摘要
在电子对抗领域中,雷达信号的信息是信号分选、威胁识别、引导干扰的重要参数.与传统的模拟接收技术相比,数字接收机具有高分辨率、高可靠性、抗干扰能力强、灵活可变等许多优点.宽带、大动态范围、高灵敏度的数字接收机在电子对抗领域中有着广泛的应用前景.根据中频采样和数字下变频的基本原理,介绍了一种双通道中频数字接收机的硬件设计与实现方案.模拟信号经高速A/D采样后直接由FPGA进行信号处理.结果表明,系统具有成本低、精度高、结构简单等优良性能,可以满足实际需要.
In the domain of ECM, the information of radar signals is an important parameter for signal choosing, menace recognizing and guidance ECM. Comparing with traditional analogue counterparts, digital receivers are of better resolution, reliability, anti-jamming and agility. Digital receivers with wide bandwidth, high dynamic range and sensibility are widely used in ECM. This paper demonstrates a hardware design and realization of the double-channel intermediate frequency（IF） digital receiver based on the theory of direct IF sampling and digital down-conversion. After the high speed A/D sampling, the analog signals were processed by the FPGA directly. The result shows that the system has fine performance such as lower cost, higher precision and simpler structure, and it can meet the actual demands.
出处
《应用科技》
CAS
2009年第3期26-30,共5页
Applied Science and Technology
关键词
数字接收机
高速采样
中频
FPGA
digital receiver
high speed sampling
intermediate frequency
FPGA
