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    • 1. 发明公开
    • Methods and systems for reducing interference caused by antenna leakage signals
    • Verfahren und System zur Reduktion von Interferenz durch Antennenlecksignale
    • EP1887380A1
    • 2008-02-13
    • EP07113820.0
    • 2007-08-03
    • Honeywell International Inc.
    • Thomas, Steven H. c/o Honeywell International Inc.Backes, Glen B.Reilly, Timothy J.
    • G01S7/34
    • G01S7/34G01S13/882
    • In one aspect, a method of radar altimeter (10) operation including a time dependent gain control is described. The method comprises triggering a Sensitivity Time Control (STC) gain control signal (180) at a pulse repetition frequency (PRF) of a transmit pulse to attenuate interference from at least one of an antenna leakage signal (34) and a signal reflected from equipment. The method also includes shaping the STC gain control signal from no attenuation at a first time, before a transmitter sends the transmit pulse (18,100,183,200), to a stable maximum attenuation at the time the transmitter sends the transmit pulse, to no attenuation at a second time, after the transmitter sends the transmit pulse. The method also includes matching a bandwidth of an intermediate frequency (IF) amplifier (178,186) to the pulse width of a transmitted pulse.
    • 一方面,描述了包括时间相关增益控制的雷达高度计(10)操作的方法。 该方法包括以发射脉冲的脉冲重复频率(PRF)触发灵敏度时间控制(STC)增益控制信号(180),以衰减来自天线泄漏信号(34)和从设备反射的信号中的至少一个的干扰 。 该方法还包括在发射机发送发射脉冲(18,100,183,200)之前,在发射机发送发射脉冲之前的稳定的最大衰减时,在第一时间没有衰减的STC增益控制信号成形,在第二时间没有衰减 时间后,发送器发送发送脉冲。 该方法还包括将中频(IF)放大器(178,186)的带宽与发射脉冲的脉冲宽度进行匹配。