Abstract Digital array radar has become the primary developing trend of radar area because of its programmability and strong applicability。 And the formation of digital beam is the major technology of fodigital array radar for its low power consumption, high stability and high accuracy。 And it enables the beam to obtain a performance of super-resolution and low sidelobe  to achieve the beam scanning, target tracking and Nulling spatial interference signal, so it is necessary to do research on transmit digital beam forming。 The generation and implementation of multi-channel intermediate frequency signal is one of the key technology in digital array radar transmit digital beamforming。

This paper mainly focuses on the  technology of  transmit beam-forming , and emphases on the principle of forming method of multi-beam 。 On the  platform of  transmit beam-forming ,we study the 16-channel transmit digital beam-forming board。 The forming of hardware platform and the composition of its core FPGA  are elaborated , and we made observation and study on some important designs on the hardware platform。 On hardware platform for transmit digital beamforming, and the 16-channel intermediate frequency chirp signal is generated, and its performance was tested and analyzed。Finally, the paper studies the error correction on magnitude and phase for beamforming array unit channel error and make simple measurements on magnitude and phase differences between channels。

Keywords DAR DBF FPGA  magnitude and phase correction 

目   次

1  绪论 1

1。1 论文研究背景 1

1。2研究历史及现状 1

1。3论文的主要工作及内容安排 2

2  数字阵列雷达及发射波束形成 4

2。1  数字阵列雷达 4

2。2  发射数字波束原理 4

   2。2。1  线阵阵列模型 4

   2。2。2  常规波束形成 6

   2。2。3  波束宽度 8

   2。2。4  波束栅瓣的位置 8

   2。2。5  波束副瓣的位置及副瓣电平 9

   2。2。6  波束零点位置 9

2。3  发射多波束形成 10

   2。3。1  发射多波束形成方法 10

   2。3。2  常规发射多波束形成原理 10

3  FPGA及硬件系统的设计 13

3。1  FPGA简介 13

   3。1。1  FPGA的构成 13

   3。1。2  本文所选用的FPGA芯片 13

3。2  硬件系统的组成 13

3。3  系统主要电路设计的研究 15

   3。3。1  时钟电路 15

   3。3。2 电源设计 17

   3。3。3  DAC电路及中频驱动电路 18

4  16通道中频信号的产生及FPGA实现 21