Saving and restoring the value of errno in the signal handler, as follows, can resolve the problem

如下，在信号处理器内保存和恢复 errno 的值，可以解决这一问题

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Theory and simulation results have proved and certificated that this method is able to excellently resolve the coherent signal sources of lower ratio of signal and noise.

理论与模拟结果证明这种方法可以实现低信噪比、相干信号源的良好分辨。

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It tracks the frequency automatically to resolve the dropout of signal and to restrain all kinds of noises and disturbances.

采用频率自动跟踪技术来解决信号丢失问题，抑制了各种噪声和干扰。

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