精密单点确定航空重力载体运动速度和加速度

Determination of Precise Absolute Velocity and Acceleration Airborne Gravimetry

载体运动速度和加速度的精确确定是航空重力中的关键问题之一。基于IGS发布的精密轨道和钟差产品,并对各种相关误差精确模型化,利用载波相位直接法计算速度和加速度。在静态条件下,水平方向的速度精度优于1.5mm/s,加速度精度优于2.0mm/s^2;垂直方向的速度精度约为2.0mm/s,加速度精度约为2.5mm/s^2。在动态条件下,与多参考站载波相位直接法精度相当,并且计算效率和解算成功率更高。结果表明了本文方法在航空重力中的有效性。

Precise velocity and acceleration is one of the key problems in airborne gravimetry. In this paper, a carrier phase-based velocity and acceleration determination method with precise orbit and clock products is introduced. In static case, the horizontal velocity and acceleration are better than 1.5 mm/s and 2.0 mm/s^2 , respectively, and the vertical ones are about 2.0 mm/s and 2.5 mm/s. In kine- matic case, this method is comparable with the multi-reference stations method in precision, and has a higher computational efficiency and success rates. Meanwhile, the sampling rate of precise clock prod- ucts only influences the velocity, and the order is lower than 1 mm/s. It turns out that the method presented here is effective in airborne gravimetry.