Large HF bearing errors for propagation paths tangential to auroral oval
Large HF bearing errors for propagation paths tangential to auroral oval
复制标题
与极光椭圆形相切的传播路径存在较大的高频方位误差
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
T. Jones
中科院分区：
文献类型：
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作者：
N. Rogers;E. M. Warrington;T. Jones
与中纬度槽壁相关的电离层中的大电子密度梯度会产生倾斜的反射面，从而导致高频信号在远离大圆的路径上传播。给出了沿中纬度槽的两条路径上传播的信号的测量结果，在这两条路径上，经常记录到方位偏离大圆路径达100°，即预期到达方向。这些大偏差的出现次数和大小与中纬度电离层槽的已知特征是一致的。测量的轴承与大圆轨迹的偏差如此之大，远远超过了仪器误差，这对在高频波段内运行的定位系统产生了严重的影响。
Large electron density gradients in the ionosphere associated with the walls of the midlatitude trough produce tilted reflecting surfaces which lead to HF signals propagating over paths well displaced from the great circle. Measurements are presented of signals propagating over two paths along the midlatitude trough for which bearings deviations of up to 100° from the great-circle path, i.e. the expected direction of arrival, were frequently recorded. The times of occurrence and magnitude of these large deviations are consistent with the known features of the midlatitude ionospheric trough. Such large deviations of the measured bearing from the great-circle path, which far exceed the instrumental errors, have serious implications for the operation of position location systems operating within the HF band.