two or three carriers whereas the Galileo system uses two, three or four carriers. The simulation results, given in Figs. 2 through 5 in the full paper, indicate preliminarily that the mean time to fix ambiguity and root mean square（RMS） vary directly as the baseline lengths of the systems. The paper concludes preliminarily that for the GPS and the Galileo system under identical static conditions, the multi-carrier positioning system needs shorter mean time to fix ambiguity and achieves smaller RMS than dual-carrier one, thus having better positioning effects.