Nowadays, one of the most significant signal carriers, the radio wave of high frequency propagates in multi-hop path. We establish the foundation model of Sky-wave reflection in order to study the relationship between some factors (signal intensity, SNR (Signal to Noise Ratio), etc.) and propagating distance, and solve out the optimal multi-hop path. We assume that the value of projecting power of radio wave, the distance between radio wave source and receiver and times of hop are known and we establish the basic model of the calm ocean to determine the signal intensity and SNR at the target location.
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