伪码调相中断连续波雷达信号处理的关键技术研究

【作者】 周旭；

【导师】 谢仁宏；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2009， 硕士

【摘要】 在现代的高科技战争中,雷达的作用无可替代。其中近程侦察雷达可对地面运动目标、低空直升机等进行探测,发现目标,实现定位,并对其进行分类识别,对基地、要塞、机场等高价值目标起着保护作用。近程侦察雷达性能的提升无疑具有非常重大的意义。为了获得更低的截获概率,更强的抗干扰能力,更高的测量精度,更远的作用距离,更轻便的体积,伪码调相中断连续波雷达成为符合这些现代战争要求的首选。本文即是针对近程侦察应用下的伪码调相中断连续波雷达所做的研究。论文首先对伪码调相中断连续波雷达的信号波形进行了分析,接着研究该雷达工作环境中的噪声与杂波,选择了高斯分布的热噪声模型与幅度服从瑞利分布,功率谱服从高斯分布的杂波模型并进行了仿真。然后构建了该雷达信号处理系统的仿真模型,其模块包括:雷达回波的产生、匹配滤波、旁瓣抑制、数据重排、杂波对消和动目标检测,并给出其仿真方法与结果。在此基础上,针对伪码调相中断连续波雷达信号处理的关键技术——旁瓣抑制和杂波抑制进行了研究。它们对雷达性能的提高起着重要作用。针对13位巴克码和63位最小旁瓣电平码,讨论了基于线性规划和最小二乘的失配滤波器旁瓣抑制算法。接着针对13位巴克码,讨论了基于线性规划和最小二乘的RG-2结构的旁瓣抑制算法。通过仿真分析各算法性能,得到了有用的结论。最后分析了针对固定杂波的多脉冲对消算法和针对慢动杂波的试探法算法,通过仿真也得到了有应用意义的结论。更多还原

【Abstract】 In modern high-tech war, radar is irreplaceable. Among them the short-range surveillance radar can detect targets on the ground or at low altitude, even distinguish them. It can protect valuable targets such as fortresses, airports and so on. It is of great importance to improve the performance of the short-range surveillance radar. In order to find a radar with low possibility of interception, stronger anti-interference, better accuracy, wider range but in a smaller volume, pseudo-random-code phase-coded quasi-continuous wave radar is the first choice. Because it meets the demands of modern war. This thesis is to analyze the signal processing of pseudo-random-code phase-coded quasi-continuous wave radar for short-range surveillance.The thesis firstly analyzes the forms of the radar. And then the noise and clutter in the working environment is studied. A suitable model is chosen and simulated. Then the signal processing system of this radar is constructed. The model includes generation of received wave, matched filter, rearrangement of data, clutter-canceling, moving-target-detection. All the progress is simulated and the results are shown. After that two pivotal technologies of signal processing are discussed in detail. As for the 13-bit Barker Code and 63-bit optimal-peak-sidelobe binary codes, algorithms of linear programming and least squares are utilized to suppress the sidelobe. For the 13-bit Barker Code, filter of RG-2 structure is applied. The performance and valuable conclusions are reached. Finally a multi-cycle canceller is used for still clutter and the trying-out method for slow-moving clutter. Both algorithms are simulated and some useful results are obtained.更多还原