由于卫星通信信道长，传输距离远，电波要穿过对流层和电离层，易使信号衰减，引入噪声，造成误码。
Due to satellite communication's long channel, far distance transmission and its wave through troposphere and ionosphere often brings the signal deamplification, noise and wrong code.
汉明距离可以在通信中累计定长二进制字中发生翻转的错误数据位，所以它也被称为信号距离。
The Hamming distance is used in telecommunication to count the number of flipped bits in a fixed-length binary word, an estimate of error, and so is sometimes called the signal distance.
从模拟信号转向PWM可以极大地延长通信距离。
From the analog signal to PWM can greatly extend the communication distance.
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