摘要
大气的折射效应引起电波传播延迟和路径弯曲。目前常见的电波折射经验模型只考虑了时延误差，而对于低仰角（5°以下）目标，弯曲误差的影响是不能忽略的，为进一步提高对目标的定位精度，以某沿海地区为例，利用1986-1995年的历史气象探空数据建立了适合不同仰角的电波折射修正经验模型，并拟合得到了模型中的参数。统计分析表明，经验模型与射线描迹法计算的折射误差具有很好的一致性。
Atmospheric refraction causes time delay and path bending of the radio wave propagation, and the time delay is usually considered in the existing empirical models for the refractive error correction, when the elevation angle is below 5°, the bending error can not be neglected. In order to improve the positioning precision, based on the historical radiosonde data from 1986 to 1995 in a coastal area, a new empirical refraction correction method is proposed, which can be used for both high and low elevation angles, the refractive errors obtained with this method are compared with ones obtained by ray tracing method and historical radiosonde data, The compared results show that the refractive error obtained by two method have good agreement.
出处
《电波科学学报》
EI
CSCD
北大核心
2008年第3期580-584,共5页
Chinese Journal of Radio Science
关键词
折射误差修正
射线描迹
时延误差
弯曲误差
refractive error correction
delay error
bending error
ray tracing
