对流层散射传播中的偏移损耗分析

针对对流层超视距无源探测中可能遇到收发天线波束不能对准的情形，该文给出了对流层散射传播偏移损耗的理论计算方法。利用收发天线窄波束的特点，假定高斯型的天线方向性函数，建立了对流层散射传播接收功率中的方位项函数，得到了散射传播偏移损耗理论公式。与文献中的试验数据比较发现：二者具有较好的一致性。另外对收发天线均偏离大圆路径情形下的偏移损耗进行了仿真。此种传播损耗计算方法，可为对流层超视距传播的无源定位与探测系统设计提供参考。

Analysis of Rotational Loss in Troposcatter Propagation

A computational method for the rotational loss in the troposcatter propagation is presented because the beams of transceivers antenna can not be along the circular path in trans-horizon passive detection. Because of the narrow beams of the transceivers in the troposcatter propagation, a Gauss function pattern of the antennas is assumed. An azimuth term is derived from the scatter receiver power and a path loss formula used for the beam rotation is given in this paper. Comparison with the experimental data presented in the literature, the two have good consistency. The rotational loss is simulated for the case that both antennas of the transmitter and receiver are not oriented on the great circle bearings. The proposed method is able to serve as a reference for designing the passive location system and detection system in the troposcatter trans-horizon propagation.