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    • 10. 发明授权
    • Dual frequency distance measuring system
    • 双频测距系统
    • US4283726A
    • 1981-08-11
    • US939810
    • 1978-09-05
    • Lewis C. SpenceStephen Martin
    • Lewis C. SpenceStephen Martin
    • G01S5/14G01S11/08G01S19/48G01S5/06
    • G01S5/14G01S11/08
    • A radio frequency distance measuring system and method where two continuous wave carrier signals, derived from a stable frequency source, are radiated from a known reference point. The frequency of the first continuous wave carrier signal is displaced from the frequency of the second continuous wave carrier signal by a selected difference frequency. When received at the unknown point, the two continuous wave carrier signals are mixed to provide a difference or beat frequency marker signal, delayed in arrival at the unknown point from the known point by the speed of light. A locally generated marker signal is derived from a stable frequency source at the unknown point, and has the same frequency as the difference frequency signal. The leading or trailing edge of the difference frequency signal can be compared with the locally generated marker signal, and the time difference or phase difference between them can be displayed using a phase meter or time interval indicator and corresponds to determine directly the distance between the known transmitter reference point and the unknown receiver point. Multiple known reference point transmitters, each transmitting two continuous wave carrier signals displaced in frequency by a selected difference frequency, can be used to obtain two or more distance measurements at the unknown point to determine the position of the unknown receive point with respect to the known transmitter points. A chart shows the relationship of the selected difference frequency to the distance that can be measured without ambiguity.
    • 一种射频距离测量系统和方法,其中从稳定频率源导出的两个连续波载波信号从已知参考点辐射。 第一连续波载波信号的频率从第二连续波载波信号的频率偏移选定的差频。 当在未知点被接收时,将两个连续的波载波信号混合以提供差分或拍频信号,从已知点以光速延迟到达未知点。 本地产生的标记信号从未知点的稳定频率源导出,并且具有与差分频率信号相同的频率。 可以将差频信号的前沿或后沿与本地产生的标记信号进行比较,并且可以使用相位计或时间间隔指示器显示它们之间的时间差或相位差,并且对应于直接确定已知的 发射机参考点和未知接收点。 可以使用多个已知的参考点发射机,每个发射机在频率上以选定的差频率发射两个连续波载波信号,以在未知点获得两个或更多的距离测量值,以确定未知接收点相对于已知的位置 发射点。 图表显示所选择的差异频率与可以测量的距离之间的关系,不明确。