基于干扰保护比的同频航向信标台最小保护间距计算

针对航向信标( LOC)台站典型同频场景，提出了最小保护间距的数值计算方法。利用 LOC台站间距离曲线拟合得到满足干扰保护比的保护间距函数，根据几何函数确定LOC台站空间间距，基于保护间距和空间间距的关系确定同频LOC台站的最小保护间距。所提计算方法可在满足干扰保护比的前提下，获得更加精确的同频LOC台站间距，该间距小于美国联邦航空管理局( FAA)规定的相对保守的台站间距，可有效提高LOC系统的频率利用效率。

Interference protection ratio based computation of minimum cochannel localizer station protection distance

A numerical computation method for minimum protection distance is proposed for cochannel localizer(LOC) stations under several typical scenarios.For this proposed method,the function of required protection distance is fitted based on the distance curves between LOC stations,and the space distance curves corresponding to these scenarios are obtained from the geometrical function.The minimum LOC cochannel distance is determined based on the relationship between the required protection distance and the space distance.Compared with the relatively conservative protection distance provided by the Federal Aviation Administration(FAA) regulation,the proposed method can obtain more accurate and smaller LOC cochannel distances under the fundamental premise of safety.Therefore,the frequency utilization efficiency of LOC systems can be improved.