基于S3C2410的X波段天气雷达综合测试仪设计

【作者】 高飞；

【导师】 邓中亮；

【作者基本信息】 北京邮电大学 ， 电子与通信工程， 2011， 硕士

【摘要】 目前常规数字化天气雷达数量多、分布广,有些地区已经达到雷达探测范围内100km距离圈的相互衔接,这是数字化天气雷达的组网观测和严密监视大范围天气变化的物质基础。数字化天气雷达可以对降水目标进行定量测量和数字处理。虽然技术先进、功能强大,但在使用过程中,随着器件的老化和更换,其技术参数会因种种原因而发生变化。对同样的目标,由于技术参数的改变,导致回波强度有很大差别。不同波长、不同技术状态的天气雷达对于同样的风暴,常会给出相互矛盾的目标强度报告。本研究以嵌入式控制系统为控制核心,重点研究了linux、qt平台的移植、X波段频率合成器、零差拍测频技术、低频调制信号发生器、微波稳幅组件、视频信号解调测量单元、峰值功率测量单位、程控衰减控制单元、中频图示仪等技术,主要研究工作可概括如下：1.在阅读了大量相关文献并研究了目前国内外雷达综合测试仪的基础上,结合用户需求与实际问题完成了x波段天气雷达的整体方案。2.选用以S3C2410嵌入式系统,设计并搭建与之配套的控制电路及数据采集电路,做为系统的控制核心。3.移植了嵌入式系统的uboot、linux2.6.15内核、yafs2文件系统等。4.设计了频率合成器单元,稳幅电路单元、频率测量电路单元、中频图示仪单元、功率测量单元、调制信号单元、人机界面单元等。天气雷达的数量众多,使用环境等各种不确定因素很多,本文的研究成果在实际应用中取得了满意的结果。更多还原

【Abstract】 At present, the conventional digital weather radar, with a large quantity and wide distribution.In some war zone (region), the radar detection range has reached mutual convergence in 100 km distance circle, which is the material basis for digital weather radar group networking observation and for monitor large scope of the weather changes closely. Digital weather radar can carry out quantitative measurement of precipitation target and digital processing. Although the technology is advanced and function is powerful, however, in the using process, with the aging and replacement of devices, its technical parameters will change due to various reasons. With the change of technical parameters, echo intensity was very different, even on the same target. Different wavelengths and different technical state of the weather radar often give conflicting target strength report for the same storm.This research, with the embedded control system as the control core, focus on Linux, qt platform transplantation, the x-band frequency synthesizer, zero frequency difference measurement technology, low frequency modulation signal generator, microwave amplitude stabilization components, demodulation measuring unit of video signal stability, peak power measurement units, program-controlled attenuation control unit, and IF Tracer techniques. The main research work can be summarized as follows:1. After reading many of the relevant literature and research about Radar integrated test bed at home and abroad, the author, combining user’s needs with practical problems, completed the overall program of x band weather radar.2. Choose S3C2410 embedded system, design and set up a related and complete set of controlling circuit and data acquisition circuit, as control core of the svstem.3. Transplantation of the embedded system uboot, linux2.6.15 kernel, yafs2 file system, etc4. Designed frequency synthesizer unit, amplitude stabilization circuit units, frequency measurement circuit units, intermediate frequency the instrument unit, IF Tracer unit, modulation signal unit, man-machine interface unit, etc.There is a numerous number of weather radar in our army. As various kinds of uncertain factors in using, this paper’s research achievements have achieved satisfactory result in practical application.更多还原