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    • 1. 发明申请
    • METHODS AND SYSTEMS FOR REDUCING INTERFERENCE CAUSED BY ANTENNA LEAKAGE SIGNALS
    • 降低由天线泄漏信号引起的干扰的方法和系统
    • US20090096663A1
    • 2009-04-16
    • US11462907
    • 2006-08-07
    • Steven H. ThomasGlen B. BackesTimothy J. Reilly
    • Steven H. ThomasGlen B. BackesTimothy J. Reilly
    • G01S13/08G01S13/12
    • G01S7/34G01S13/882
    • In one aspect, a method of radar altimeter operation including a time dependent gain control is described. The method comprises triggering a Sensitivity Time Control (STC) gain control signal at a pulse repetition frequency (PRF) of a transmit pulse to attenuate interference from at least one of an antenna leakage signal 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, 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 to the pulse width of a transmitted pulse.
    • 在一个方面,描述了包括时间相关增益控制的雷达高度计操作的方法。 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,以衰减来自天线泄漏信号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之前的第一时间将STC增益控制信号从发射机发送发送脉冲时的稳定的最大衰减变成在第二时间没有衰减的STC增益控制信号, 发送器发送发送脉冲。 该方法还包括将中频(IF)放大器的带宽与发送脉冲的脉冲宽度进行匹配。
    • 3. 发明授权
    • Methods and systems for reducing interference caused by antenna leakage signals
    • 降低由天线泄漏信号引起的干扰的方法和系统
    • US07576683B2
    • 2009-08-18
    • US11462907
    • 2006-08-07
    • Steven H. ThomasGlen B. BackesTimothy J. Reilly
    • Steven H. ThomasGlen B. BackesTimothy J. Reilly
    • G01S13/94G01S13/10G01S7/34G01S7/28
    • G01S7/34G01S13/882
    • In one aspect, a method of radar altimeter operation including a time dependent gain control is described. The method comprises triggering a Sensitivity Time Control (STC) gain control signal at a pulse repetition frequency (PRF) of a transmit pulse to attenuate interference from at least one of an antenna leakage signal 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, 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 to the pulse width of a transmitted pulse.
    • 在一个方面,描述了包括时间相关增益控制的雷达高度计操作的方法。 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,以衰减来自天线泄漏信号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之前的第一时间将STC增益控制信号从发射机发送发送脉冲时的稳定的最大衰减变成在第二时间没有衰减的STC增益控制信号, 发送器发送发送脉冲。 该方法还包括将中频(IF)放大器的带宽与发送脉冲的脉冲宽度进行匹配。
    • 10. 发明申请
    • FREQUENCY HOPPING OSCILLATOR CIRCUIT
    • 频率振荡振荡器电路
    • US20070296510A1
    • 2007-12-27
    • US11423573
    • 2006-06-12
    • Glen B. Backes
    • Glen B. Backes
    • H03L7/00
    • H03L7/18
    • A method for controlling a frequency output of a phase locked loop (PLL) is provided. The method includes providing digital control words to the PLL to discretely change at least one dividing factor within the PLL. The method further includes applying a time-varying control voltage to a voltage controlled oscillator. The method still further includes applying an output of the voltage controlled oscillator to the PLL as a reference frequency. The method further includes outputting a signal from the PLL, the signal varied in frequency based on one or more of the time-varying control voltage and the at least one dividing factor.
    • 提供了一种用于控制锁相环(PLL)的频率输出的方法。 该方法包括向PLL提供数字控制字以离散地改变PLL内的至少一个分频因子。 该方法还包括将时变控制电压施加到压控振荡器。 该方法还包括将压控振荡器的输出施加到PLL作为参考频率。 该方法还包括从PLL输出信号,该信号基于时变控制电压和至少一个分频因子中的一个或多个频率而变化。