MIMO雷达正交波形设计与仿真实验研究
发布时间：2018-08-16 08:05
【摘要】：现代信息化战争要求有更高的战场感知能力,雷达作为一种全天候、远距离、高精度的战场感知工具,在现代信息化战争中发挥着重要的作用。多输入多输出(Multiple-input Multiple-output, MIMO)雷达以通信领域的MIMO技术为基础,依靠多天线信号发射和多天线接收目标反射信号,利用波形分集技术有效提高雷达的综合性能。本文研究MEMO雷达的正交波形设计,既是实现MIMO雷达的关键问题,也是影响MIMO雷达最终性能的关键因素。本文完成的主要工作包括：1.研究和分析MIMO雷达原理和信号处理方式,推理出MIMO雷达正交波形的设计标准,即良好的正交波形特性应具有较低的自相关旁瓣峰值和互相关峰值。2.应用频分复用原理设计正交频分复用线性调频信号(Orthogonal Frequency Division Multiplexing Linear frequency modulation, OFDM-LFM)正交波形,通过对OFDM-LFM正交波形模糊函数的分析,研究OFDM-LFM正交波形的自相关特性和互相关特性,分析表明OFDM-LFM正交波形具有良好的正交性,较高的分辨率,较大的多普勒容限。3.建立正交多相编码信号模型,以最小化自相关旁瓣峰值和互相关峰值为目标函数,利用遗传算法设计MIMO雷达正交多相编码波形,并分析其影响因素。4.分别对本文提出的MIMO雷达正交波形进行相关仿真,验证波形设计的有效性和可行性。在自相关特性仿真中,验证正交波形具有较低的自相关旁瓣峰值,并引入多普勒频率,比较多普勒效应对自相关的影响；在互相关特性仿真中,验证正交波形具有较低的互相关峰值,变化影响因素值,验证理论分析的正确性。本文围绕正交波形的设计准则,实现了OFDM-LFM和基于遗传算法的正交多相编码两种正交波形设计,仿真实验表明两种正交波形的自相关旁瓣峰值和互相关峰值均达到了设计要求,OFDM-LFM正交波形适用于搜索雷达,正交多相编码波形更适用于对多普勒变化窄、精确度要求非常高的场合,比如低速跟踪雷达等。
[Abstract]:Modern information war requires higher battlefield perception ability. Radar, as a kind of all-weather, long-distance and high-precision battlefield sensing tool, plays an important role in modern information war. The Multiple-input Multiple-Output (MIMO) radar is based on the MIMO technology in the field of communication. It relies on the multi-antenna signal transmission and the multi-antenna to receive the target reflection signal. The waveform diversity technique is used to effectively improve the comprehensive performance of the radar. In this paper, the orthogonal waveform design of MEMO radar is not only the key problem to realize MIMO radar, but also the key factor to affect the final performance of MIMO radar. The main work accomplished in this paper includes 1: 1. The principle and signal processing of MIMO radar are studied and analyzed, and the design standard of orthogonal waveform of MIMO radar is deduced, that is, the good characteristic of orthogonal waveform should have lower autocorrelation sidelobe peak and cross-correlation peak value. The orthogonal waveform of orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing Linear frequency modulation, OFDM-LFM) signal is designed by using the principle of frequency division multiplexing. By analyzing the ambiguity function of OFDM-LFM orthogonal waveform, the autocorrelation and cross-correlation characteristics of OFDM-LFM orthogonal waveform are studied. The analysis shows that OFDM-LFM quadrature waveform has good orthogonality, high resolution and large Doppler tolerance. 3. The orthogonal polyphase coded signal model is established. The objective function is to minimize the peak of autocorrelation sidelobe and cross-correlation. The orthogonal polyphase coding waveform of MIMO radar is designed by genetic algorithm, and the influencing factors are analyzed. The orthogonal waveform of MIMO radar presented in this paper is simulated to verify the validity and feasibility of the waveform design. In the autocorrelation simulation, it is verified that the orthogonal waveform has lower autocorrelation sidelobe peak, and Doppler frequency is introduced to compare the influence of Doppler effect on autocorrelation. It is verified that the orthogonal waveform has low cross-correlation peak value and variable factor value, which verifies the correctness of the theoretical analysis. In this paper, OFDM-LFM and orthogonal polyphase coding based on genetic algorithm are designed around the design criteria of orthogonal waveforms. Simulation results show that the autocorrelation sidelobe peak and cross-correlation peak of the two orthogonal waveforms meet the design requirements. The OFDM-LFM orthogonal waveforms are suitable for searching radar, and the orthogonal polyphase coded waveforms are more suitable for narrow Doppler variations. Very high accuracy requirements, such as low-speed tracking radar and so on.
