无人直升机多天线通信信道建模及性能分析

在单天线航空信道模型的基础上,提出了一种无人直升机多天线通信信道的统计模型.分析了信道的时延扩展、多普勒扩展和角度扩展特性,研究了机身对天线的遮挡效应及多天线信号之间的干涉问题.根据模型特点建立了一种准确有效的仿真模型,给出了延迟功率谱、空间相关性、多普勒功率谱和机身遮挡效应的仿真方法.利用该模型在途中飞行、任务区盘旋和起飞/降落这3种飞行状态下对单天线和多天线信道的误码性能进行了对比仿真分析,验证了差分空时编码在无人直升机多天线通信系统中的良好性能.该模型可用于无人直升机多天线通信系统的调制和编码技术研究.

Modeling and performance analysis of multiple-antennae communication channel for pilotless helicopter

A statistical channel model for the pilotless helicopter multiple-antennae communication was derived based on the single-antenna aeronautical channel model. Characteristics of delay spread, Doppler spread and angular spread were discussed. Mask effect of fuselage and interference of the multiple-antennae were researched. An effective and accurate simulation model was derived from the proposed model. Simulation methods for delay power spectrum, spatial correlation, Doppler spectrum and mask effect of fuselage were presented respectively. Numerical simulations of single-antenna and multiple-antenna channel were carried out under three flying conditions: reroute, circled, taking off and landing. Good performance of differential space-time code was confirmed through simulation. The model is useful for the modulation/coding design of pilotless helicopter multiple-antennae communication system.