The paper put forward to adopt the method that the signals were preamplified and modulated by amplitude modulation, then demodulated by AM in-phase demodulation using PLL.

• 本文提出采用先经前置放大、调幅调制，然后再利用锁相环构成的调幅波同步检波电路解调得到有用信号的方法解决该问题。