基于FPGA的DBF多波束中频接收系统的设计与实现

Design and Implementation of DBF Multi Beam IF Receiving System Based on FPGA

摘要:

数字波束形成(DBF)阵列能够充分利用阵列天线所获取的空间信息,通过信号处理技术使波束获得超分辨率和低旁瓣的性能,它由天线阵元、射频下变频模块、AD采样、中频接收系统及上位机控制器组成;对中频接收系统进行数字波束形成的具体方案进行讨论,对多路接收和AD量化一致性造成的各通道间失配提出了幅相校正的解决方案,详细分析了研制中的关键技术;实验结果表明所设计的DBF多波束中频接收系统可有效实现通道间失配的校正,并实现精确的波束赋形功能。

Abstract:

A DBF array can make full use of the spatial information obtained by the array antenna, and the super resolution and low sidelobe performance of the beam can be obtained by using the signal processing technique. It consists of antenna elements, RF down-converter, AD sampling, IF receiving system and PC controller. focusing on the specific scheme of digital beam forming for IF receiving system, a solution of amplitude and phase correction is proposed for each channel mismatch caused by multi channel reception and AD quantization consistency. In this paper, the key technologies during the development is analyzed. The experimental results show that the design of the DBF multi beam IF receiving system can effectively realize the correction of the channel mismatch, and realize the accurate beam forming function.