要实现目标距离高分辨率成像、目标识别等功能需要高分辨率雷达，但高分辨率雷达信号具有大的瞬时带宽，因此其系统硬件实现难度非常高。以频率步进技术为代表的通过对多个波段回波信号进行相干合成以获取高分辨率的技术具有可以有效降低系统瞬时带宽，容易实现超大带宽等优点，因此具有广阔的发展前景。本论文对多波段雷达信号合成技术进行了深入的研究，主要研究工作如下：1）研究了线性调频信号、脉冲压缩、频率步进信号的特性及其成像原理，并通过仿真对其特性进行了验证。2）给出了一种时域带宽合成算法，该算法通过上采样、频移、相位补偿、时移和信号叠加等五个步骤将两波段线性调频信号回波信号合成为一个宽带线性调频信号，然后对合成后信号进行脉冲压缩成像。仿真结果表明，通过该时域带宽合成算法可以成功地将两波段回波信号进行相干合成，并且合成后的宽带信号可以实现更高的距离分辨率。 9880
关键词： 线性调频， 脉冲压缩， 频率步进， 多波段融合， 相干合成， 高距
离分辨率， 雷达成像 Title Synthetic Technique of Multiple Independent Band Radar Signals
Abstract
In order to achieve a high-resolution target imaging and recognition, a
high resolution radar is needed. However, a high resolution radar requires
a ultra-wide bandwidth, it is very difficult to design a radar hardware
with a very high bandwidth. The method of synthesizing multiple independent
band echo signals to obtain high resolution has low hardware requirements
and can achieve a ultra-wide bandwidth，thus it promises a broad developing
future for high resolution radars in the future, here stepped frequency
radar is a typical example. This paper focuses on the study of the synthetic
technology for multiple-band radar signals, the main work is as follow:
1) imaging principles of linear frequency modulation(LFM) signal, pulse
compression and stepped frequency waveform(SFW) are studied, and
simulation results verify these imaging principles.2) A time-domain
synthetic bandwidth algorithm is given. This synthetic algorithm includes
five steps of up-sampling、frequency shifting、phase compensation、time
shifting and signal superimposing to achieve a ultra-wide bandwidth LFM
signal. Simulations show: two sub-band LFM signals can be coherently
synthesized as a wide-bandwidth signal and the range resolution of this
synthesized signal is high-resolution.
Keywords: LFM， pulse compression， SF， multi-band fusion， coherent
synthesis, high range resolution， radar imaging 目 次
1 绪论 1
1.1 课题研究背景及概述 1
1.2 文章主要内容和结构 3
2 线性调频信号、脉冲压缩和频率步进技术 4
2.1 线性调频信号 4
2.2 脉冲压缩 9
2.3 频率步进信号 . 17
2.4 调频步进信号 . 20
2.5 本章小结 . 22
3 时域带宽合成 . 23
3.1 带宽合成概述 . 23
3.2 时域带宽合成原理介绍 . 23
3.3 时域带宽合成仿真 . 32
3.4 本章小结 . 34
4. 合成宽带信号距离成像 35
4.1 合成宽带信号距离成像概述 . 35
4.2 合成宽带信号距离成像仿真 . 36
4.3 本章小结 . 39
结论 40
致谢 41 多个独立波段雷达信号合成技术研究:http://www.751com.cn/tongxin/lunwen_8761.html