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大气折射效应引起电波传播延迟和路径弯曲,测量数据对流层折射修正的精度直接影响到飞行目标轨(弹)道确定的精度。考虑到对流层折射修正的精度和效率以及5°以下低仰角数据传统修正方法具有较大的误差,通常不对测量数据进行实时对流层折射修正,这使得实时定位的精度受到较大影响。文中提出了一种基于光电传播几何路径迭代的对流层折射修正新方法,解决了修正精度和实时性不能兼顾的问题。经大量无人机校飞和载人航天工程外场实测数据验证,该算法能够实时有效地消除低仰角对流层折射偏差,对高仰角测量数据的对流层折射修正亦具有较高的精度。
Atmospheric refraction causes propagation delays and path warps, and the accuracy of tropospheric refraction measurements directly affects the accuracy of the target trajectory (trajectory) of the flight. Considering the accuracy and efficiency of tropospheric refraction correction and the large error of the traditional correction method for low elevation data below 5 °, real-time tropospheric refraction correction is not usually performed on the measured data, which makes the accuracy of real-time positioning greatly affected. In this paper, a new method of tropospheric refraction correction based on the iteration of photoelectric path geometry is proposed, which solves the problem that the correction accuracy and the real-time performance can not be reconsidered. The results of large numbers of UAS schools and manned aerospace engineering field data show that this algorithm can effectively eliminate the low-elevation tropospheric refraction bias in real time and correct the tropospheric refraction of high-elevation survey data.