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    • 9. 发明授权
    • Spacecraft communication channel power control system
    • 航天通信通道功率控制系统
    • US5828335A
    • 1998-10-27
    • US554131
    • 1995-11-06
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HersheyGary Jude Saulnier
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HersheyGary Jude Saulnier
    • H04B7/185
    • H04B7/18543
    • A control system for the uplink transmitter of a ground station communicating with a spacecraft includes an antenna located at the ground station, pointed toward the spacecraft for receiving downlink signals transmitted therefrom. The received signals are accompanied by noise attributable to ambient, sky and ground temperatures. A low-noise receiver is coupled to the output port of the antenna, for establishing the receiver noise temperature. A processor is coupled to the low-noise receiver apparatus and to the power control input port of the uplink transmitter, for responding to changes in the received noise power attributable to the presence or absence of precipitation in the downlink. The processor does this by producing an estimate of the attenuation attributable to the rain in the downlink, and generates the control signal in response to the estimate of the attenuation. The control signal increases the signal power of the uplink transmitter in response to increases in the estimate of the rain attenuation, and decreases the signal power of the uplink transmitter in response to decreases in the estimate of the rain attenuation. The processor determines the downlink rain attenuation L.sub.a,D by L.sub.a,D f(.DELTA.N.sub.R)=T.sub.eff /(1+T.sub.eff -.DELTA.N.sub.R) where T.sub.eff =(T.sub.amb -T.sub.sky)/(T.sub.LNA +T.sub.g +T.sub.sky)
    • 用于与航天器通信的地面站的上行链路发射机的控制系统包括位于地面站的天线,指向航天器,用于接收从其发射的下行链路信号。 收到的信号伴随着环境,天空和地面温度的噪音。 低噪声接收器耦合到天线的输出端口,用于建立接收机噪声温度。 处理器耦合到低噪声接收机设备和上行链路发射机的功率控制输入端口,以响应归因于下行链路中是否存在降水的接收噪声功率的变化。 处理器通过产生归因于下行链路中的雨的衰减的估计来做到这一点,并且响应于衰减的估计而产生控制信号。 控制信号响应于雨衰的估计的增加而增加上行链路发射机的信号功率,并且响应于雨衰的估计的减小而降低上行链路发射机的信号功率。 处理器确定下行链路衰减衰减La,D byLa,D + Z f(DELTA NR)= Teff /(1 + Teff-DELTA NR)其中Teff =(Tamb-Tsky)/(TLNA + Tg + Tsky)
    • 10. 发明授权
    • Method and apparatus for filtering digital television signals
    • 数字电视信号滤波方法和装置
    • US6122015A
    • 2000-09-19
    • US206409
    • 1998-12-07
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HersheyNick Andrew Van StralenRichard Louis FreyMark Lewis Grabb
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HersheyNick Andrew Van StralenRichard Louis FreyMark Lewis Grabb
    • H04N5/21H04N5/213
    • H04N5/211Y10S348/914
    • A system for filtering digital television signals is provided. The system comprises a generator for providing a first data sequence to a private data packetizer, and a transmitter for transmitting the packetized first data sequence in a data channel of a digital television signal. The system further includes a receiver for receiving the digital television signal and recovering the first data sequence. The receiver includes a channel estimator for providing an estimate of channel characteristics, such as estimated channel impulse estimate and estimated noise variance. The receiver further includes an adaptive equalizer filter having an input for receiving the digital television signal and an input for receiving adaptive filter coefficients. The receiver further includes a coefficient processor for calculating adaptive filter coefficients based on the channel estimate, and providing the adaptive filter coefficients to the adaptive equalizer filter. The digital television signal is thus filtered to remove undesired channel effects.
    • 提供了一种用于过滤数字电视信号的系统。 该系统包括用于向专用数据分组器提供第一数据序列的发生器和用于在数字电视信号的数据信道中发送分组化的第一数据序列的发射机。 该系统还包括用于接收数字电视信号并恢复第一数据序列的接收机。 接收机包括用于提供信道特性的估计的信道估计器,例如估计的信道脉冲估计和估计的噪声方差。 接收机还包括具有用于接收数字电视信号的输入端和用于接收自适应滤波器系数的输入端的自适应均衡器滤波器。 接收机还包括系数处理器,用于基于信道估计来计算自适应滤波器系数,并将自适应滤波器系数提供给自适应均衡器滤波器。 因此数字电视信号被滤波以去除不需要的信道效应。