无载波超宽带雷达信号检测算法研究
发布时间：2019-06-11 13:45
【摘要】：无载波超宽带雷达以其具有高距离分辨率、强抗干扰性、强穿透性等优势,在军事和民用方面具有很好的实际应用价值。本文在分析无载波超宽带雷达信号模型的基础上,对其信号检测技术进行了深入的研究。论文的主要研究工作如下:1.针对无载波超宽带雷达信号建模,详细分析了雷达系统的发射波形和目标的散射模型,并结合杂波起伏模型,给出了无载波超宽带雷达的目标回波模型。2.研究分析了基于Hough变换的无载波超宽带雷达信号检测算法。针对传统的Hough变换信号检测算法难以解决检测性能与算法运算量之间的矛盾,利用无载波超宽带雷达目标的距离扩展特性提出了一种改进的基于Hough变换的信号检测算法。仿真实验表明,改进后算法在性能损失不大的情况下,算法的运算时间降低约45%。3.研究了存在距离走动情况下多次脉冲回波的脉间积累检测问题。从目标回波的特性以及目标的运动特征入手,提出了两种基于运动补偿的无载波超宽带雷达滑窗检测算法。前者根据相邻两次目标回波包络的相似性通过互相关处理实现多次回波的包络对齐;后者,通过滑窗积累及动态聚类算法估计目标的参数信息并进行运动补偿。仿真结果验证了这两种检测方法的可行性。4.研究了基于动态规划(Dynamic Programming,DP)的无载波超宽带雷达检测前跟踪算法(Track Before Detection,TBD)。针对传统的DP-TBD算法在处理过程中所出现的能量扩散效应,通过数据预处理和方向加权算法提出了一种改进的DP-TBD算法。仿真结果表明改进后的算法不仅能有效剔除能量扩散效应所产生的虚假航迹,而且还能提高算法的检测性能及运算效率。同时,从检测性能和算法运算量两个方面对比分析了基于改进的Hough变换检测算法、基于运动补偿的滑窗检测算法以及基于改进的动态规划检测前跟踪算法。
[Abstract]:Carrier-free ultra-broadband radar has good practical application value in military and civil fields because of its advantages of high range resolution, strong anti-interference, strong penetration and so on. Based on the analysis of the signal model of carrier-free UWB radar, the signal detection technology is deeply studied in this paper. The main research work of this paper is as follows: 1. Aiming at the modeling of ultra-broadband radar signal without carrier, the transmitting waveform of radar system and the scattering model of target are analyzed in detail, and the target echo model of carrier-free ultra-broadband radar is given. 2. The signal detection algorithm of carrier-free UWB radar based on Hough transform is studied and analyzed. In view of the fact that the traditional Hough transform signal detection algorithm is difficult to solve the contradiction between the detection performance and the computational complexity of the algorithm, an improved signal detection algorithm based on Hough transform is proposed by using the range spread characteristics of ultra-broadband radar targets without carrier. The simulation results show that the operation time of the improved algorithm is reduced by about 45% when the performance loss is small. The problem of inter-pulse accumulation detection of multiple pulse echoes in the presence of range walking is studied. Based on the characteristics of target echo and the motion characteristics of the target, two sliding window detection algorithms based on motion compensation for ultra-broadband radar without carrier are proposed. According to the similarity of echo envelope of two adjacent targets, the former realizes the envelope alignment of multiple echoes by cross-correlation processing, while the latter estimates the parameter information of the target through sliding window accumulation and dynamic clustering algorithm and compensates for motion. The simulation results verify the feasibility of the two detection methods. 4. The pre-detection tracking algorithm (Track Before Detection,TBD for carrier-free UWB radar based on dynamic programming (Dynamic Programming,DP) is studied. Aiming at the energy diffusion effect of the traditional DP-TBD algorithm in the process of processing, an improved DP-TBD algorithm is proposed by data preprocessing and direction weighting algorithm. The simulation results show that the improved algorithm can not only effectively eliminate the false tracks caused by the energy diffusion effect, but also improve the detection performance and operation efficiency of the algorithm. At the same time, the improved Hough transform detection algorithm, sliding window detection algorithm based on motion compensation and pre-detection tracking algorithm based on improved dynamic programming are compared and analyzed from two aspects of detection performance and algorithm computation.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
本文编号：2497232
[Abstract]:Carrier-free ultra-broadband radar has good practical application value in military and civil fields because of its advantages of high range resolution, strong anti-interference, strong penetration and so on. Based on the analysis of the signal model of carrier-free UWB radar, the signal detection technology is deeply studied in this paper. The main research work of this paper is as follows: 1. Aiming at the modeling of ultra-broadband radar signal without carrier, the transmitting waveform of radar system and the scattering model of target are analyzed in detail, and the target echo model of carrier-free ultra-broadband radar is given. 2. The signal detection algorithm of carrier-free UWB radar based on Hough transform is studied and analyzed. In view of the fact that the traditional Hough transform signal detection algorithm is difficult to solve the contradiction between the detection performance and the computational complexity of the algorithm, an improved signal detection algorithm based on Hough transform is proposed by using the range spread characteristics of ultra-broadband radar targets without carrier. The simulation results show that the operation time of the improved algorithm is reduced by about 45% when the performance loss is small. The problem of inter-pulse accumulation detection of multiple pulse echoes in the presence of range walking is studied. Based on the characteristics of target echo and the motion characteristics of the target, two sliding window detection algorithms based on motion compensation for ultra-broadband radar without carrier are proposed. According to the similarity of echo envelope of two adjacent targets, the former realizes the envelope alignment of multiple echoes by cross-correlation processing, while the latter estimates the parameter information of the target through sliding window accumulation and dynamic clustering algorithm and compensates for motion. The simulation results verify the feasibility of the two detection methods. 4. The pre-detection tracking algorithm (Track Before Detection,TBD for carrier-free UWB radar based on dynamic programming (Dynamic Programming,DP) is studied. Aiming at the energy diffusion effect of the traditional DP-TBD algorithm in the process of processing, an improved DP-TBD algorithm is proposed by data preprocessing and direction weighting algorithm. The simulation results show that the improved algorithm can not only effectively eliminate the false tracks caused by the energy diffusion effect, but also improve the detection performance and operation efficiency of the algorithm. At the same time, the improved Hough transform detection algorithm, sliding window detection algorithm based on motion compensation and pre-detection tracking algorithm based on improved dynamic programming are compared and analyzed from two aspects of detection performance and algorithm computation.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51
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