【学位授予单位】：中国科学院大学(工程管理与信息技术学院)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN958
本文编号：2185399
[Abstract]:Modern information war requires higher battlefield perception ability. Radar, as a kind of all-weather, long-distance and high-precision battlefield sensing tool, plays an important role in modern information war. The Multiple-input Multiple-Output (MIMO) radar is based on the MIMO technology in the field of communication. It relies on the multi-antenna signal transmission and the multi-antenna to receive the target reflection signal. The waveform diversity technique is used to effectively improve the comprehensive performance of the radar. In this paper, the orthogonal waveform design of MEMO radar is not only the key problem to realize MIMO radar, but also the key factor to affect the final performance of MIMO radar. The main work accomplished in this paper includes 1: 1. The principle and signal processing of MIMO radar are studied and analyzed, and the design standard of orthogonal waveform of MIMO radar is deduced, that is, the good characteristic of orthogonal waveform should have lower autocorrelation sidelobe peak and cross-correlation peak value. The orthogonal waveform of orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing Linear frequency modulation, OFDM-LFM) signal is designed by using the principle of frequency division multiplexing. By analyzing the ambiguity function of OFDM-LFM orthogonal waveform, the autocorrelation and cross-correlation characteristics of OFDM-LFM orthogonal waveform are studied. The analysis shows that OFDM-LFM quadrature waveform has good orthogonality, high resolution and large Doppler tolerance. 3. The orthogonal polyphase coded signal model is established. The objective function is to minimize the peak of autocorrelation sidelobe and cross-correlation. The orthogonal polyphase coding waveform of MIMO radar is designed by genetic algorithm, and the influencing factors are analyzed. The orthogonal waveform of MIMO radar presented in this paper is simulated to verify the validity and feasibility of the waveform design. In the autocorrelation simulation, it is verified that the orthogonal waveform has lower autocorrelation sidelobe peak, and Doppler frequency is introduced to compare the influence of Doppler effect on autocorrelation. It is verified that the orthogonal waveform has low cross-correlation peak value and variable factor value, which verifies the correctness of the theoretical analysis. In this paper, OFDM-LFM and orthogonal polyphase coding based on genetic algorithm are designed around the design criteria of orthogonal waveforms. Simulation results show that the autocorrelation sidelobe peak and cross-correlation peak of the two orthogonal waveforms meet the design requirements. The OFDM-LFM orthogonal waveforms are suitable for searching radar, and the orthogonal polyphase coded waveforms are more suitable for narrow Doppler variations. Very high accuracy requirements, such as low-speed tracking radar and so on.
【学位授予单位】：中国科学院大学(工程管理与信息技术学院)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN958
【参考文献】
相关博士学位论文 前1条
1 曾建奎;MIMO雷达信号检测的若干问题研究[D];电子科技大学;2008年
相关硕士学位论文 前1条
1 崔向阳;基于二相编码信号的雷达目标检测及实现[D];西安电子科技大学;2010年
，本文编号：2185399
本文链接：https://www.wllwen.com/kejilunwen/wltx/2185399.html
