转发式低轨单星多普勒定位技术

Single LEO Satellite Doppler Transponding Positioning Method

摘要:

为提高卫星导航在复杂电磁环境和高纬度地域的应用，采用低轨卫星弥补卫星导航在信号功率和覆盖方面的不足，提出一种采用伪距和多普勒测量值的联合定位技术，分析了基于伪距和多普勒参数的定位原理，针对最小二乘收敛域狭窄问题给出一种结合网格搜索的定位解算方法，针对接收机钟差未知给出了基于转发和双向测量体制下的测量参数获取方法，并分析了单星定位误差的分布特性，指出误差分布对不同误差种类具有不同的敏感程度。最后给出一种特定卫星轨道下的定位结果，验证了算法的有效性，定位精度达到百米量级。

Abstract:

To improve the satellite navigation in complex electromagnetic environment and the application of high latitude area, Leo satellite for satellite navigation is adopted in signal power and the lack of coverage. Put forward a kind of using pseudo range and Doppler measurements of joint positioning technology, are analyzed based on pseudo range and the positioning principle of Doppler parameters, and according to least square convergence domain narrow problem is given a positioning algorithm combined with the grid search method, in view of the receiver clock error unknown is given based on forward and two-way parameter acquisition method of the measuring system, and analyzes the distribution characteristics of single star positioning error, points out that the error distribution of different types have different sensitive degree of error. Positioning under a particular satellite orbit is given as a result, the effectiveness of the proposed algorithm, the positioning accuracy can be hundreds of meters．