谈谈区域性旁折光

On lateral refraction of regional nature

本文根据全国五万点整体平差资料，利用统计的锁段方位角条件闭合差和三角形图形闭合差等数值特征，结合我国的自然地理特点，进行计算分析。结果表明，我国某些地区的“区域性旁折光”不仅存在，而且相当严重，其影响甚至超过了全球性旁折光。作者认为，旁折光不仅与自然地貌有关，而且与观测边长也存在着微妙的关系。为减少旁折光的影响，本文提出了相应的措施。

: In the adjustment of astrogeodetic network of China,the total num- ber of triangulation stations of primary, secondary and tertiary classes and trave- rse stations entering in the simultaneous adjusment is about 50000, based on the characteristics of the closures of azimuth conditions and those of triangles of this immense astrogeodetic network along with the geographical features of china, an analysis for lateral refraction has been made. The results indicate that there exist- serious lateral refractions in some regions and their effects even surpass global re- fraction. It is believed lateral refraction not only depends on natural landforms, but bears subtle with side length. Suitable measures taken to reduce the effect of lateral refraction are suggested.