伪码调相中断连续波雷达信号处理系统的设计与实现

【作者】 刘春；

【导师】 谢仁宏；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2010， 硕士

【摘要】 在现代战争中,雷达有着不可估量的作用。近程地面侦察雷达可以对入侵的敌方步兵,坦克等地面活动目标进行全天候的监视。伪码调相中断连续波作为一种新体制,能够有效提升地面侦察雷达的性能,受到国内外广泛的关注与研究。论文首先分析伪码调相中断连续波雷达的回波信号模型,然后讨论了地面雷达的噪声和杂波环境,采用零记忆非线性变换法(ZMNL)产生了韦布尔(Weibull)分布的杂波信号,用直方图法和概率图法验证了杂波分布的正确性。在此基础上,设计实现了基于MALTAB的伪码调相中断连续波雷达信号处理系统,能够对模拟回波信号和采集的雷达回波信号进行完整的信号处理。处理模块包括匹配滤波、旁瓣抑制、距离门重排、功率谱估计、恒虚警检测。通过计算机仿真得出了满足系统性能要求、适合于硬件实现的信号处理算法,其中包括设计13位巴克码的旁瓣抑制滤波器(即RG滤波器),使其抽头加权个数大大减少,特别适合数字处理。对杂波环境中活动目标回波信号处理的结果,验证了本文设计的算法可以正确的检测到目标并得到目标的距离、速度、强度等信息。最后讨论了DSP软件设计的一般流程,设计实现了基于TMS320C6416信号处理器的信号处理软件,完成了CCS环境下的软件调试以及在信号处理硬件平台上的功能测试。外场实验结果验证了本文设计的信号处理系统的有效性及正确性。更多还原

【Abstract】 In modern wars, radar play a immeasurable role,short-range surveillance radar can invasion of infantry.tank and other ground moving target around the clock. Pseudorandom Code interrupted continuous wave system can effectively improve the performance of ground surveillance radar. The Pseudorandom Code interrupted continuous wave, as a new system, can improve the performance of ground surveillance radar,and widespread concern and research.Firstly the paper analyzes the echo model of Pseudorandom Code interrupted continuous wave radar and discusses the noise and clutter in the working environment. Then a clutter signal of Weibull distribution is simulated by MALTAB using zero memory nonlinear transformation (ZMNL), and the correctness of clutter distribution is verified with the histogram and probability distribution diagram. On that basis, the Pseudorandom Code interrupted continuous wave radar signal processing system is designed and implemented by MALTAB that able to process of the simulation echo signal and radar signal. The processing module includes pulse compression, rearrangement of the data, power spectrum estimation and CFAR. Signal processing algorithm is obtained by computer simulation, which satisfies the requirements of the system and is suitable for hardware implementation. The algorithm includes the design of sidelobe suppression filter of 13 Barker code that is especially suitable for digital processing. The processing results of the echo signal in clutter verify that the algorithm designed in this paper can detect the target and get the distance, speed, strength and other information about it.In the end of the paper, flow chart of the software design on DSP in the system design will be introduced. Then design the DSP software of the signal processing based on TMS320C6416 and make test after the algorithm and performance evaluation are completed in the hardware platform. The experimental results verify the effectiveness and correctness of the algorithm.更多还原