高精度雷达测距系统射频前端关键技术研究
发布时间：2018-11-04 21:07
【摘要】：随着经济的发展和社会的进步,社会各领域对雷达测距的需求越来越高。在此应用背景下,本文基于线性调频连续波(LFMCW)体制完成了高精度测距雷达系统射频前端的设计。 首先,论文对LFMCW体制雷达的组成结构进行了简单介绍,详细分析了三角波LFMCW雷达差频法和相位法的测距原理,并导出了两种方法的测距公式及测距精度。在此基础上,本文确定了差频和相位复合测距方案,计算结果表明该方案可显著提高LFMCW雷达的测距精度。根据测距要求,本文对系统主要指标进行可行性论证和定量计算。 其次,本文根据测距方案设计了雷达频率源系统,通过分析各种DDS和PLL组合方案优劣,选用DDS直接激励PLL的方式完成了L波段扫频源设计。扫频源杂散抑制性能良好,相噪指标满足-98.79dBc/Hz@10KHz,-111dBc/Hz@100KHz,-125.7dBc/Hz@1MHz.然后本文基于PE3236完成了X波段跳频源设计,跳频源通过应用频率预置技术缩短变频锁定时间。测试结果表明,跳频间隔100MHz时,频率捷变时间小于2μs,相位噪声优于-92dBc/Hz@100KHz,-112.3dBc/Hz@1MHz. 最后,利用所设计的频率源完成了系统射频前端的设计。测试结果与理论计算基本吻合,验证了高精度测距系统的工程可实现性,为本课题下一阶段的研究打下了良好的基础。
[Abstract]:With the development of economy and the progress of society, the demand of radar ranging in all fields of society is more and more high. In this application background, the RF front end of high precision ranging radar system is designed based on linear frequency modulated continuous wave (LFMCW) system. Firstly, the structure of LFMCW radar is briefly introduced, and the principle of differential frequency method and phase method of triangular wave LFMCW radar is analyzed in detail, and the ranging formulas and ranging accuracy of the two methods are derived. On the basis of this, the differential frequency and phase compound ranging scheme is determined. The calculation results show that this scheme can improve the ranging accuracy of LFMCW radar significantly. According to the requirements of ranging, the feasibility and quantitative calculation of the main indexes of the system are demonstrated in this paper. Secondly, the radar frequency source system is designed according to the ranging scheme. By analyzing the advantages and disadvantages of various combination schemes of DDS and PLL, the L-band sweep frequency source is designed by using DDS to directly excite PLL. The index of phase noise satisfied -98.79dBc / Hz-10KHz-111dBc / Hz-100KHz-125.7dBc / Hz-125.7dBc / Hz-1 MHz. Then based on PE3236, the design of X-band frequency hopping source is completed. Frequency hopping technology is used to shorten the locking time of frequency conversion. The test results show that the frequency agility time is less than 2 渭 s and the phase noise is better than -92 dBc / Hzr 100KHz / Hzr / HzBc / HzR 1MHz. when the frequency hopping interval is 100MHz, the frequency switching time is less than 2 渭 s. Finally, the RF front end of the system is designed by using the designed frequency source. The test results are in good agreement with the theoretical calculation, which verifies the engineering realizability of the high-precision ranging system, and lays a good foundation for the next stage of the research.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN953.2
本文编号：2311139
[Abstract]:With the development of economy and the progress of society, the demand of radar ranging in all fields of society is more and more high. In this application background, the RF front end of high precision ranging radar system is designed based on linear frequency modulated continuous wave (LFMCW) system. Firstly, the structure of LFMCW radar is briefly introduced, and the principle of differential frequency method and phase method of triangular wave LFMCW radar is analyzed in detail, and the ranging formulas and ranging accuracy of the two methods are derived. On the basis of this, the differential frequency and phase compound ranging scheme is determined. The calculation results show that this scheme can improve the ranging accuracy of LFMCW radar significantly. According to the requirements of ranging, the feasibility and quantitative calculation of the main indexes of the system are demonstrated in this paper. Secondly, the radar frequency source system is designed according to the ranging scheme. By analyzing the advantages and disadvantages of various combination schemes of DDS and PLL, the L-band sweep frequency source is designed by using DDS to directly excite PLL. The index of phase noise satisfied -98.79dBc / Hz-10KHz-111dBc / Hz-100KHz-125.7dBc / Hz-125.7dBc / Hz-1 MHz. Then based on PE3236, the design of X-band frequency hopping source is completed. Frequency hopping technology is used to shorten the locking time of frequency conversion. The test results show that the frequency agility time is less than 2 渭 s and the phase noise is better than -92 dBc / Hzr 100KHz / Hzr / HzBc / HzR 1MHz. when the frequency hopping interval is 100MHz, the frequency switching time is less than 2 渭 s. Finally, the RF front end of the system is designed by using the designed frequency source. The test results are in good agreement with the theoretical calculation, which verifies the engineering realizability of the high-precision ranging system, and lays a good foundation for the next stage of the research.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN953.2
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