摘要
针对NLOS(非视距)环境下高精度定位,给出了基于OFDM(正交频分复用)信号的无线电定位方法,利用现有的并非专门为定位设计的无线电信号进行定位。建立了OFDM无线电定位模型,分析了OFDM信号结构,给出了基于TDOA(波达时间差)定位方法。采用特征相关法进行符号边界、采样序列和符号序列偏移计算,通过仿真验证了本文方法的有效性,尤其是均值特征相关法在信噪比为-5dB时也可获得精确的TDOA测量。
In order to achieve the high precision positioning in NLOS situation, the radiometric positioning method based on OFDM signals was presented, which uses the exiting radio frequency signals that were not intended for positioning to realize positioning. The radiometrie positioning model using OFDM was established. The OFDM signals structures were analyzed. The TDOA （Time Difference of Arrival） positioning method was given. The symbol boundaries, sampling index and symbol index shift were calculated using feature correlation. The simulation results show that the approach is effective, and especially that the feature correlation using mean can achieve accurate TDOA measurement for SNR of -5 dB.
出处
《无线电工程》
2010年第3期30-32,54,共4页
Radio Engineering
基金
教育部博士点基金项目(20070287007)
南京航空航天大学引进人才基金(4015-908331)
