跨越长江口宽水域的精密高程测量方法

PRECISE HEIGHT MEASUREMENT ACROSS THE BROADESTUARY OP YANGTSE RIVER

本文介绍了跨越长江口6.5km和9.3km两处宽水域精密高程测量方法。为了克服宽水域跨河高程测量所遇到的困难，使用了精密量高系统，发散角极小的可调光照准标志，并对削弱大气折射误差对跨河观测成果的影响提出一些有效的措施。观测结果达到预期目的，测回合格率在96％以上，最后成果精度满足了用一等水准精度指标设置的跨河高程测量所有的限差要求。

: The method for precise height measurement across the estuary of Yangtse River with sight lines 6.5km and 9.3km in length is introduced in this paper. In order to overcome difficulties encountered in crossing the broad estuary, precise height measure-ment system and adjustable sighting mark with minimum divering angle are used. Eff ective measures are also adoped to minimize the effect of refraction on the results of heighting acress the estuary. The results of height measurements reached the expected level. More thah 96% of the measurements sets are up to the standard. The accuracy of final results is within the tolerance of river crossing height measurement established according to the specification of 1st-order leveling.