利用前端高速ADC来覆盖给定的监视带宽, 在粗略估计载频并考虑一定的保护带, 利用带通信号的均匀欠采样定理行内插抽取, 以获得欠采样后的信号。-Using high-speed ADC front-end to cover a given monitor bandwidth, carrier frequency at a rough estimate and considering some of the protection zone, use less uniform bandpass sa