多方位—初距法是潜艇解算目标运动要素的常用方法之一,所提供的估计初始距离的准确程序直接影响解算的可信度.为了及时评判估计初始距离的准确程度,引入方位偏差的概念,作为潜艇指挥员修正估计初始距离的重要依据.方位偏差是利用部分方位序列解算目标运动要素,根据解算结果推算当前目标方位,与当前实测目标方位相比较的结果.利用估计初始距离与真实初始距离差异性反映到方位偏差的变化规律,可以迅速有效地调整估计初始距离,使解算过程快速收敛到理想解.%The method of many bearings and one initial distance is commonly used to calculate objcet moving element, and the accuracy of the provided initial distance has adirectimpaton the reliability of calculating directly. In order to estimate the accuracy of the initial distance in time,the concept of bearing delta is introduced,which acts as the main base of modifying the estimated initial distance for submarine commander. Bearing delta is deduced from real object bearing observed and reckoned object bearing which is calculated from objcet moving element calculating results based on partial object bearings. The rules of bearing delta and the difference between estimated initial distance and real initial distance can be used to quickly and efficiently modify the estimated initial distance and render the calculating process to ideal results.
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