高速移动平台下高速率雷达方式通信方法研究

发布时间：2018-04-20 17:36

本文选题：通信系统 + 雷达方式通信　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：随着科技的发展和进步，探究多种电子设备、多种信号处理技术的一体化设计，采用相关技术去除高速环境下多普勒频移的影响，实现高速移动平台下的实时高速率雷达方式通信已成为研究热点。在雷达方式通信可行性的基础上，借用雷达系统实现通信信息的加载，使得一体化系统既能够实现对目标的探测和定位，又能够实现信息的交互。利用OFDM技术的高频带利用率实现信息的高速率传输，然而，移动平台的高速运动产生较大的多普勒频移，导致信号幅度衰减、相位偏移，并引起载波间干扰。通过对双差分技术的分析，虽然双差分技术对信噪比要求高，但该技术可有效去除多普勒频移的影响，因此提出将双差分技术与OFDM技术结合，实现高速移动平台下的信息实时高速率传输。通过对OFDM技术的分析，以及相关算法性能的比较和验证，采用双差分技术去除多普勒频移的影响实现系统的载波同步，采用Park算法实现系统的定时同步、采用Nyquist脉冲成形技术降低系统的峰均比。当多普勒频移确定时，基带数字调制方式编码进制越高，采用双差分技术的OFDM系统所需信噪比越大，但高进制编码的OFDM系统频带利用率更高，在带宽相同的情况下，信息的传输速率较高。将通过双差分处理的OFDM信号加载到雷达信号上，以S波段、X波段、K波段雷达通信系统为例，当载波间隔远远大于多普勒频移时，系统自身能够实现信息传输。但在某些特殊应用场合下，移动平台的运动速度可达到第一宇宙速度，产生较大的多普勒频移导致系统性能恶化；当系统运动速度达到第一宇宙速度，多普勒频移确定时，在信噪比满足要求的情况下，采用双差分技术的雷达通信系统能够有效去除较大多普勒频移的影响，且具有较高的信息传输速率，能够实现信息的实时高速率传输。雷达系统与通信系统、OFDM技术与双差分技术的结合，，能够有效实现高速移动平台下的实时高速率雷达方式通信。
[Abstract]:With the development and progress of science and technology, the integrated design of various electronic equipment and signal processing technology is explored, and the influence of Doppler frequency shift in high speed environment is removed by using related technology. The realization of real-time high-rate radar communication on high-speed mobile platform has become a research hotspot. On the basis of the feasibility of radar communication, the radar system is used to realize the loading of communication information, so that the integrated system can not only realize the detection and location of the target, but also realize the information exchange. Using the high frequency band utilization of OFDM technology to realize high rate information transmission, however, the high speed motion of mobile platform produces large Doppler frequency shift, resulting in signal amplitude attenuation, phase offset, and inter-carrier interference. Through the analysis of the double difference technique, although the double difference technique requires high SNR, it can effectively remove the influence of Doppler frequency shift. Therefore, the combination of dual differential technique and OFDM technology is proposed. Real-time and high-rate information transmission on high-speed mobile platform is realized. Through the analysis of OFDM technology and the comparison and verification of the performance of related algorithms, the carrier synchronization of the system is realized by using double differential technique to remove the influence of Doppler frequency shift, and the timing synchronization of the system is realized by using Park algorithm. The peak to average ratio (PAPR) of the system is reduced by Nyquist pulse forming technology. When the Doppler frequency shift is determined, the higher the baseband digital modulation code is, the greater the signal-to-noise ratio (SNR) is required for the OFDM system with double difference technique, but the higher the frequency band efficiency of the high-band coded OFDM system is, the higher the bandwidth is when the bandwidth is the same. The transmission rate of information is high. The OFDM signal processed by double difference is loaded into the radar signal. Taking S-band X band radar communication system as an example, when the carrier interval is far larger than the Doppler frequency shift, the system can realize the information transmission itself. However, in some special applications, the moving speed of the mobile platform can reach the first cosmic velocity, which results in the deterioration of the system performance due to the large Doppler frequency shift, and when the system motion velocity reaches the first cosmic velocity, the Doppler frequency shift is determined. Under the condition that the SNR can meet the requirement, the radar communication system with double differential technique can effectively remove the influence of large Doppler frequency shift, and has higher information transmission rate, and can realize the real-time high rate transmission of information. The combination of OFDM technology and dual differential technology of radar system and communication system can effectively realize the real-time high rate radar mode communication under high-speed mobile platform.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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