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    • 2. 发明公开
    • DISTANCE MEASUREMENT METHOD AND DEVICE
    • 爱沙尼亚 -
    • EP1512987A1
    • 2005-03-09
    • EP03736015.3
    • 2003-06-04
    • SHIMA SEIKI MANUFACTURING, LTD.
    • UEBO, Tetsuji SHIMA SEIKI MANUFACTURING LIMITEDIRITANI, Tadamitsu
    • G01S13/40
    • G01S13/887G01S13/32
    • A distance can be measured with high resolution. A frequency controller (7) controls a voltage control oscillator (2) so as to change a signal source frequency f in a range containing two center frequencies f1 and f2 and transmits it as a traveling wave from an antenna (4) to a target (5). A reflected wave reflected by the target (5) and the traveling wave interfere each other and form a standing wave. A power detector (6) detects power corresponding to the amplitude of the standing wave and performs Fourier transform based on the two center frequencies f1 and f2 in Fourier transform means (11, 12), respectively, thereby calculating radar image functions P1(x), P2(x). The distance d to the target (5) satisfies the conditions that the phase difference of the two radar image functions zero-crosses and the amplitude of the radar image functions becomes maximum. The zero cross point of the phase difference is a zero cross point of a linear function and can be identified with high resolution.
    • 可以用高分辨率测量距离。 频率控制器(7)控制压控振荡器(2),以便在包含两个中心频率f1和f2的范围内改变信号源频率f,并将其作为行波从天线(4)发送到目标( 5)。 由目标(5)反射的反射波和行波相互干涉并形成驻波。 功率检测器(6)检测与驻波振幅相对应的功率,分别在傅里叶变换装置(11,12)中基于两个中心频率f1和f2进行傅里叶变换,由此计算雷达图像功能P1(x) ,P2(x)。 目标(5)的距离d满足两个雷达图像功能的相位差为零,雷达图像功能的幅度变为最大的条件。 相位差的零交叉点是线性函数的零交叉点,可以用高分辨率来识别。