星载超宽带雷达信号参数测量方法与DSP软件实现

发布时间：2018-03-23 03:33

本文选题：星载超宽带雷达　切入点：调制类型识别　出处：《北京理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：在复杂密集电磁环境下,为了适应现在和未来的雷达情报侦察系统发展需求,实时高精度测量信噪比低、脉内起伏大的星载超宽带雷达信号成为了国内外的热点研究。本课题基于数字信道化技术来实现快速、高精度的星载超宽带雷达信号的参数测量。本文首先介绍了星载超宽带雷达信号的定义以及常见的信号调制类型,包括脉冲内部的频率调制类型和脉冲间的载频调制类型,并针对星载超宽带雷达信号的特性总结了其测量中的难点。其次,根据信号的时频响应规律,提出了星载超宽带雷达信号的调制类型识别与参数测量的方法,包括脉内调制类型的识别,频域参数的测量以及辐射源参数的提取,并针对星载超宽带雷达信号的特点,采用了数字信道化的技术,以及对测量结果进行了一定的后期处理来获得更准确的测量效果,包括针对分裂脉冲测量结果的合并处理和多辐射源情况下的信号分离筛选。接着,根据现有的芯片发展水平以及所需的设计要求给出了一种星载超宽带雷达信号处理系统的实现方案,并详细介绍了DSP芯片的软件流程设计以及程序结构设计。针对该设计进行了三方面的可行性论证,其结果表明所设计的DSP程序可以满足传输带宽要求、存储能力要求以及处理实时性要求。最后针对该系统的主要技术指标和处理实时性进行了测试分析从而验证系统的性能。
[Abstract]:In the complex and dense electromagnetic environment, in order to meet the needs of the present and future radar intelligence reconnaissance system, the signal to noise ratio (SNR) of real-time high-precision measurement is low. Spaceborne UWB radar signal with large fluctuation in the pulse has become a hot research at home and abroad. This subject is based on digital channelization technology to achieve fast. This paper first introduces the definition of spaceborne UWB radar signal and the common signal modulation types, including the frequency modulation type inside the pulse and the carrier frequency modulation type between pulses. According to the characteristics of spaceborne UWB radar signal, the difficulties in measurement are summarized. Secondly, according to the time-frequency response law of the signal, the modulation type identification and parameter measurement method of the spaceborne UWB radar signal are proposed. It includes the identification of intra-pulse modulation type, the measurement of frequency domain parameters and the extraction of emitter parameters. According to the characteristics of spaceborne UWB radar signal, the digital channelization technique is adopted. And some post-processing is carried out to obtain more accurate measurement results, including combination processing of split pulse measurement results and signal separation and screening in the case of multiple emitter sources. According to the current chip development level and the required design requirements, a scheme of signal processing system for spaceborne UWB radar is presented. The software flow design and program structure design of DSP chip are introduced in detail. The feasibility of the design is demonstrated in three aspects. The results show that the designed DSP program can meet the requirements of transmission bandwidth. Finally, the main technical specifications and processing real-time of the system are tested and analyzed to verify the performance of the system.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN957.51

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