一种新的星载TDOA/FDOA/AOA联合定位算法

针对双星时频差定位体制在星下轨迹附近区域存在定位盲区的问题，提出一种单星二维干涉仪测向（AOA）与双星到达时差（TDOA）/到达频差（FDOA）联合定位方法。采用更精确的WGS_84地球模型，通过构造子空间基矢量恒等式以及地球表面约束获取联合观测的伪线性定位方程，实现了双星TDOA/FDOA/AOA联合高精度定位。在相同场景下将时频差定位算法和提出的联合定位算法进行比较，仿真结果表明该算法可缓解时频差定位盲区缺陷，星下轨迹附近区域的定位精度可至少提升两倍以上。

Novel joint geolocation algorithm for spaceborne TDOA/FDOA/AOA

Aiming at the problem of existing locating blind zones in the region near the satellite ground track of the TDOA and FDOA dual-satellite geolocation system, this paper proposed a joint geolocation algorithm with AOA/TDOA/FDOA measurements. It used a more accurate earth model called WGS_84 to construct subspace based vector identity and earth surface constraints, and to get the pseudo-linear positioning equation for joint observation. It realized dual-satellite high accurate joint positioning with TDOA/FDOA/AOA. This paper compared TDOA and FDOA algorithm with the proposed method in the same scene. Simulation results show that the proposed algorithm can ease the defects of TDOA and FDOA dual-satellite geolocation, and increase the precision in the region near the satellite ground track by at least twice times.