【摘要】 提出了一种基于相控阵天线的AOA与RSSI相结合的混合定位方法。针对不同的天线单元数N、天线单元间距d、天线单元相位差α,定量分析了相控阵天线的辐射特性参数;此外,定量分析了N对功率和信噪比(SNR)的影响。分析表明当N为15、d取0.45λ时,在整个扫描范围内波束宽度Δθ1/2小于30°;同时工作距离提高15倍,SNR提高10log(15)d B。最终实测证明,基于相控阵天线的RFID定位系统不仅增大了工作范围,也改善了系统抗干扰能力。更多还原

【Abstract】 Basing on the phased array antenna,a hybrid location method which combines the AOA and the RSSI is proposed. For the different antenna unit number N,antenna unit spacing d and the phase difference α between the antenna units,the radiation characteristic parameters of the phased array antenna are calculated,analyzed and discussed. Also,the effect of the antenna unit number to the power and the SNR is analyzed. The analysis conclusion is that the beam width Δθ1 /2at the whole scanning coverage can be less than 30°when N is 15 and d is 0. 45λ,meanwhile the identification distance can be improved to 15 times and SNR to 10log( 15) dB. The RFID positioning system with the phased array antenna not only expands the working range but also improves the anti-jamming capability,which is proved by experiments.更多还原