【摘要】：隨著經(jīng)濟的發(fā)展和社會的進步,社會各領(lǐng)域?qū)走_測距的需求越來越高。在此應(yīng)用背景下,本文基于線性調(diào)頻連續(xù)波(LFMCW)體制完成了高精度測距雷達系統(tǒng)射頻前端的設(shè)計。 首先,論文對LFMCW體制雷達的組成結(jié)構(gòu)進行了簡單介紹,詳細分析了三角波LFMCW雷達差頻法和相位法的測距原理,并導(dǎo)出了兩種方法的測距公式及測距精度。在此基礎(chǔ)上,本文確定了差頻和相位復(fù)合測距方案,計算結(jié)果表明該方案可顯著提高LFMCW雷達的測距精度。根據(jù)測距要求,本文對系統(tǒng)主要指標(biāo)進行可行性論證和定量計算。 其次,本文根據(jù)測距方案設(shè)計了雷達頻率源系統(tǒng),通過分析各種DDS和PLL組合方案優(yōu)劣,選用DDS直接激勵PLL的方式完成了L波段掃頻源設(shè)計。掃頻源雜散抑制性能良好,相噪指標(biāo)滿足-98.79dBc/Hz@10KHz,-111dBc/Hz@100KHz,-125.7dBc/Hz@1MHz.然后本文基于PE3236完成了X波段跳頻源設(shè)計,跳頻源通過應(yīng)用頻率預(yù)置技術(shù)縮短變頻鎖定時間。測試結(jié)果表明,跳頻間隔100MHz時,頻率捷變時間小于2μs,相位噪聲優(yōu)于-92dBc/Hz@100KHz,-112.3dBc/Hz@1MHz. 最后,利用所設(shè)計的頻率源完成了系統(tǒng)射頻前端的設(shè)計。測試結(jié)果與理論計算基本吻合,驗證了高精度測距系統(tǒng)的工程可實現(xiàn)性,為本課題下一階段的研究打下了良好的基礎(chǔ)。
[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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN953.2

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