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    • 4. 发明申请
    • Frequency Modulated Continuous Wave (Fmcw) Radar Having Improved Frequency Linearity
    • 调频连续波(Fmcw)雷达具有改善的频率线性
    • US20080088503A1
    • 2008-04-17
    • US11662363
    • 2005-09-21
    • Patrick Beasley
    • Patrick Beasley
    • G01S13/00G01S13/04
    • G01S7/4056G01S13/343
    • A frequency modulated continuous wave (FMCW) radar is described that comprises a frequency sweep generator (42) for producing a swept frequency signal. A discriminator (52) receives a portion of the swept frequency signal and produces a reference difference-frequency signal. The discriminator 52 comprises an optical delay means, which may comprises a laser diode (72), an optical fibre (74) and a detector (76) for producing a time displaced frequency swept signal from which the difference-frequency signal is derived. A transceiver (50) is also described that generates the signal to be transmitted by the radar from the swept frequency signal and produces a target difference-frequency signal. An analogue-to-digital converter (80) samples the target difference-frequency signal at a rate derived from the frequency of the reference difference-frequency signal. Use of the radar in various applications, such as detecting foreign object debris on airport runways and perimeter security, are also described.
    • 描述了一种频率调制连续波(FMCW)雷达,其包括用于产生扫频信号的频率扫描发生器(42)。 鉴频器(52)接收扫频信号的一部分并产生参考差频信号。 鉴别器52包括光学延迟装置,其可以包括激光二极管(72),光纤(74)和检测器(76),用于产生从其导出差分频率信号的时间偏移频率扫描信号。 还描述了收发器(50),其从扫频信号产生由雷达发射的信号,并产生目标差频信号。 模拟 - 数字转换器(80)以基准差频信号的频率所得的速率对目标差频信号进行采样。 还描述了在各种应用中使用雷达,例如检测机场跑道上的异物碎片和周边安全。