一种中频数字化接收机中的数字信号处理技术

Digital Signal Processing Used in Digitize Intermediate Frequency Receiver

数字化接收机的硬件结构和功能相对独立,这样就可以基于相对通用的硬件平台,通过软件编程对中频频率、系统频带、调制方式等进行设置,最终实现灵活的多功能、多体制通信接收机。通过对软件升级可以不断扩展和完善接收机的功能。本文系统阐述了中频数字化接收机中的数字信号处理技术。首先从模拟通道入手,介绍了超外差式模拟通道组织方案。接下来重点论述了带通采样理论、数字下变频技术、基带数字解调技术、自动增益控制(AGC)原理。

The hardware architecture and function of digital IF receiver are relatively independent from each other. By using software, it is very convenient to set and adjust work parameters of receiver such as intermediate frequency,bandwidth and demodulation method with a universal hardware platform. Digital IF receiver is capable of implementing multi-function and multi-communication receiving by loading different software. By means of upgrading software, the functions of receiver can be expanding and improving continuously. The Digital Signal Processing Technique used in digital IF receiver are introduced systematically in this paper. Organization scheme of super-heterodyne analog channel is discussed before all. Emphasis is laid on band-pass sampling,digital down converting, digital demodulation technology, principles of automatic gain control.