低仰角对流层折射修正快速算法

大气的折射效应引起电波传播延迟和路径弯曲,测量数据对流层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。研究设计了一种能够应用于实时数据处理快速有效的对流层折射修正迭代算法。经大量外场实测数据验证,该算法能够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。

A Fast and Efficient Algorithm of Tropospheric Refraction Correction at Low Elevation

Since the effect of atmospheric refraction leads to radiowave propagation delay and path bending,the accuracy of tropospheric radiowave refractive error correction of the detected data directly influences orbit determination accuracy of flighting targets.In consideration of low precision or low efficiency of the tropospheric refraction correction,especially the big error of traditional correction methods for correcting the data of low elevation below 5？,the real-time tropospheric refraction correction for the detected data isn＇t often adopted.It brings great impact to the accuracy of real-time orbit determination.A new fast and efficient iterative algorithm for tropospheric refraction correction is designed and studied,which can be applied to real-time data processing.Experimental results based on mass quantities of measured data in outfield verify the validity and effectiveness of this method in eliminating tropospheric refractive error at low elevation.Meanwhile,a better correction precision can be obtained at high elevation.