轨道FSK信号发送的小函数。这个函数虽然少，但却是在无数可行方案中选的最优，性能最佳的。在这基础上进行信号处理很不错的。-FSK signal sent from the track a small function. This function, though a small, but they are numerous options in the optimal choice, the best performance. In this based on the signal processing is very good.