The target echo of passive radar based on FM signal has the characteristics of low SCR and narrowband. Only the receiver with large dynamic range can receive the weak echo signal.
Narrowband intermediate frequency digital receiver has been widely used in radar EW reconnaissance. At present, the high speed signal processing is the key point of its researching.
窄带中频数字接收机在雷达对抗侦察中得到了广泛应用，其高速信号处理技术是目前研究的重点。
3
As receiving the wide band radar signals by a wide band digital receiver, it has great probability of receiving the narrowband radar signals at the same time.