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    • 9. 发明申请
    • LINE OF SIGHT SIGNAL DETECTION
    • 信号线检测
    • WO2005040846A1
    • 2005-05-06
    • PCT/IB2004/052175
    • 2004-10-22
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.HUNT, BernardWILCOX, Martin, S.
    • HUNT, BernardWILCOX, Martin, S.
    • G01S5/02
    • G01S11/08G01S5/0215
    • Pulse propagation time between a transmitter station and a receiver is measured at s4 and s6. This can occur by detecting a step increase in signal strength or by correlating a locally generated replica of the pulse signal which was known to have been transmitted with the received signal. The distance between the stations is then measured at step s7. The phase shifts of the 10 transmitted pulse signals are then estimated using the propagation time t, and the difference between the phase shift estimates at this time calculated. The estimated phase difference is then compared with the output of the phase comparator time stamped at time t (step s8). If the phase difference is not substantially as estimated, the received signals are determined not to be suitable line of sight signals for distance determination and a signal indicating this is generated (step s5). If the phase difference is small, the amplitudes of the two pulse signals are compared (step s9), allowing for any known difference in the ERP of the transmitted signals. If the pulse signals are reflected or pass through an intervening obstacle, an attenuation differential will be detected. If the attenuation differential falls outside of an acceptable range, the received signals are determined not to be suitable line of sight signals for distance determination and a signal indicating this is generated (step s5).
    • 在s4和s6测量发射台和接收机之间的脉冲传播时间。 这可以通过检测信号强度的步长增加或通过将已知已经发送的脉冲信号的本地产生的副本与接收的信号相关联来发生。 然后在步骤s7测量站之间的距离。 然后使用传播时间t来估计10个发送的脉冲信号的相移,并且计算此时的相移估计值之间的差。 然后将估计的相位差与在时间t标记的相位比较器时间的输出进行比较(步骤s8)。 如果相位差基本上不是估计的,则确定接收到的信号不是用于距离确定的适合的视线信号,并且产生指示其的信号(步骤s5)。 如果相位差小,则比较两个脉冲信号的幅度(步骤s9),允许发送信号的ERP中的任何已知差异。 如果脉冲信号被反射或穿过中间的障碍物,则会检测到衰减差。 如果衰减差异超出可接受范围,则接收到的信号被确定为不适合用于距离确定的视线信号,并且产生指示该信号的信号(步骤s5)。