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    • 4. 发明申请
    • DETERMINATION OF TERMINAL LOCATION IN A RADIO SYSTEM
    • 无线电系统中终端位置的确定
    • WO1998019488A1
    • 1998-05-07
    • PCT/FI1997000654
    • 1997-10-27
    • NOKIA TELECOMMUNICATIONS OYKALLIOJÄRVI, Kari
    • NOKIA TELECOMMUNICATIONS OY
    • H04Q07/38
    • H04W64/00G01S3/46G01S5/04G01S5/10
    • A radio signal travels over a radio channel in the form of multipath propagation, whereby a signal received by the base station and transmitted by the terminal equipment is composed of multipath components propagated over different distances and thus reaching the receiver at different times. Thus, the information required for computing the bearing of the received signal can be extracted from the arrival time differences of the multipath propagated signal. An antenna array formed by a plurality of antenna elements receives first the multipath propagated signal. Next, means (41, ..., 4N) for determination of channel impulse response form an estimate of the radio channel impulse response from the received signal of each antenna array element, after which correlation means (46) correlate each channel impulse response estimate with a reference estimate selected from the group of said channel impulse response estimates. Further, said means choose as the time difference of the received signal that delay value giving the maximum correlation. Finally, computational means (46) estimate the bearing of the radio signal transmitted by the terminal equipment from the arrival time differences thus determined. Using a two-dimensional antenna array, both the bearing sector and elevation of the received signal can be estimated.
    • 无线电信号以多径传播的形式在无线电信道上传播,由此基站接收并由终端设备发送的信号由在不同距离上传播并因此在不同时间到达接收机的多径分量组成。 因此,可以从多径传播信号的到达时间差中提取计算接收信号的方位所需的信息。 由多个天线元件形成的天线阵列首先接收多径传播信号。 接下来,用于确定信道脉冲响应的装置(41,...,4N)形成来自每个天线阵列元件的接收信号的无线电信道脉冲响应的估计,之后相关装置(46)将每个信道脉冲响应估计 具有从所述信道脉冲响应估计的组中选择的参考估计。 此外,所述装置选择作为给出最大相关性的延迟值的接收信号的时间差。 最后,计算装置(46)从如此确定的到达时间差估计由终端设备发送的无线电信号的方位。 使用二维天线阵列,可以估计接收信号的轴承扇区和高程。